Need xml element constructor given tag, attribute array & children

Hi Everybody,

I'm having trouble finding any way to build up
XML values from their logical components, e.g.
given an XML element tag, an array of attributes
in some form, and an xml[] array of children I
can't find any SQL function or expression which
would construct the XML element.  Surely the
syntactic sugary XMLPARSE must be calling such
a function?  Am I missing something or is
PostgreSQL missing something?

Thanks,

_Greg