Performs an aggregate of multiple rows to construct an XML value.
- An instance of the XML type.
- ORDER BY
- The resulting values are ordered as follows:
- ASC - in ascending order
- DESC - in descending order
- NULLS FIRST - Nulls are ordered first
- NULLS LAST - Nulls are ordered last
- RETURNING CONTENT
- The return value is an XQuery document node.
- RETURNING SEQUENCE
- The return value is a sequence. This is the default.