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Here are your answers:
1. SAP is a pure XML processing engine. All data is exchanged as XML documents and the mapping is then done in XI. For EDI, just as well as for IDocs, XI has adapters and converters ready. For EDI, SAP XI uses heavy third-party EDI mappings to comply with EDI standards like EDIFACT, AS/4000, AS2 and adapters for the transfer methods like oFTP or X.400; e.g., the SAP recommended Seeburger adapters will cater to all common standards and message formats.
2. It should take one or two days to learn SAP XI if you have worked with middleware and Java before.
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