# 22. Virtuoso Functions Guide - xml_auto_dtd

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Functions Index

## xml_auto_dtd

returns an XML DTD for the result of a SQL query with a FOR XML clause
varchar xml_auto_dtd (in query varchar, in root_element varchar);
Description

This function returns an XML DTD for the results of a SQL query with a FOR XML clause. The returned DTD will apply to the output generated by xml_auto with the query in question after wrapping it into the specified root element.

Parameters
query – valid SQL query
root_element – name of root element to wrap result into
Return Types

varchar of the resultant DTD

Errors

If the query argument is not a valid SQL statement, i.e. SQL compiler signals an error message, the function resignals the error.

Examples

    SQL> select xml_auto_dtd ('  select "category"."CategoryID", "CategoryName",
        "ProductName", "ProductID"
        from "Demo".."Categories" "category", "Demo".."Products" as "product"
        where "product"."CategoryID" = "category"."CategoryID" for xml auto element', 'root');
    callret
    VARCHAR
    _______________________________________________________________________________

    <!-- dtd for output of the following SQL statement:
      select "category"."CategoryID", "CategoryName",
    		"ProductName", "ProductID"
    	from "Demo".."Categories" "category",

    		"Demo".."Products" as "product"
    	where "product"."CategoryID" = "category"."CategoryID"
    	for xml auto element
    -->
    <!ELEMENT root (#PCDATA | category)* >
    <!ELEMENT category (#PCDATA | CategoryID | CategoryName | product)* >
    <!ELEMENT product (#PCDATA | ProductName | ProductID)* >
    <!ATTLIST category	>
    <!ATTLIST product	>
    <!ELEMENT CategoryID (#PCDATA)>
    <!ATTRLIST CategoryID	>
    <!ELEMENT CategoryName (#PCDATA)>
    <!ATTRLIST CategoryName	>
    <!ELEMENT ProductName (#PCDATA)>
    <!ATTRLIST ProductName	>
    <!ELEMENT ProductID (#PCDATA)>
    <!ATTRLIST ProductID	>

    1 Rows. -- 4 msec.

See Also

xml_auto

xml_auto_schema