DB2 10.5 for Linux, UNIX, and Windows

Evolving an XML schema

An XML schema that is registered in the XML schema repository (XSR) can be evolved into a new, compatible XML schema without the need for already stored XML instance documents to be validated again. Only the XML schema as registered in the XSR is updated; the stored XML instance documents, including their URI identifiers, remain unchanged.

Before you begin

Before a schema can be evolved, the new XML schema must be compatible with the original one. If the two schemas are not compatible, the XSR_UPDATE stored procedure or the UPDATE XMLSCHEMA command will return an error and no schema evolution takes place. See Compatibility requirements for evolving an XML schema.

About this task

To evolve an XML schema in the XSR:

Procedure

Call the XSR_REGISTER stored procedure or run the REGISTER XMLSCHEMA command to register the new XML schema in the XSR.
Finally, call the XSR_UPDATE stored procedure or run the UPDATE XMLSCHEMA command to update the new XML schema in the XSR.

What to do next

Successful schema evolution replaces the original XML schema. Once evolved, only the updated XML schema is available.