CN102186104A - Content communication realization method and system - Google Patents
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- CN102186104A CN102186104A CN 201110099697 CN201110099697A CN102186104A CN 102186104 A CN102186104 A CN 102186104A CN 201110099697 CN201110099697 CN 201110099697 CN 201110099697 A CN201110099697 A CN 201110099697A CN 102186104 A CN102186104 A CN 102186104A
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Abstract
The embodiment of the invention discloses a content communication realization method and a content communication realization system, which relate to the technical field of multimedia. The method comprises the following steps of: receiving a first message and an application definition interface (AID) file from a transmission domain, wherein the first message comprises a transmission domain identifier and an ADI file name, and the ADI file comprises content data to be transmitted; storing the ADI file in a local domain; and transmitting a second message to the transmission domain to inform the transmission domain of successful content reception. The embodiment of the invention is mainly applied to the processing of content communication among Internet protocol television (IPTV) systems, and realizes the interconnection and communication of program contents among a plurality of IPTV systems and/or a plurality of non-IPTV systems.
Description
Technical field
The present invention relates to multimedia technology field, relate in particular to a kind of method and system that realize the content intercommunication.
Background technology
At present; the programme content that same operator provides; for example; the video frequency requested program broadcasting-like program, channel and table information, program contents such as information class information; usually can be kept at a plurality of IPTV (Internet Protocol Television; IPTV) in system and/or a plurality of non-IPTV system, these IPTV systems and/or a plurality of non-IPTV system also can be deployed in different zones, obtain programme content apace from the IPTV system with the user who makes things convenient for zones of different.
In the prior art, main by manually carrying out the mode of manual typing when the programme content in above-mentioned a plurality of IPTV systems and/or a plurality of non-IPTV system is carried out maintenance update, to operate more loaded down with trivial detailsly, maintenance cost is higher, and maintenance efficiency is lower.Thereby, operator carries out unified management and maintenance to programme content for convenience, also for the programme content of real-time update can be provided to the user, how be badly in need of solving between above-mentioned a plurality of IPTV systems and/or a plurality of non-IPTV system and realize the problem that programme content is shared.Yet, also do not have a kind of scheme that interconnects that can between above-mentioned a plurality of IPTV systems and/or a plurality of non-IPTV system, carry out programme content in the prior art.
Summary of the invention
Embodiments of the invention provide a kind of method and system that realize the content intercommunication, have realized interconnecting of programme content between a plurality of IPTV systems and/or a plurality of non-IPTV system.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of method that realizes the content intercommunication comprises:
Receive and send first message and the ADI file that include transmission domain identifier, application definition interface ADI file name that the territory sends, described ADI file includes content-data waiting for transmission;
In this territory, preserve described ADI file;
Send second message to described transmission territory, to notify the received content success of described transmission territory.
A kind of system that realizes the content intercommunication comprises:
Receiving element is used to receive first message and the ADI file that sends domain identifier, application definition interface ADI file name that include that sends the territory transmission, and described ADI file includes content-data waiting for transmission;
Preserve the unit, be used at the described ADI file of this territory preservation;
Transmitting element is used for sending second message to described transmission territory, to notify the received content success of described transmission territory.
In the described embodiment of the invention of technique scheme, this territory sends first message and the ADI file that include transmission domain identifier, application definition interface ADI file name that the territory sends by receiving, and described ADI file includes content-data waiting for transmission; And in this territory, preserve described ADI file, can realize the content intercommunication between this territory and the transmission territory, this territory that the embodiment of the invention provides is specifically as follows the IPTV system, and the transmission territory in the embodiment of the invention is specifically as follows the IPTV system, also can be non-IPTV system.That is it is professional interconnected to adopt technical solution of the present invention to realize between a plurality of IPTV system, also can realize professional interconnected between a plurality of IPTV systems and non-IPTV system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of flow chart of realizing the method for content intercommunication that Fig. 1 provides for the embodiment of the invention 1;
The another kind that Fig. 2 provides for the embodiment of the invention 1 is realized the flow chart of the method for content intercommunication;
Fig. 3 provide for the embodiment of the invention 1 another realize the flow chart of the method for content intercommunication;
A kind of structure chart of realizing the system of content intercommunication that Fig. 4 provides for the embodiment of the invention 2;
The another kind that Fig. 5 provides for the embodiment of the invention 2 is realized the structure chart of the system of content intercommunication;
Fig. 6 provide for the embodiment of the invention 2 another realize the structure chart of the system of content intercommunication;
A kind of flow chart of realizing the method for content intercommunication that Fig. 7 provides for the embodiment of the invention 3.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment 1:
The embodiment of the invention provides a kind of method that realizes the content intercommunication, and as shown in Figure 1, this method comprises the steps:
101, receive first message and the ADI file that sends domain identifier, application definition interface ADI file name that include that sends the territory transmission, described ADI file includes content-data waiting for transmission;
Described content-data waiting for transmission is specifically represented the programme content descriptor.For example, the metadata in the VOD video class program, television channel program timetable data, information service and basic data etc.
102, in this territory, preserve described ADI file;
103, send second message to described transmission territory, to notify the received content success of described transmission territory.
In the embodiment of the invention, this territory sends first message and the ADI file that include transmission domain identifier, application definition interface ADI file name that the territory sends by receiving, and described ADI file includes content-data waiting for transmission; And in this territory, preserve described ADI file, can realize the content intercommunication between this territory and the transmission territory, this territory that the embodiment of the invention provides is specifically as follows the IPTV system, and the transmission territory in the embodiment of the invention is specifically as follows the IPTV system, also can be non-IPTV system.That is it is professional interconnected to adopt technical solution of the present invention to realize between a plurality of IPTV system, also can realize professional interconnected between a plurality of IPTV systems and non-IPTV system.
Simultaneously, adopt technical solution of the present invention to reduce the operation of artificial participation, on the one hand, made things convenient for content supplier that the content in the IPTV system is carried out maintenance and management, on the other hand, reduced the cost of content maintenance, improved maintenance efficiency.
Need to prove, another beneficial effect that the method that adopts the embodiment of the invention to provide is brought is: realize professional interconnected between a plurality of IPTV system, perhaps between a plurality of IPTV systems and non-IPTV system, realize professional when interconnected, all be in the position of equality between each system, that is arbitrary IPTV system both can be used as this territory, also can be used as and send the territory, need not extra management system controls the IPTV system, can realize between many IPTV system, the perhaps business intercommunication between a plurality of IPTV systems and non-IPTV system, reduced the input of hardware cost, network configuration is simpler.
Further, described ADI file is specially the XML file.Because the XML file format has extensibility, thereby when adopting the XML file to be implemented between many IPTV system transmitting content data, also be convenient to expand to transmitting content data in other non-IPTV systems.
Further, the embodiment of the invention provides in a kind of application scenarios, and this territory is the IPTV system, and above-mentioned steps 101 will take following dual mode to realize according to sending the dissimilar of territory when specific implementation:
Mode 1, when described transmission territory is the IPTV system, this territory receives described transmission territory and adopts the TCP/IP mode, transmission include first message that sends domain identifier, ADI file name and the ADI file that directly sends;
This TCP/IP mode relatively is suitable for network environment preferably under the situation, transmission ADI file between a plurality of IPTV system.
Mode 2, when described transmission territory is non-IPTV system, this territory receives described transmission territory and adopts the WebService mode, transmission include first message that sends domain identifier, ADI file name, from the specified file server, obtain the ADI file.
This WebService mode relatively is adapted at carrying out between IPTV system and the non-IPTV system transmission of ADI file.Particularly, sending the territory can be placed on the ADI file in the specified file server in described this territory in advance, sends first message then to described this territory, after described this territory receives first message, directly obtains described ADI file from described specified file server.
Further, as described in Figure 2, this method also comprises:
104, when comprising the media file sign in the described ADI file, from described transmission territory, obtain media file;
Above-mentioned steps 103 specifically will replace with following steps when described transmission territory sends second message at this moment: after getting access to described media file, send second message to described transmission territory, to notify the received content success of described transmission territory.
For example, when the content-data waiting for transmission that comprises in the above-mentioned ADI file is: during metadata in the VOD video class program, because VOD video class program also comprises the media file that playing programs is required, thereby need get access to simultaneously after metadata and the media file, could guarantee the normal demonstration and the broadcast of program.At this moment, after this territory receives the ADI file,, then need to obtain above-mentioned media file from sending the territory if determine to comprise the media file sign in the described ADI file.
Particularly, the described specific implementation of obtaining media file from described transmission territory comprises following several:
Mode one, when described transmission territory is the IPTV system, adopt the OverLay mode, from the distributed system DFS system in described transmission territory, obtain media file;
This OverLay mode is applicable to that network environment preferably under the situation, for example can be undertaken under the interconnected scene by the OverLay mode between the DFS system in the IPTV system, and the relevance between the IPTV system is tightr.
Mode two, when described transmission territory is non-IPTV system, adopt the FTP mode, from described transmission territory, obtain media file.
This FTP mode is suitable for the intercommunication of original media file, and is special under the bad situation of network environment.Can provide more independently content parking space for different content suppliers by the FTP control of authority, also be suitable for the interconnected expansion between IPTV system and the non-IPTV system.
Need to prove, between many IPTV system and/or non-IPTV system, during the transmission medium file, be not limited to above-mentioned OverLay mode and FTP mode, can also be other any transmission meanss, as long as two interconnected systems all support this transmission means, and in system, preestablish and get final product.
Further, in this territory, preserve described ADI file and obtain after the above-mentioned media file, if renewal has taken place for this ADI file and/or above-mentioned media file, for the ease of between this territory and transmission territory, realizing the synchronous renewal of content-data.As shown in Figure 3, send second message in above-mentioned steps 104 to described transmission territory, to notify after the success of described transmission territory received content, this method also comprises:
105, the incidence relation of record described ADI file, this domain identifier and described transmission domain identifier.
For example, the A territory sends to the B territory with the ADI file on the A territory, and B writes down in the territory incidence relation between described ADI file, A territory, the B territory.When the content-data in the above-mentioned ADI file after upgrading on the B territory, the B territory can be according to the incidence relation of described ADI file, this domain identifier and the described transmission domain identifier of above-mentioned record, the transmission territory of determining described ADI file is the A territory, that is also preserves described ADI file on the A territory.At this moment, the B territory can send to be upgraded in the ADI file of back to the A territory, thereby realizes the content synchronization between A territory and the B territory.
Embodiment 2:
The embodiment of the invention provides a kind of system that realizes the content intercommunication, as shown in Figure 4, comprising: receiving element 11, preserve unit 12 and transmitting element 13.
Wherein, described receiving element 11 is used to receive first message and the ADI file that sends domain identifier, application definition interface ADI file name that include that sends the territory transmission, and described ADI file includes content-data waiting for transmission;
Preserve unit 12, be used at the described ADI file of this territory preservation;
Transmitting element 13 is used for sending second message to described transmission territory, to notify the received content success of described transmission territory.
The system that the embodiment of the invention provides is specifically as follows the IPTV system.
In the embodiment of the invention, an IPTV system is referred to as a territory.For example, above-mentioned this territory and transmission territory can be represented two IPTV systems respectively.Send first message and the ADI file that include transmission domain identifier, application definition interface ADI file name that the territory sends by receiving, described ADI file includes content-data waiting for transmission; And in this territory, preserve described ADI file, can realize this territory and send content intercommunication between the territory that the transmission territory in the embodiment of the invention is specifically as follows the IPTV system, also can be non-IPTV system.That is it is professional interconnected to adopt technical solution of the present invention to realize between a plurality of IPTV system, also can realize professional interconnected between a plurality of IPTV systems and non-IPTV system.
Described ADI file is specially the XML file.Because the XML file format has extensibility, thereby when adopting the XML file to be implemented between many IPTV system transmitting content data, also be convenient to expand to transmitting content data in other non-IPYV systems.
Further, described receiving element 11 specifically is used for when described transmission territory is the IPTV system, receives described transmission territory and adopts the TCP/IP mode, first message that includes transmission domain identifier, ADI file name of transmission and the ADI file that directly sends;
Perhaps, described receiving element 11 specifically also is used for when described transmission territory is non-IPTV system, receive described transmission territory and adopt the WebService mode, first message that includes transmission domain identifier, ADI file name of transmission is obtained the ADI file from the specified file server.
Further, as shown in Figure 5, this system also comprises: acquiring unit 14.
Described acquiring unit 14 is used for obtaining media file from described transmission territory when described ADI file comprises the media file sign;
Particularly, described acquiring unit 14 specifically is used for when described transmission territory is the IPTV system, adopts the OverLay mode, obtains media file from the distributed system DFS system in described transmission territory;
Perhaps, described acquiring unit 14 specifically also is used for adopting the FTP mode when described transmission territory is non-IPTV system, obtains media file from described transmission territory.
At this moment, described transmitting element 13 specifically is used for after getting access to described media file, sends second message to described transmission territory, to notify the received content success of described transmission territory.
Further, in this territory, preserve described ADI file and obtain after the above-mentioned media file, if renewal has taken place for this ADI file and/or above-mentioned media file, for the ease of between this territory and transmission territory, realizing the synchronous renewal of content-data.As shown in Figure 6, this system also comprises: record cell 15 is used to write down the incidence relation of described ADI file, this domain identifier and described transmission domain identifier.
For example, the A territory sends to the B territory with the ADI file on the A territory, and B writes down in the territory incidence relation between described ADI file, A territory, the B territory.When the content-data in the above-mentioned ADI file after upgrading on the B territory, the incidence relation of described ADI file, this domain identifier and described transmission domain identifier that the B territory can be write down according to above-mentioned record cell 15, the transmission territory of determining described ADI file is the A territory, that is also preserves described ADI file on the A territory.At this moment, the B territory send to be upgraded in the ADI file of back to the A territory, thereby realizes the content synchronization between A territory and the B territory.
Embodiment 3:
The embodiment of the invention provides a kind of concrete application scenarios: A territory and B territory are the IPTV system, comprise CMS (Content Management System in this IPTV system, Content Management System), CIE (CMSIntegration Engine, the CMS integrating engine), CMSIS (CMS Integration System, the CMS integrated system), DFS (Distributed File System, distributed file system) etc.
Above-mentioned CMS is used to create cross-domain task, for example, creates cross-domain distributed tasks, cross-domain updating task etc.The concrete cross-domain task of creating is decided according to the practical application scene.
Above-mentioned CIE is cross-domain task work engine, on the one hand, is used for regular inquiry system and whether has pending cross-domain task, if having, then notifies CMSIS to send relevant content data and message.On the other hand, be used for regular inquiry system and whether have pending local reception task,, then notify DFS to obtain media file if having.
Above-mentioned CMSIS is the inter-domain communication module, is subjected to the scheduling of CIE, sends content-data and message between two territories.
Above-mentioned DFS is used for store media files.
Carrying out cross-domain distributed tasks with the A territory to the B territory below is example, introduces a kind of method that realizes the content intercommunication between A territory and B territory in detail.As shown in Figure 7, this method comprises:
201, the CIE in A territory inquires about regularly whether pending cross-domain distributed tasks is arranged in the A territory.
For example, when initial, when needs carry out the content-data of cross-domain distribution, system will be the newly-built cross-domain distributed tasks of this content-data waiting for transmission, and this moment, the state of this newly-built cross-domain distributed tasks was pending.
When if the CIE in 202 A territories inquires pending cross-domain distributed tasks, then notify the CMSIS in A territory, and the CMSIS that indicates described A territory sends to the described content-data waiting for transmission and first message according to set message format the CMSIS in B territory, at this moment, the state with described pending cross-domain distributed tasks is updated in the processing.
Above-mentioned content-data waiting for transmission will transmit with the form of ADI file, and described ADI file can adopt the XML form.
Can comprise acceptance domain in first message that CMSIS sent in described A territory and send information such as the identification information, task identification number in territory, cross-domain object type, object identity, Object Operations type (upgrading), ADI file name as newly-increased deletion.
TCP IP and WebService dual mode are supported in communication between A territory and the B territory.Wherein, for the tcp/ip communication mode, the ADI file will directly send after first message is sent completely, and is fit to the good situation of network condition; And in the WebService mode, at first A territory (transmission territory) is placed on the ADI file among the FileServer of B territory (acceptance domain) in advance, and send first message to the B territory, wait the B territory to receive this first message after, can from FileServer, obtain according to the ADI file name.
203, after the CMSIS in B territory receives first message, the content-data in this locality preservation ADI file, and newly-built this locality receives an assignment.If comprise the media file sign among the described ADI, then the state that described this locality is received an assignment is made as pending.
Need to prove that if do not comprise the media file sign among the described ADI, then the state that this locality is received an assignment is made as and finishes, and sends second message to the CMSIS in A territory, to notify the received content success of described A territory.At this moment, A territory CMSIS receives described second message, and the state of the cross-domain distributed tasks in the A territory is updated to finishes.
204, the CIE in B territory inquires about regularly whether the local reception task is arranged in the B territory.
If the CIE in 205 B territories inquiry B has the local reception task in the territory, then notify DFS to obtain media file, at this moment, the local reception task status is updated in the processing.
206, the DFS in B territory obtains media file from the DFS in A territory.
207, after the DFS in B territory obtained media file success, the CIE media file in notice B territory had obtained success, and the state that will upgrade the local reception task is that media file is finished dealing with, and is to be sent.At this moment, user's normal program request this content program just.
208, to inquire the state of local reception task be that media file is finished dealing with to the CIE in B territory, when to be sent, that is confirm that this local reception task finished obtaining of media file, at this moment, send the CMSIS of second message, to notify the received content success of described A territory to the A territory.At this moment, A territory CMSIS receives described second message, and the state of the cross-domain distributed tasks in the A territory is updated to finishes.
Need to prove that after above-mentioned A territory received second message, cross-domain distributed tasks was finished, write down the incidence relation in ADI file, A territory and the B territory of described transmission this moment.Equally, after the B territory sent second message, the local reception task was finished, and also can write down the incidence relation in ADI file, A territory and the B territory of described transmission.So that under the situation that cross-domain synchronous program content data changes, can produce cross-domain updating task, make all territories that comprise this program update content data synchronously.
In addition, adopt the federalism of equality between A territory that the embodiment of the invention provides and the B territory, that is the B territory can be given by cross-domain distributing contents in the A territory, the A territory also can be given by cross-domain distributing contents in the B territory, and the two is reciprocity.
The content type that the method that the embodiment of the invention provides is supported includes but not limited to following several: VOD video class program, television channel program timetable data, information service and basic data etc.
During specific implementation, above-mentioned each content type all has corresponding service resume module separately in the CMSIS internal module, can be according to the demand of the system interconnect processing capacity of activating business easily.
For example, the data of VOD video class program are divided into metadata and media data, therefore will comprise the handling process that DFS obtains media file;
Do not comprise media file in the television channel program timetable data, thereby only need handle ADI file synchronization flow process, can be implemented in place typing program data, all automatic reception is to the function of timetable data in many cover systems, and information service is as the same.
Basic data is to guarantee that content can normally cross-domain shared basis, this programme provides the automatic synchronizing function of basic data, control by database trigger, data between system for interconnecting will produce cross-domain synchronous task automatically, CMSIS is responsible for producing the ADI file of basic data, CIE is responsible for inter-domain communication, no media file, thereby, other handling processes are similar with above-mentioned cross-domain distribution flow shown in Figure 7, promptly do not need manual intervention, under the condition that two system interconnect are set, just can give system for interconnecting synchronously, with carrying out of flow processs such as convenient follow-up cross-domain distribution with the relevant rudimentary data message.
After the scheme that the employing embodiment of the invention provides, can set up the network that interconnects of content-data and media file data between each interconnected system easily, realize the cross-domain distribution of content, information such as while channel timetable can realize the synchronous effect in typing many places, a place, reduce the maintenance cost of operation greatly, simultaneously also make the renewal of content information can be synchronized to automatically in each dissemination system, reduce human intervention, guaranteed that simultaneously the real-time of content is upgraded.
The embodiment of the invention is mainly used in the processing of carrying out the content intercommunication between the IPTV system, has realized interconnecting of programme content between a plurality of IPTV systems and/or a plurality of non-IPTV system.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (12)
1. a method that realizes the content intercommunication is characterized in that, comprising:
Receive and send first message and the ADI file that include transmission domain identifier, application definition interface ADI file name that the territory sends, described ADI file includes content-data waiting for transmission;
In this territory, preserve described ADI file;
Send second message to described transmission territory, to notify the received content success of described transmission territory.
2. the method for realization content according to claim 1 intercommunication is characterized in that, this territory is the IPTV system, and include first message and the ADI file that send domain identifier, application definition interface ADI file name that described reception sends the territory transmission comprise:
When described transmission territory is the IPTV system, receives described transmission territory and adopt the TCP/IP mode, first message that includes transmission domain identifier, ADI file name of transmission and the ADI file that directly sends;
Perhaps, when described transmission territory is non-IPTV system, receives described transmission territory and adopt the WebService mode, transmission include first message that sends domain identifier, ADI file name, from the specified file server, obtain the ADI file.
3. the method for realization content according to claim 1 intercommunication is characterized in that, this territory is the IPTV system, and this method also comprises:
When comprising the media file sign in the described ADI file, from described transmission territory, obtain media file;
Describedly send second message to described transmission territory and comprise:
After getting access to described media file, send second message to described transmission territory.
4. the method for realization content according to claim 3 intercommunication is characterized in that, describedly obtains media file comprise from described transmission territory:
When described transmission territory is the IPTV system, adopt the OverLay mode, from the distributed system DFS system in described transmission territory, obtain media file;
Perhaps, when described transmission territory is non-IPTV system, adopt the FTP mode, from described transmission territory, obtain media file.
5. according to the method for each described realization content intercommunication of claim 1-4, it is characterized in that described ADI file is specially the XML file.
6. according to the method for each described realization content intercommunication of claim 1-4, it is characterized in that, also comprise: the incidence relation that writes down described ADI file, this domain identifier and described transmission domain identifier.
7. a system that realizes the content intercommunication is characterized in that, comprising:
Receiving element is used to receive first message and the ADI file that sends domain identifier, application definition interface ADI file name that include that sends the territory transmission, and described ADI file includes content-data waiting for transmission;
Preserve the unit, be used at the described ADI file of this territory preservation;
Transmitting element is used for sending second message to described transmission territory, to notify the received content success of described transmission territory.
8. the system of realization content according to claim 7 intercommunication, it is characterized in that, this territory is the IPTV system, described receiving element specifically is used for when described transmission territory is the IPTV system, receive described transmission territory and adopt the TCP/IP mode, first message that includes transmission domain identifier, ADI file name of transmission and the ADI file that directly sends;
Perhaps, described receiving element specifically also is used for when described transmission territory is non-IPTV system, receive described transmission territory and adopt the WebService mode, first message that includes transmission domain identifier, ADI file name of transmission is obtained the ADI file from the specified file server.
9. the system of realization content according to claim 7 intercommunication is characterized in that, this territory is the IPTV system, and this system also comprises:
Acquiring unit is used for obtaining media file from described transmission territory when described ADI file comprises the media file sign;
Described transmitting element specifically is used for after getting access to described media file, sends second message to described transmission territory.
10. the system of realization content according to claim 9 intercommunication, it is characterized in that, described acquiring unit specifically is used for when described transmission territory is the IPTV system, adopts the OverLay mode, obtains media file from the distributed system DFS system in described transmission territory;
Perhaps, described acquiring unit specifically also is used for adopting the FTP mode when described transmission territory is non-IPTV system, obtains media file from described transmission territory.
11. the system according to each described realization content intercommunication of claim 7-10 is characterized in that, described ADI file is specially the XML file.
12. the system according to each described realization content intercommunication of claim 7-10 is characterized in that, also comprises: record cell is used to write down the incidence relation of described ADI file, this domain identifier and described transmission domain identifier.
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