The NAMESPACES function is not supported by Postgres in the XMLELEMENT function. Is there any way to get this to work? I’ve looked at the WITH syntax but it doesn’t look like that will be helpful here.
I am afraid this is not supported in Postgres. The XMLNAMESPACE clause can be used only in XMLTABLE function. You need to make XML and in the next step you need to modify it as string with string operation.
It can be an interesting feature, and if it is supported by libxml2, then it can be easily implemented. But at this moment it is unsupported, and you have to use string operations - it should not be hard to use regexp.
