CN117971951B - Heterogeneous registry-oriented digital object metadata interoperation method, device, equipment and medium - Google Patents
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Abstract
The application provides a digital object metadata interoperation method, device, equipment and medium facing to a heterogeneous registry, wherein the method comprises the following steps: registering digital object metadata with a digital object registry system in accordance with a digital object metadata schema, the digital object metadata schema characterizing metadata elements and constraint rules; determining the mapping relation between different digital object metadata modes according to the functions or semantics of each metadata element of the digital object metadata modes; and constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol. In this manner, interoperability of digital object metadata is achieved in complex environments of heterogeneous multisource.
Description
Technical Field
The present application relates to the field of digital object technologies, and in particular, to a method, an apparatus, a device, and a medium for interoperating metadata of a digital object oriented to a heterogeneous registry.
Background
In the big data age, with the rapid growth of data volumes, big data technology architecture will come with a major technological revolution from "computing centric" to "data centric". The technical route for realizing the data interconnection and interworking by taking the data as the center is a digital object architecture proposed by Robert Kann, and the existing global Internet is used for cooperatively working, uniformly managing and eliminating a data chimney and a data island among the systems by distributing the information systems in different regions, different architectures and different modes so as to realize the interconnection and interworking of heterogeneous, off-site and off-host data.
Digital object metadata is a structured description of the content and attributes of a data asset for discovery, evaluation, and management of digital objects. Digital object metadata interoperability is the basis for discoverable, acquirable, understandable and interoperable data resources across domain collapse sites in a digital object architecture. Because the environment of digital object metadata interoperability is multi-source heterogeneous, how to implement digital object metadata interoperability in complex environments of multi-source heterogeneous is a technical problem to be solved.
Disclosure of Invention
In view of the above, embodiments of the present application provide a heterogeneous registry-oriented digital object metadata interoperation method, apparatus, device, and medium to overcome or at least partially solve the above-described problems.
In a first aspect of an embodiment of the present application, a method for interoperating digital object metadata for a heterogeneous registry is disclosed, the method comprising:
Registering digital object metadata with a digital object registry system in accordance with a digital object metadata schema, the digital object metadata schema characterizing metadata elements and constraint rules;
Determining the mapping relation between different digital object metadata modes according to the functions or semantics of each metadata element of the digital object metadata modes;
and constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol.
Optionally, the digital object metadata schema includes core metadata and extension metadata; the digital object metadata schema is determined by:
determining core metadata according to metadata standards and functions of digital object metadata, wherein the core metadata comprises content information, data attributes and relation information;
And expanding the core metadata according to the field characteristics to obtain the expanded metadata.
Optionally, determining the mapping relationship between different digital object metadata modes according to the functions or semantics of the metadata elements of the digital object metadata modes includes:
determining a first metadata element in a first digital object metadata schema;
Querying a second metadata element having the same function or semantics as the first metadata element in a second digital object metadata schema;
a mapping relationship is established between the first metadata element and the second metadata element.
Optionally, constructing an interconnection relationship of different digital object registry systems according to the mapping relationship and the digital object interface protocol, including:
determining whether the digital object registry system belongs to an unexpected task, wherein the unexpected task refers to the digital object registry system which does not meet the direct interaction requirement;
Under the condition that the digital object registry system belongs to an unexpected task, constructing point-to-point interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol, wherein the interconnection relations are connected through a metadata bridge;
and constructing hierarchical interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol under the condition that the digital object registry systems do not belong to unexpected tasks.
Optionally, in the case that the digital object registry system does not belong to an unexpected task, constructing a hierarchical interconnection relationship between different digital object registry systems according to the mapping relationship and the digital object interface protocol, including:
Determining a central digital object registry system and a lower level digital object registry system of the central digital object registry system, the central digital object registry system storing universal digital object metadata schemas and digital object metadata schemas for each lower level digital object registry system;
A metadata bridge is established between the central digital object registry system and each of the lower digital object registry systems based on a mapping relationship between the universal digital object metadata schema of the central digital object registry system and the digital object metadata schema of each of the lower digital object registry systems, and the digital object interface protocol.
Optionally, in the case where there are multiple central digital object registry systems, the method further comprises:
Establishing a metadata bridge between each two central digital object registry systems; or alternatively, the first and second heat exchangers may be,
Determining a root digital object registry system, and taking each central digital object registry system as a child node of the root digital object registry system, and establishing a metadata bridge between the root digital object registry system and each central digital object registry system.
Optionally, the method further comprises:
Each lower-level digital object registry periodically reports the digital object metadata to the central digital object registry system, or each lower-level digital object registry reports the changed digital object metadata to the central digital object registry system when the digital object metadata changes;
each of the lower level digital object registry systems obtains digital object metadata for other digital object registry systems by initiating a data acquisition request to the central digital object registry system.
In a second aspect of the embodiments of the present application, a digital object metadata interoperation device for heterogeneous registries is disclosed, the device comprising:
A first registration module for registering digital object metadata with a digital object registry system in accordance with a digital object metadata schema, the digital object metadata schema characterizing metadata elements and constraint rules;
A first determining module, configured to determine a mapping relationship between different digital object metadata modes according to a function or semantics of each metadata element of the digital object metadata modes;
And the first construction module is used for constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol.
In a third aspect of the embodiment of the present application, an electronic device is disclosed, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the steps of the digital object metadata interoperation method for heterogeneous registries according to the first aspect of the embodiment of the present application are implemented when the processor executes the computer program.
In a fourth aspect of the embodiments of the present application, a computer readable storage medium is disclosed, on which a computer program is stored, which when executed by a processor implements the steps of the digital object metadata interoperation method for heterogeneous registries according to the first aspect of the embodiments of the present application.
The embodiment of the application has the following advantages:
In an embodiment of the application, digital object metadata is registered to a digital object registry system according to a digital object metadata schema, the digital object metadata schema characterizing metadata elements and constraint rules; determining the mapping relation between different digital object metadata modes according to the functions or semantics of each metadata element of the digital object metadata modes; and constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol.
Because the digital object metadata is registered in the digital object registry system according to the digital object metadata mode, the multiplexing effect of the digital object metadata is improved; and, according to the mapping relation between the digital object metadata modes and the interconnection relation of different digital object registry systems constructed by the digital object interface protocol, the interoperability among different digital object registry systems can be realized. In this manner, interoperability of digital object metadata is achieved in complex environments of heterogeneous multisource.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a method for interoperating digital object metadata for a heterogeneous registry according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a digital object metadata schema provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a point-to-point interconnection relationship provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of a hierarchical interconnection relationship provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of a distributed converged digital object metadata interconnection provided by an embodiment of the present application;
FIG. 6 is a schematic diagram of a tree-shaped aggregated digital object metadata interconnect provided by an embodiment of the present application;
FIG. 7 is a schematic diagram of a digital object metadata interoperation device oriented to a heterogeneous registry according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application will be readily apparent, a more particular description of embodiments of the application will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a digital object metadata interoperation method for heterogeneous registries according to an embodiment of the present application. As shown in fig. 1, a digital object metadata interoperation method facing to a heterogeneous registry according to an embodiment of the present application may include steps S110 to S130:
Step S110: digital object metadata is registered with a digital object registry system in accordance with a digital object metadata schema that characterizes metadata elements and constraint rules.
In embodiments of the present application, digital object metadata refers to a structured description of the content and attributes of a data asset. Metadata elements in the digital object metadata schema are constituent data of the digital object metadata, e.g., identifiers, names, subjects, etc., all belong to metadata elements whose settings are needed to enable the digital object metadata to accurately describe the data resources. Constraint rules refer to rules that are followed when setting metadata elements in order to enable digital object metadata to accurately describe data resources to support high accuracy retrieval.
Digital object metadata patterns (i.e., expressions and hierarchies) for data resources in different fields (i.e., different types) may be different, and digital object metadata models corresponding to data resources having similar characteristics may be similar. For example, the digital object metadata schema for the medical domain data asset and the digital object metadata schema for the educational domain data asset are different. In order to achieve multiplexing of digital object metadata as much as possible, when a digital object registry system is constructed, digital object metadata is registered into the digital object registry system following a digital object metadata schema.
Step S120: and determining the mapping relation between different digital object metadata modes according to the functions or semantics of each metadata element of the digital object metadata modes.
In the embodiment of the application, because the digital object metadata modes of the data resources in different fields have the differences of expression and hierarchical structures, the mapping relation is established between different digital object metadata so as to realize the conversion of heterogeneous digital object metadata. Specifically, for metadata elements of one digital object metadata mode, metadata elements with consistent functions or semantics are found in another digital object metadata mode or modes, a mapping relation is established, and further conversion of heterogeneous digital object metadata is achieved based on the mapping relation.
Wherein, establishing a mapping relation between the digital object metadata comprises: one-to-one, many-to-many, etc., digital object metadata schema mappings. The one-to-one digital object metadata mode mapping relation realizes the mutual mapping between two digital object metadata modes and can be used for the digital object metadata interconnection scene of a point-to-point digital object registry system. The mapping relation of the digital object metadata modes of the multiple-to-one digital object metadata modes is that a digital object metadata mode (such as a core metadata mode) with strong universality is selected as a center, and other digital object metadata modes are mapped to the center, so that the mutual mapping of the digital object metadata modes of a plurality of digital object registry systems is realized. The method is suitable for the scene of federation interconnection of the digital object registry system.
Step S130: and constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol.
In the embodiment of the application, the interconnection relation of different digital object registry systems refers to the physical connection of the digital object registry systems for interactive sharing of the metadata of the digital objects. The digital object metadata is distributed among different digital object registry systems, each of which may be heterogeneous. Because the digital object registry systems all support digital object interface protocols (Digital Object Interface Protocol, DOIP), mapping relations exist between the digital object metadata modes of different digital object registry systems, and therefore interconnection relations of different digital object registry systems are constructed according to the mapping relations and the digital object interface protocols, and interoperation of heterogeneous digital object metadata among different digital object registry systems is achieved. In this manner, interoperability of digital object metadata is achieved in complex environments of heterogeneous multisource.
In an alternative embodiment, the digital object metadata schema includes core metadata and extension metadata; the digital object metadata schema is determined by the following steps A1 and A2:
step A1: core metadata including content information, data attributes, and relationship information is determined based on metadata criteria and functions of the digital object metadata.
Step A2: and expanding the core metadata according to the field characteristics to obtain the expanded metadata.
In the embodiment of the application, the core metadata is the description of the public attribute of the digital object of the data resource, is applicable to all the digital objects of the data resource, and the extended metadata is the description of the business/field category characteristics of the digital object and is the supplement of the core metadata. In making the digital object metadata schema, a full set of core metadata should be included and derived and extended based on the core metadata. When the core metadata cannot meet the requirements of the service data resource description, the extension metadata is added to supplement the data resource description. FIG. 2 is a schematic diagram of a digital object metadata schema provided in an embodiment of the present application, wherein core metadata is composed of content information, data attributes and management information, the content information describing names, classifications, summaries, keywords, time domain information of data resources; the data attribute describes the data characteristics of the data resource such as the format, the data quantity and the like; the management information describes maintenance management information of the data resource, including source information, release information, status information, and the like.
In specific implementation, according to the metadata standard and the functions of the digital object metadata, core metadata is determined, and expansion is performed on the basis of the core metadata to obtain expansion metadata. The metadata standard refers to a principle that the metadata standard is generally used at present, and the establishment of the metadata mode of the digital object is obtained by analyzing the characteristics of the existing metadata standard so as to provide theoretical guidance for formulating the metadata mode of the digital object.
Specifically, the principle of creation of a digital object metadata schema should follow the following 4 points: 1) Investigation should be performed from four aspects of the digital object issuer, manager, user, and digital object itself, with the digital object issuer, manager, and user requirements being weighed against the characteristics of the digital object itself. 2) Care should be taken to ensure that the digital object's publishing registration process is relatively simple and easy to master. Pursuing simple ease of use may result in inaccurate indexing, reducing the ability to discover data, and thus, design of digital object metadata schemas may take into account the tradeoff of simple ease of use and accurate discovery. 3) Because of the multi-source heterogeneity of data resources, the characteristics of digital objects packaged by various data resources are different, and various digital objects cannot be comprehensively described by using only one digital object metadata mode, and the design and definition of corresponding metadata elements need to be determined according to specific service requirements and digital object types. 4) Consider the enhancement of interoperability of digital object metadata between heterogeneous digital object registry systems with the ability to be conveniently converted to digital object metadata commonly used by other digital object registry systems. Further, the design of the metadata schema for the digital object requires consideration of semantic definitions of metadata elements, metadata structures, and conversion of more popular widely supported metadata standards.
The digital object metadata functions include: data description, data management, data discovery, data sharing. Wherein, the data description refers to information describing the content, quality, search times, creator, creation date, format, classification and the like of the data resource. Metadata should more fully reflect the full view of the digital object. The support user can have basic knowledge and knowledge of the digital object itself without having to browse it, thereby deciding on the choice of search results. In addition, whether different digital objects can be distinguished accurately is also an important reference for measuring descriptive capabilities. Data management refers to the management of metadata versions, storage, maintenance and the like of a registry system by means of digital object files, indexes and catalogs established by digital object metadata. The data discovery means that the digital objects are effectively organized through the metadata of the digital objects, the association among the digital objects is established, a multi-level and multi-path retrieval system is established, the complexity of retrieval is simplified for users, and the retrieval accuracy and recall rate are improved, so that the users can find the really needed data resources conveniently and rapidly. Data sharing refers to the realization of data resource cross-domain and site collapse sharing based on the interoperability of digital object metadata.
The digital object core metadata consists of metadata elements and metadata entities, and comprises 10 metadata entities and 44 metadata elements, wherein 4 metadata entities are selected, 6 metadata entities are selected, 13 metadata elements are selected, 9 metadata elements are selected as condition candidates, and 22 metadata elements are selected. Specifically, the core metadata may be divided into: the digital object identification is a digital object globally unique identifier, the content information is used for describing the content attribute of the digital object, the data attribute is used for describing the storage carrier attribute of the digital object, and the management information is used for describing the management attribute of the digital object.
The content information specifically includes: language, character set, category, keyword, abstract, time range information, and geographic range information. Wherein, the category comprises category names and classification standards; the time range information includes: single time, start time, end time, time description; the geographical area information includes: place name, country/region, detailed address, region boundary, coordinate system.
The data attribute specifically includes: format, data size, and number of records. The management information specifically includes: metadata identification, release date, release side, metadata latest modification date, metadata maintenance side, digital object registry system identification, metadata standard information, metadata security restriction hierarchy, last update time, state, expiration date, update frequency, maintenance side, data log, metadata mode, responsible side. Wherein the metadata schema includes: metadata language, metadata character set, schema name, schema version, schema creator. The responsible party comprises: responsible party name, contacts, contact means, and contact address.
Compared with the metadata standard, the core metadata obtained based on the method can be addressed based on the identification of the digital object, and therefore, the storage address of the data resource is not included; the related information of the related responsible parties for data creation, release and maintenance is maintained in more detail, so that the standardization of data management is ensured; meanwhile, related information of the metadata mode of the digital object is maintained, and information such as access addresses, administrators and the like of the digital object registry system for issuing the digital object can be obtained through the digital object registry system identification.
According to the field characteristics, the expansion of the core metadata specifically means expansion operations such as adding, deleting, modifying and the like of metadata elements or entities, and the customized description of partial metadata elements in the core metadata can be ensured through the expansion of the metadata, so that a digital object registry system which complies with a core metadata mode is effectively compatible, the existing elements are multiplexed as much as possible, and the digital object metadata interoperation level between the digital object registry systems is improved.
Specifically, the expansion of metadata needs to follow the following requirements: 1) Consider the tradeoff between digital object registration complexity and the need for an end user to discover and query a digital object. 2) Not only needs to meet the application requirements of the current stage, but also needs to be standardized in a certain time in the future should be considered. 3) The extension should be made with reference to national and international advanced standards of the related art. 4) The existing metadata mode is fully analyzed according to the minimizing principle during expansion, and the expansion is performed when the existing mode cannot meet the requirement. 5) The extended metadata should not conflict with the metadata entity, the name of the metadata element, the definition of the existing schema definition. 6) The newly added metadata elements are preferentially organized in the proper metadata entities in the existing metadata modes, and if the existing metadata entities cannot meet the requirements of the newly added metadata elements, the metadata entities can be newly built. 7) The aliases are allowed to be added to the Chinese and English names and the abbreviated names of the core metadata elements so as to meet the requirements of specific applications. For example, the core metadata element "time information" may increase the alias "event occurrence time". 8) The definition of the core metadata element is allowed to be refined, and the new definition must not contradict the original definition. For example, the core metadata element "time information" may modify the time at which an event defined as a digital object description occurs. 9) The value range of the core metadata element is allowed to be limited, for example, the value range is defined as an integer in the core metadata standard, and the extension metadata may specify an integer greater than 0 and less than 100 when the value range is defined. 10 Allowing for more stringent optional restrictions to be imposed on existing metadata elements, i.e., metadata elements defined as optional may be modified to be mandatory, non-optional, or conditional mandatory. 11 Allowing a more stringent maximum frequency of use to be imposed on existing metadata elements, e.g., metadata elements defined as unlimited frequency of use may be modified to occur only 2 times.
In an alternative embodiment, the mapping relationship between different digital object metadata modes is determined according to the functions or semantics of the metadata elements of the digital object metadata modes, and the mapping relationship comprises steps B1 to B3:
Step B1: a first metadata element is determined in a first digital object metadata schema.
Step B2: in a second digital object metadata schema, a second metadata element that is functionally or semantically identical to the first metadata element is queried.
Step B3: a mapping relationship is established between the first metadata element and the second metadata element.
In the embodiment of the present application, the first digital object metadata schema and the second digital object metadata schema are any two different digital object metadata schemas, and the first metadata element refers to any one metadata element included in the first digital object metadata schema. In the implementation, a metadata element is randomly determined in a first digital object metadata mode, whether a second metadata element with consistent semantics or functions exists in a second digital object metadata model is searched, and a mapping relation between the two metadata elements is established so as to realize conversion of heterogeneous digital object metadata.
In an alternative embodiment, constructing the interconnection relationship of different digital object registry systems according to the mapping relationship and the digital object interface protocol, including steps C1 to C3:
Step C1: it is determined whether the digital object registry system belongs to an unexpected task, the unexpected task being a digital object registry system that does not meet the direct interaction requirement.
Step C2: and under the condition that the digital object registry system belongs to an unexpected task, constructing point-to-point interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol, wherein the interconnection relations are connected through a metadata bridge.
Step C3: and constructing hierarchical interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol under the condition that the digital object registry systems do not belong to unexpected tasks.
In the embodiment of the application, the condition that the direct interaction requirement is not satisfied means that: digital object registry systems are not capable of direct interaction or the time, efficiency (e.g., inefficiency) of interaction does not meet the interaction requirements. For digital object registry systems belonging to unexpected tasks, an interconnection relationship is established in a manner of step C2, that is, a metadata bridge is established between every two interactive digital object registry systems, and because digital object metadata is distributed in different digital object registry systems, each digital object registry system may be heterogeneous, the different digital object registry systems establish metadata bridges in a bridging manner, so as to implement point-to-point connection. The main function of the metadata bridge is to convert heterogeneous digital object metadata modes of two connected digital object registry systems and realize the mutual transmission of digital object metadata of the two digital object registry systems. Fig. 3 is a schematic diagram illustrating a point-to-point interconnection relationship according to an embodiment of the present application. Because the building cost of each point-to-point metadata bridge is low, the requirements of the digital object registry system on time, efficiency and the like in the unexpected task scene can be met. For digital object registry systems that do not belong to unexpected tasks, the interconnection relationship is established in the manner of step C3, i.e., a hierarchical interconnection relationship is established between different digital object registry systems.
Specifically, in the case that the digital object registry system does not belong to an unexpected task, a hierarchical interconnection relationship is constructed between different digital object registry systems according to the mapping relationship and the digital object interface protocol, including a step D1 and a step D2:
Step D1: a central digital object registry system and a lower level digital object registry system for the central digital object registry system are determined, the central digital object registry system storing universal digital object metadata schemas and digital object metadata schemas for each lower level digital object registry system.
Step D2: a metadata bridge is established between the central digital object registry system and each of the lower digital object registry systems based on a mapping relationship between the universal digital object metadata schema of the central digital object registry system and the digital object metadata schema of each of the lower digital object registry systems, and the digital object interface protocol.
In the embodiment of the application, a central digital object registry system is introduced, and each lower-level digital object registry system needs to establish a metadata bridge with the central digital object registry system so as to realize the mapping and interconnection of the digital object metadata of the lower-level digital object registry system to the digital object metadata of the central digital object registry system.
Wherein the generic digital object metadata schema may be determined based on the core metadata to which the digital object metadata schemas of other lower level digital object registry systems are mapped. FIG. 4 is a schematic diagram of a hierarchical interconnection relationship provided by an embodiment of the present application, wherein the three digital object registry systems in FIG. 4 aggregate digital object metadata to a central digital object registry system via metadata bridges. Whereby the different digital object registry systems enable interoperability of digital object metadata through the central digital object registry system.
In an alternative embodiment, to achieve interoperability of digital object metadata in different digital object registry systems, the following steps E1 and E2 are further included:
Step E1: and each lower-level digital object registry periodically reports the digital object metadata to the central digital object registry system, or each lower-level digital object registry reports the changed digital object metadata to the central digital object registry system when the digital object metadata changes.
Step E2: each of the lower level digital object registry systems obtains digital object metadata for other digital object registry systems by initiating a data acquisition request to the central digital object registry system.
In particular implementations, the underlying digital object registry may report digital object metadata to the central digital object registry system in three ways: 1) Each lower digital object registry periodically reports the digital object metadata to the central digital object registry system, the reporting period is flexibly set according to actual conditions, and the reporting periods of different digital object registry systems can be different. For example, digital object registry system 1 reports digital object metadata to the central digital object registry system every 30 minutes, and digital object registry system 2 reports digital object metadata to the central digital object registry system every 20 minutes; 2) Each lower level digital object registry system reports the changed digital object metadata to the central digital object registry system only when the digital object metadata changes; 3) Each lower level digital object registry system periodically reports the digital object metadata to the central digital object registry system, and when the digital object metadata changes, the changed digital object metadata also needs to be reported to the central digital object registry system. For example, digital object registry system 1 reports digital object metadata to the central digital object registry system every 30 minutes, but the time interval is less than 30 minutes, but it is found that the digital object metadata changes, and at this time, the digital object metadata also needs to be reported to the central digital object registry system.
When the digital object registry system needs digital object metadata of other digital object registry systems to operate, the digital object registry system initiates a data acquisition request to the central digital object registry system to acquire the digital object metadata of the other digital object registry systems, thereby realizing interconnection of global digital object registry systems.
In an alternative embodiment, in the case where there are multiple central digital object registry systems, the method further comprises: establishing a metadata bridge between each two central digital object registry systems; or determining a root digital object registry system, and taking each central digital object registry system as a child node of the root digital object registry system, and establishing a metadata bridge between the root digital object registry system and each central digital object registry system.
In the embodiment of the application, the interconnection under other complex service scenes can be derived based on a central digital object registry system. For the digital object metadata interconnection of the distributed convergence of the digital object metadata interoperation of different general service fields, each central digital object registry system maintains the digital object metadata of the respective field, and a metadata bridge is established between the two central digital object registry systems to realize the interoperation of the digital object metadata of the two general service fields. The distributed converged digital object metadata interconnection can be suitable for application scenes with a small number of central digital object registry systems.
Illustratively, fig. 5 is a schematic diagram of a distributed converged digital object metadata interconnection provided by an embodiment of the present application, where, as shown in fig. 5, a central digital object registry system 1 maintains digital object metadata of a digital object registry system 1.1, a digital object registry system 1.2, and a digital object registry system 1.3; central digital object registry system 2 maintains digital object metadata for digital object registry system 2.1, digital object registry system 2.2, digital object registry system 2.3. A metadata bridge is established between the central digital object registry system 1 and the central digital object registry system 2 to enable interoperability of digital object metadata for two general service areas.
For the application scenario that the number of the central digital object registry systems is large, a root digital object registry system can be introduced, each central digital object registry system is used as a child node of the root digital object registry system, a metadata bridge is established between the root digital object registry system and each central digital object registry system, the central digital object registry system of each child node is responsible for maintaining the digital object metadata of the lower node of the central digital object registry system, and each child node obtains the digital object metadata of other nodes through the upper node of the central digital object registry system.
For example, fig. 6 is a schematic diagram of tree-shaped aggregated digital object metadata interconnection provided by an embodiment of the present application, and as shown in fig. 6, if the digital object registry system 1.1.1 wants to obtain digital object metadata of the digital object registry system 1.2.3, the digital object registry system 1.1.1 needs to initiate a data obtaining request to its upper node central digital object registry system 1.1, and the central digital object registry system 1.1 then initiates a data obtaining request to the upper node central digital object registry system 1 (i.e. root digital object registry system), obtains digital object metadata of the digital object registry system 1.2.3 that the central digital object registry system 1 aggregates step by step, and transmits the digital object metadata to the digital object registry system 1.1.1 step by step.
To sum up, in the embodiment of the present application, the digital object metadata is registered to the digital object registry system according to the digital object metadata schema, which characterizes the metadata elements and constraint rules; determining the mapping relation between different digital object metadata modes according to the functions or semantics of each metadata element of the digital object metadata modes; and constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol. Because the digital object metadata is registered in the digital object registry system according to the digital object metadata mode, the multiplexing effect of the digital object metadata is improved; and, according to the mapping relation between the digital object metadata modes and the interconnection relation of different digital object registry systems constructed by the digital object interface protocol, the interoperability among different digital object registry systems can be realized. In this manner, interoperability of digital object metadata is achieved in complex environments of heterogeneous multisource.
The embodiment of the application also provides a digital object metadata interoperation device facing to the heterogeneous registry, referring to fig. 7, fig. 7 is a schematic structural diagram of the digital object metadata interoperation device facing to the heterogeneous registry, where the device includes:
A first registration module 710 for registering digital object metadata with the digital object registry system in accordance with a digital object metadata schema, the digital object metadata schema characterizing metadata elements and constraint rules;
a first determining module 720, configured to determine a mapping relationship between different digital object metadata modes according to functions or semantics of metadata elements of the digital object metadata modes;
A first construction module 730, configured to construct an interconnection relationship of different digital object registry systems according to the mapping relationship and the digital object interface protocol.
In an alternative embodiment, the digital object metadata schema includes core metadata and extension metadata; the device comprises:
The second determining module is used for determining core metadata according to the metadata standard and the functions of the digital object metadata, wherein the core metadata comprises content information, data attributes and relation information;
and the expansion module is used for expanding the core metadata according to the field characteristics to obtain the expansion metadata.
In an alternative embodiment, the first determining module includes:
A first determination submodule for determining a first metadata element in a first digital object metadata schema;
a query module for querying a second metadata element with the same function or semantic as the first metadata element in a second digital object metadata mode;
and the first establishing module is used for establishing a mapping relation between the first metadata element and the second metadata element.
In an alternative embodiment, the first building block includes:
a third determining module, configured to determine whether the digital object registry system belongs to an unexpected task, where the unexpected task is a digital object registry system that does not meet a direct interaction requirement;
A first construction sub-module, configured to construct a point-to-point interconnection relationship between different digital object registry systems according to the mapping relationship and the digital object interface protocol, where the digital object registry systems belong to unexpected tasks, and the interconnection relationship is connected through a metadata bridge;
And the second construction submodule is used for constructing hierarchical interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol under the condition that the digital object registry systems do not belong to unexpected tasks.
In an alternative embodiment, the second building sub-module comprises:
A second determination sub-module for determining a central digital object registry system and a lower digital object registry system of the central digital object registry system, the central digital object registry system storing universal digital object metadata schemas and digital object metadata schemas for each lower digital object registry system;
and the second establishing module is used for establishing a metadata bridge between the central digital object registry system and each lower digital object registry system according to the mapping relation between the universal digital object metadata modes of the central digital object registry system and the digital object metadata modes of each lower digital object registry system and the digital object interface protocol.
In an alternative embodiment, in the case where there are multiple central digital object registry systems, the second building sub-module comprises:
A third establishing module for establishing a metadata bridge between each two central digital object registry systems;
and a fourth establishing module, configured to determine a root digital object registry system, and establish a metadata bridge between the root digital object registry system and each central digital object registry system by using each central digital object registry system as a child node of the root digital object registry system.
In an alternative embodiment, the second building sub-module comprises:
The reporting module is used for periodically reporting the digital object metadata to the central digital object registry system by each lower-level digital object registry, or reporting the changed digital object metadata to the central digital object registry system when the digital object metadata of each lower-level digital object registry changes;
And the acquisition module is used for each lower-level digital object registry system to acquire the digital object metadata of other digital object registry systems by initiating a data acquisition request to the central digital object registry system.
The embodiment of the application also provides an electronic device, and referring to fig. 8, fig. 8 is a schematic structural diagram of the electronic device. As shown in fig. 8, the electronic device 800 includes: the memory 810 and the processor 820 are in communication connection through a bus, and a computer program is stored in the memory 810 and can run on the processor 820, so that the steps of the digital object metadata interoperation method facing to the heterogeneous registry according to the embodiment of the application are realized.
The embodiment of the application also provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the digital object metadata interoperation method facing to the heterogeneous registry according to the embodiment of the application are realized.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus and devices according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the application.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
The above description of the digital object metadata interoperation method, device, equipment and medium for heterogeneous registry provided by the present application applies specific examples to illustrate the principles and embodiments of the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (10)
1. A method of interoperating digital object metadata for a heterogeneous registry, the method comprising:
registering digital object metadata to a digital object registry system according to digital object metadata patterns, the digital object metadata patterns representing metadata elements and constraint rules, the digital object metadata patterns being different for different fields;
Determining a mapping relation between different digital object metadata modes according to functions or semantics of metadata elements of the digital object metadata modes, wherein the mapping relation is used for converting heterogeneous digital object metadata;
And constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol, wherein the interconnection relations represent physical connection of the digital object registry systems for digital object metadata interactive sharing.
2. The heterogeneous registry-oriented digital object metadata interoperation method of claim 1, wherein the digital object metadata schema comprises core metadata and extension metadata; the digital object metadata schema is determined by:
determining core metadata according to metadata standards and functions of digital object metadata, wherein the core metadata comprises content information, data attributes and relation information;
And expanding the core metadata according to the field characteristics to obtain the expanded metadata.
3. The method of claim 1, wherein determining the mapping between different digital object metadata schemas based on the function or semantics of the metadata elements of the digital object metadata schemas comprises:
determining a first metadata element in a first digital object metadata schema;
Querying a second metadata element having the same function or semantics as the first metadata element in a second digital object metadata schema;
a mapping relationship is established between the first metadata element and the second metadata element.
4. The method of claim 1, wherein constructing an interconnection relationship between different digital object registry systems according to the mapping relationship and digital object interface protocol comprises:
determining whether the digital object registry system belongs to an unexpected task, wherein the unexpected task refers to the digital object registry system which does not meet the direct interaction requirement;
Under the condition that the digital object registry system belongs to an unexpected task, constructing point-to-point interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol, wherein the interconnection relations are connected through a metadata bridge;
and constructing hierarchical interconnection relations among different digital object registry systems according to the mapping relation and the digital object interface protocol under the condition that the digital object registry systems do not belong to unexpected tasks.
5. The heterogeneous registry-oriented digital object metadata interoperation method of claim 4, wherein constructing a hierarchical interconnection relationship between different digital object registry systems according to the mapping relationship and the digital object interface protocol, if the digital object registry systems do not belong to unexpected tasks, comprises:
Determining a central digital object registry system and a lower level digital object registry system of the central digital object registry system, the central digital object registry system storing universal digital object metadata schemas and digital object metadata schemas for each lower level digital object registry system;
A metadata bridge is established between the central digital object registry system and each of the lower digital object registry systems based on a mapping relationship between the universal digital object metadata schema of the central digital object registry system and the digital object metadata schema of each of the lower digital object registry systems, and the digital object interface protocol.
6. The heterogeneous registry-oriented digital object metadata interoperation method of claim 5, wherein in the case where there are multiple central digital object registry systems, the method further comprises:
Establishing a metadata bridge between each two central digital object registry systems; or alternatively, the first and second heat exchangers may be,
Determining a root digital object registry system, and taking each central digital object registry system as a child node of the root digital object registry system, and establishing a metadata bridge between the root digital object registry system and each central digital object registry system.
7. The heterogeneous registry-oriented digital object metadata interoperation method of claim 5, wherein the method further comprises:
Each lower-level digital object registry system periodically reports the digital object metadata to the central digital object registry system, or each lower-level digital object registry system reports the changed digital object metadata to the central digital object registry system when the digital object metadata changes;
each of the lower level digital object registry systems obtains digital object metadata for other digital object registry systems by initiating a data acquisition request to the central digital object registry system.
8. A digital object metadata interoperation device for heterogeneous registries, the device comprising:
The first registration module is used for registering the digital object metadata into the digital object registry system according to the digital object metadata modes, wherein the digital object metadata modes represent metadata elements and constraint rules, and the digital object metadata modes in different fields are different;
A first determining module, configured to determine a mapping relationship between different digital object metadata modes according to a function or semantics of each metadata element of the digital object metadata modes, where the mapping relationship is used for conversion of heterogeneous digital object metadata;
And the first construction module is used for constructing interconnection relations of different digital object registry systems according to the mapping relation and the digital object interface protocol, wherein the interconnection relations represent physical connection of the digital object registry systems for carrying out digital object metadata interaction sharing.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the heterogeneous registry-oriented digital object metadata interoperation method of any of claims 1 to 7 when the computer program is executed by the processor.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the digital object metadata interoperation method for heterogeneous registries of any of claims 1-7.
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