SAP XML and SAP IDOC XML

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Hi Friends,
Can any one tell me what is the difference between SAP XML and SAP IDOC XML?
Regards,
Kumar
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Hi,
Various XML standards are supported by SAP. It presents data according to an SAP specification either in IDoc-XML or BAPI-XML, the SAP XML extensions for IDocs and BAPIs. It uses preprepared representations of the SAP interfaces to XML Commerce Business Language (xCBL) messages to facilitate communication with the MarketSet marketplaces.
Messages are stored in a generic envelope. This envelope contains metadata that controls, among other things, the routing of the messages. SAP supports two different standards for these envelopes - Microsoft BizTalk and a format similar to Simple Object Access Protocol (SOAP). Packaging SAP BAPIs in a standard envelope offers several advantages, including direct processing of messages by external applications and a uniform system of error handling.
Regards'
Aashish Sinha
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