Passing tokens to a function

[Scott Bailey <artacus@xxxxxxxxxxx>]

I'd like to make an XMLTABLE() function, probably in plpython (not C). 
And I'd like to follow the SQL/XML standard. So a function call should 
look something like this:

SELECT *
FROM XMLTABLE('//node'
  PASSING xmldoc
  COLUMNS id INT PATH '@id',
    name VARCHAR(30) PATH 'name')

Is this possible to pass in the tokens or do I need to abandon the 
standard and just take parameters, probably something more like:

SELECT *
FROM XMLTABLE('//node', xmldoc,
array[xt_column('id', INT, '@id'), xt_column('name', VARCHAR(30), 'name')])

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