[web2py] Using xmlrpc + executesql('.schema') for database dictionary

[Bill Thayer]

I am writing the database definition for my documentation. Is there not a 
way to use xmlrpc to export the schema? Here was my first attempt:

@service.xmlrpc
def schema(table=None):
     "returns the table schema or database schema when argument is None"
     return db.executesql('.schema')



The .schema command came from 
http://stackoverflow.com/questions/604939/how-can-i-get-the-list-of-a-columns-in-a-table-for-a-sqlite-database

Then I called: http://127.0.0.1:8000/TAMOTO_DEV/default/call/xml/schema

but the browser returned "Object does not exist"

So I tried debugging by first confirming @service.xmlrpc works by using the 
example from the book:
@service.run
@service.xmlrpc
def concat(a,b):
    return a+b
But the call 
http://127.0.0.1:8000/TAMOTO_DEV/default/call/xml/concat?a=hello&b=world

returned:
XML Parsing Error: syntax error
Location: 
http://127.0.0.1:8000/TAMOTO_DEV/default/call/xml/concat?a=hello&b=world
Line Number 1, Column 39:<?xml version="1.0" encoding="UTF-8"?>helloworld
---------------------------------------------------------------------------------------------------^

I expected:

<document>
   <result>helloworld</result>
</document>

Like in the book.

Thanks for your insight.

Regards,
Bill