JP4220573B2 - Railway signal system database verification method - Google Patents

Description

  The present invention relates to a database verification method for verifying a database for a railway signal system.

Recently, with the introduction of digital control technology, railway signal systems are required to digitize more control elements than conventional analog control technology so that they can be handled as data.
In order to respond to such a request, a database for defining control elements is required. For example, a database for a railway signal system has been created by applying an application program such as RDB (relational database) software. .

However, when a conventional database for a railway signal system is created in a data format depending on RDB software, there are the following problems.
That is, in the data format that depends on RDB software, the data representation format is limited by the functions provided by RDB software, the data that can be handled is also limited, and it is necessary to define the association between data and the content of computation separately, and the configuration of the database There was a problem that it was complicated and had many restrictive elements, and it took time and effort to create it. It was also difficult to define hierarchical data such as defining other data in the data.

  Also, if you try to increase the data representation format and the data that can be handled within the range allowed by the applied RDB software, you will add your own data definition elements, which will impair the general versatility of the database and change the specifications However, there is also a problem that it takes time and the compatibility with other systems is lost.

  Furthermore, in order to ensure the versatility of the data format handled by the database, for example, it is possible to apply the CSV (Comma Separated Values) format. When even one “,” shown is lost, data cannot be reproduced on the data receiver side, making it difficult to guarantee data reliability and consistency. Further, since the CSV data format is a simple notation format and is a simple list of data, it has not been possible to define hierarchical data such as defining other data in the data.

  That is, when digital data is handled by applying digital control technology in a railway signal system, it is necessary to create a database that satisfies the following requirements. 1. Many control elements can be handled as data, and scalability is ensured. 2. The reliability and consistency of data at the time of transmission are ensured. 3. A variety of data formats such as hierarchical structures can be easily defined. 4). Migration from an existing database can be realized easily and at low cost. 5). Data compatibility is ensured between systems.

  The problem of the present invention is that many control elements can be handled as data, the reliability and consistency of data when transmitted can be ensured, various data formats can be easily defined, and migration from an existing database is easy and To provide a verification method for verifying the validity of a data base for a railway signal system that can be realized at low cost and that can secure data compatibility between systems, in accordance with data constraint conditions.

In order to solve the above-mentioned problems, the present invention applies an XML tree structure to various control elements included in an ATC control chart, a linkage chart, a signal display chart, an ATS control chart, or a railroad crossing control chart using XML. Each control element is arranged so that there is a connection relationship between the upper and lower levels of the tree structure, and the relationship between the control elements and other control elements that interact with the actual control content is included. For the railway signal system database in which the ATC control chart, interlocking chart, signal display chart, ATS control chart, or railroad crossing control chart is expressed in a format expressed by meta notation (defining the type and contents of control elements) XM for verifying the data structure of the railway signal system database according to the schema in which the data constraint conditions of the railway signal system database are defined Data verification is performed by a database system for railway signal systems that includes a parser, an additional verification program that verifies constraints on data that cannot be described in a schema language, and a database management system application that edits and outputs database data. The railroad signal system database verification method, wherein the railroad signal system database system reads the railroad signal system database before verification and uses the XML parser to store the railroad signal system database. A first verification step for verifying whether or not data is registered in accordance with data constraint conditions defined in the schema; and the railroad signal system in which the database system for the railroad signal system is verified in the first verification step. for Against database, by executing the additional verification program, and a second verification step of verifying whether validity data is registered in accordance with that constraint conditions against the can not be described in a schema language data, the train database system signal system, the data of the second and verification processing in the validation process database for the railway signaling systems, by executing the database management system application, the data editing step of editing in accordance with the editing command from outside the database system for the railway signaling system is defined, for the database data edited by the data editing process, running with the XML parser and the additional verification program, the schema of the database for railway signaling system Data constraints and schema terms When it is verified that the validity of the edited database data is ensured by the edit data verification process that verifies whether or not the restriction condition for the data that cannot be described in words is satisfied, and the edit data verification process, It said database system for railway signaling system, running the database management system application, a data registration step of registering the database data in the railway signaling system database, the database data by the editing data verification step is the editing A re-editing step in which the database system for the railway signal system executes the database management system application and re-edits the database data when the validity cannot be verified. Special It is set to.

  According to the present invention, many control elements can be handled as data, the reliability and consistency of data when transmitted can be ensured, various data formats can be easily defined, and migration from an existing database is easy and low. It is possible to provide a database for a railway signal system that can be realized at a low cost and can secure data compatibility between systems. Further, the verification process for guaranteeing the reliability of the database for the railway signal system can be easily and inexpensively multiplexed, and the reliability of the system itself for verifying the data in the database can be realized.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the basis for applying XML (eXtensible Markup Language) technology to create a database for a railway signal system will be described.

  In the database for the railway signal system, it is desirable to satisfy the items summarized in the above requirements 1 to 5, which will be an important factor in the future digitization of the railway signal system. In addition, when constructing a database with data defining control elements, it is necessary in a highly public railway system to standardize the definition contents and definition rules of data, and satisfy the above requirements 1-5. But it becomes important.

Recently, the XML technology has attracted attention as a data description language for describing the contents and rules of data transmitted and received on a communication network such as the Internet, and this XML technology will be briefly described.
The XML technology is a technology developed to solve the difficulty of defining various data contents and the difficulty of reusing data between companies as a drawback of the Hyper Text Markup Language (HTML) technology. . For this reason, the XML technology makes it possible to embed information such as data definition contents and definition rules in data, and a schema language (XML schema) which is a description language for describing the structure of data and the definition of rules. A technique called an XML parser for verifying data described in a schema language has been proposed.

  In XML, data (elements) can be described in a nested manner in the data, and the data configuration can be described in a tree structure, which is advantageous for handling many control elements as data and for data expandability. is there.

  Therefore, by describing the structure of data and the definition of rules in a schema language, and by incorporating an XML parser in the application, it has elements that can standardize the contents of data and the definition of the rules. Reuse of data transmitted / received in the network can be realized easily.

  Considering the characteristics of the XML technology as described above, it becomes possible to create a database that satisfies the above requirements 1 to 5 by applying the XML technology in the database for the railway signal system, and has the following merits. Can be obtained.

  Advantage 1: When XML technology is used, a tree structure model can be adopted as the data model of the database. Therefore, data expression power, expandability, and flexibility compared to the table structure that has been the mainstream of conventional database models A database with excellent performance can be created, and advanced data processing becomes possible.

  Advantage 2: Using XML technology simplifies and simplifies the logical design of the database, enables efficient design and test work, and results in higher reliability of the database as a result. Can be expected enough.

  Advantage 3: When using XML technology, when describing a database, the schema for the database that defines the rules for describing the database can be described in a schema language. Therefore, it is easy to improve the completeness of the verification function for verifying the constraints on the data, which can contribute to the increase in the value of the entire system.

  Advantage 4: By describing in a schema language, it is possible to reduce the cost of creating a program required for the entire database reliability verification, and a significant reduction in development cost can be expected.

  Advantage 5: A general-purpose XML parser corresponding to a schema language (a library for reading XML data into a program and having a data verification function in accordance with the schema) can be incorporated into the database system, causing problems such as data destruction. On the other hand, it is possible to perform a check at a high level, and it is possible to enhance the system in terms of ensuring the reliability of the database.

  Advantage 6: By using a general-purpose XML parser, it is possible to incorporate multiple XML parsers without increasing development costs and processes, and double the constraint processing for data, that is, the reliability of verification processing. Improvement can be realized easily.

  Advantage 7: By using a general-purpose XML parser, procedures necessary for data processing of text format data such as lexical analysis and syntax analysis become unnecessary on the application software side. Development of "condition verification program" and "various application programs for constructing database management system" can be realized efficiently and at low cost.

FIG. 1 is a diagram showing an example of a database creation process for a railway signal system to which the present invention is applied.
In the database creation process of FIG. 1, first, a railway signal system database description language (hereinafter referred to as RSDBL) is used as a language for expressing data required by the railway signal system database (hereinafter referred to as RSDB) 10 using XML. RSDB10 which registers data using this RSDBL is created (step S10). At this time, since the data registered in the RSDB 10 has not been verified, it is referred to as the pre-verification RSDB 10 as shown in the figure.

  Next, for the purpose of ensuring the safety and reliability of the data registered in the RSDB 10, the RSDBL schema 20 that defines the constraint conditions of the data registered in the RSDB 10 is described in the XML schema language (step S20).

  Next, the general-purpose XML parser 30 corresponding to the schema language applied to the RSDBL schema 20 is used to verify the data structure of the RSDB 10 according to the RSDBL schema 20 (step S30). The additional verification program 40 has a function of verifying constraint conditions for data that cannot be described in a schema language, and verifies the constraint conditions for data in the RSDB 10 as a complementary role execution unit of the XML parser 30 (step S40).

  As a result of executing the processes of steps S30 and S40, a post-verification RSDB 10 ′ that ensures the safety and reliability of data can be created.

  As described above, the database description language RSDBL for the railway signal system is created using the XML technology, the RSDB 10 before verification is created using the RSDBL, the RSDBL schema 20 is described in the XML schema language, and the RSDBL The data in the RSDB 10 before verification is verified using a general-purpose XML parser 30 corresponding to the schema language applied to the schema 20 for the schema, and the data that cannot be described in the RSDBL schema 20 by the additional verification program 40 of the XML parser 30 “Restriction conditions” are verified, and the creation of the post-verification RSDB 10 ′ that secures the safety and reliability of the data is completed.

  Therefore, in the railway signal system using the post-verification RSDB 10 ', the definition contents and definition rules of the data defining the control element can be standardized, and the above merits 1 to 7 can be realized.

  In addition, as a concrete railway signal system to which the RSDB 10 'can be applied after verification, it can be mounted on a digitalized ATC (Automatic Train Control) and an electronic signal security facility such as electronic interlocking, and the RSDB 10' supplies data for final stage data. It is possible to construct a database system that guarantees sufficient safety and reliability.

  Here, a specific example of the RSDB system is shown in FIG. In FIG. 2, the RSDB system 100 includes an RSDB 10, an RSDBL schema 20, an XML parser 30, an additional verification program 40, and a database management system (hereinafter referred to as DBMS) application 50. The RSDB 10, the RSDBL schema 20, the XML parser 30, and the additional verification program 40 have the same functions as those shown in FIG.

  The DBMS application 50 is an application program for a database management system. The RSDB data D2 whose validity has been verified by the XML parser 30 is edited by application functions, form printing, etc., and the RSDB data is converted into a format that is easy for the user to view. Output.

Next, the operation of the RSDB system 100 of FIG. 2 will be described in the order of 1 to 4 shown in the figure. 1. The XML parser 30 verifies the validity of the data registered in the RSDB 10 according to the schema language of the RSDBL schema 20.
2. In order to verify “constraints on data” whose validity cannot be verified in the schema language in the XML parser 30, the RSDB data D1 is passed from the XML parser 30 to the additional verification program 40, and the “constraints on data” in the RSDB data D1. Is verified.
3. The XML parser 30 passes the verified RSDB data D2 to the DBMS application 50, and edits the RSDB data D2 and prints a form.
4). The DBMS application 50 passes the edited RSDB data D2 to the XML parser 30 and performs verification of the RSDB data D2 in the same manner as in steps 1 and 2 above. As a result of the verification, if the validity of the RSDB data D2 can be verified, the data is registered in the RSDB 10, and if the verification is not possible, the DBMS application 50 performs re-editing.

  As described above, if the database creation process for the railway signal system of the present embodiment and the database system are configured by applying the process, many control elements can be handled as data and the reliability of the data when transmitted For railway signaling systems that can ensure the compatibility and consistency of data, can easily define various data formats, can be easily migrated from existing databases at low cost, and can ensure data compatibility between systems. A database can be provided.

  Further, since the additional verification program 40 of the XML parser 30 makes it possible to verify “data constraint conditions” that cannot be described in the RSDBL schema 20, it is possible to guarantee the reliability of the database.

As a specific example of the RSDB system 100 of FIG. 2, FIG. 3 shows a configuration example of an ATC control chart database.
The ATC control chart database 60 of FIG. 3 classifies a part of various control elements included in the database by applying an XML tree structure, and each control element having a connection relationship at the upper and lower levels of the tree structure. Is arranged.

  In the ATC control chart database 60, “on the first level ground vehicle” 61 on the first level, “track circuit permutation” 62 on the second level, “track circuit” 63 on the third level, and “turn over” on the fourth level. “Common direction” 641 and “By opening direction” 642 are arranged. Furthermore, in the fifth layer below “common opening direction” 641, “() track circuit ID: once (numerical value (6 digits))” 651, “() belonging section number: once (0 to 63)” 652, “() Up / Down: once (down or up)” 653, “() Track circuit name: once (character string)” 654 and “ID track circuit name: once (character string)” 655 are arranged, In the fifth layer below “By switching opening direction” 642, “Switching opening direction” 656 is arranged.

  Furthermore, in the sixth layer below the “turning opening direction” 656, the “opening direction” 661, the “affiliation route” 662, the “track circuit length” 663, the “right-facing counter-turning condition” 664 and the “left-handed” "Converse toppling condition" 665 is arranged, and in the seventh layer under "Affiliation route" 662, "() Origin adjacent track circuit: once (character string or Nothing)" 671, "() End track adjacent track circuit : Once (character string or Nothing) "672," () track circuit starting direction km: once (numerical value) "673, and" () track circuit end point km distance: once (numerical value) "674 are arranged.

  As described above, by converting various control elements included in the ATC control chart into XML, the ATC control chart database can be reconfigured to be more versatile than before and can easily cope with specification changes and the like. 60 can be provided.

  In addition, the various control elements included in the ATC control chart are classified by applying the XML tree structure, and the control elements having connection relations are arranged at the upper and lower levels of the tree structure to classify the various control elements. Thus, the work of defining the connection relationship can be facilitated, and the work burden when the ATC control chart database 60 is created can be reduced.

In addition, in each control element arranged in the ATC control chart database 60 of FIG. 3, the actual control contents are mutually reciprocated, such as “common to turn opening direction” 641 and “for each turn opening direction” 642. It is specified by meta notation (defining the type and contents of the control element) including how to interact with other linked control elements.
Or, the control elements included in the ATC control chart should be rewritten so that the actual control contents are clearly shown, including the way the other control elements interact with each other, rather than the conventional symbolized notation. And the interpretation of the ATC control chart can be made easier.

  Further, in the ATC control chart database 60 of FIG. 3, “() track circuit ID: once (numerical value (6 digits))” 651 and “() belonging section number: once (0 to 63)” arranged in the fifth hierarchy. In 652 etc., “once (numerical value (6 digits))” and “once (0 to 63)” are described. These descriptions represent the data type and value set of the control element, the appearance frequency, and the like, and facilitate interpretation in the RSDBL schema 20.

  As an example of the railway signal database converted into XML by applying the present invention, the configuration example of the ATC control chart database 60 of FIG. 3 is shown. However, as another railway signal database, for example, an interlocking chart, a signal The present invention is also applicable to a display chart, an ATS control chart, a level crossing control chart, and the like.

It is a figure which shows an example of the database preparation process for the railway signal system in one embodiment to which this invention is applied. It is a figure which shows an example of the database system for railroad signal systems in one embodiment to which this invention is applied. It is a figure which shows the structural example of the ATC control chart database to which the tree structure of XML in one embodiment to which this invention is applied is applied.

Explanation of symbols

10 RSDB
20 RSDBL schema 30 XML parser 40 Additional verification program 50 DBMS application 60 ATC control chart database

Claims (1)

Using XML, classify various control elements included in the ATC control chart, interlocking chart, signal display chart, ATS control chart, or level crossing control chart using the XML tree structure, and the upper and lower levels of the tree structure. Each control element is arranged so that there is a connection relationship, and a meta notation including how the control element interacts with the actual control contents (defines the type and contents of the control element) ) For the railway signaling system database in which the ATC control chart, the interlocking chart, the signal display chart, the ATS control chart, or the railroad crossing control chart is represented,
A schema in which data constraint conditions for the railway signal system database are defined, an XML parser that verifies the data configuration of the database for the railway signal system in accordance with this schema, and additional constraints that verify the constraint conditions for data that cannot be described in the schema language With a database system for railway signal systems that includes a verification program and a database management system application that edits and outputs database data,
A method for verifying the database for the railway signaling system for performing data verification,
The railway signaling system database system reads the railway signaling system database before verification, and the XML parser is used to register data in accordance with the data constraint conditions defined in the railway signaling system database schema. A first verification process for verifying whether or not
It said database system for railway signaling system, to the first verification step in the verification process have been the railway signaling system database, by executing the additional verification program, against a can not be described in a schema language data a second verification step of verifying whether validity data is registered in accordance with constraints conditions,
It said database system for railway signaling system, the data of the second and verification processing in the validation process database for the railway signaling systems, by executing the database management system application, data editing to be edited according to edit command from outside Process,
The railway signal system database system is defined in the railway signal system database schema by executing the XML parser and the additional verification program on the database data edited in the data editing step. Edit data verification process for verifying the validity of the data constraint conditions and the constraint conditions for data that cannot be described in a schema language,
If the validity of the database data the editing by the editing data verification process is verified as being secured, said database system for railway signaling system, running the database management system application, the database data A data registration step of registering in the railway signaling system database;
When it is not possible to verify that the edited database data has been validated by the edited data verification step, the database system for the railway signal system executes the database management system application, and the database data Re-editing process to re-edit,
A method for verifying a database for a railway signal system, comprising:

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