How to use xmlserialize, xmlagg, xmltext in postgresql?

@jasen 

To use xmlserialize, xmlagg, and xmltext in PostgreSQL, you can use them as part of a query to convert data into XML format.

Here is an example:

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SELECT
    XMLSERIALIZE(
        XMLAGG(
            XMLELEMENT(
                NAME 'person',
                XMLFOREST(
                    name AS "name",
                    age AS "age"
                )
            )
        ) AS XML
    )
FROM
    persons;

In this example, XMLAGG is used to aggregate rows into a single XML element, XMLFOREST is used to format the data as XML elements and attributes, and XMLSERIALIZE is used to convert the data into XML format.

You can customize the query based on your table structure and data to generate XML output according to your requirements.