To store or retrieve XML documents from DB2 with XML Extender, you enable the database for XML. XML Extender enables the database you are connected to, using the current instance.
When you enable a database for XML, the XML Extender:
The full name of an XML function is schema-name.function-name, where schema-name is an identifier that provides a logical grouping for SQL objects. You can use the full name anywhere you refer to a UDF or a UDT. You can also omit the schema name when you refer to a UDF or a UDT; in this case, DB2 uses the function path to determine the function or data type that you want.