Decomposing XML documents with annotated XML schemas

When you want to store pieces of an XML document in columns of one or more tables, you can use annotated XML schema decomposition. This type of decomposition breaks an XML document down for storage in tables, based on the annotations specified in a registered annotated XML schema.

1. If you are using a database created from earlier versions of DB2® database products, run the BIND command using the list file xdb.lst, which is found in the sqllib/bnd directory.
2. Annotate the schema documents with XML decomposition annotations.
3. Register the schema documents and enable the schema for decomposition.
4. If any of the registered schema documents that belongs to the XML schema have changed, then all documents for this XML schema must be registered again and the XML schema must be enabled for decomposition.
5. Depending on the location of the XML document to be decomposed, use one of the methods indicated, providing the XSR object name for the XML schema:
   • For a single XML document is on the file system, use one of the following methods:
     • Call one of the XDBDECOMPXML stored procedures that is just large enough for the size of the document being decomposed. ¹
     • Issue the DECOMPOSE XML DOCUMENT command.
   • For one or more documents are stored in a binary or XML column, use one of the following methods:
     • Issue the DECOMPOSE XML DOCUMENTS command.
     • Call the XDB_DECOMP_XML_FROM_QUERY stored procedure.