Mapping Schemas
We discussed XML schemas in Chapter 12, so I won't go back into them here. Suffice it to say that XML schemas are XML documents that define the type of data that other XML documents may contain. They are a replacement for the old DTD technology originally used for that purpose, and are easier to use and more flexible because they consist of XML themselves.
By their very nature, schemas also define document exchange formats. Because they define what a document may and may not contain, companies wishing to exchange XML data need to agree on a common schema definition to do so. XML schemas allow companies with disparate business needs and cultures to exchange data seamlessly.
The syntax for XML Schemas is still in the process of ...
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