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From: J Kimball <nntp@kmbll.com>
Newsgroups: comp.lang.ada
Subject: XML/Ada schema validation and XML namespaces
Date: Mon, 08 Apr 2013 14:58:55 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2013-04-08T14:58:55-05:00
List-Id: <comp.lang.ada>

Hello

I'm having the derndest time figuring out how to validate XML using
namespaces against a schema with XML/Ada. I seem to recall that doing
away with namespaces makes it work. After all the debug junk I don't
care about scrolls past, I see:

Validation_Error: Attribute "xmlns:agent" invalid for type
{http://singo1.com/schemas/agent}agent-message
Exception name: SCHEMA.VALIDATORS.XML_VALIDATION_ERROR

it seems like an issue with XML/Ada. Can you tell me if I'm missing a
feature to enable, something about XML that I'm missing or just wrong
code or an example that is using namespaces that works?

Some XML (agent.xml):

<?xml version="1.0"?>

<agent:response xmlns:agent="http://example.com/schemas/agent">
   <agent:message>Zerg</agent:message>
</agent:response>

A schema (agent.xsd):

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
targetNamespace="http://singo1.com/schemas/agent"
xmlns:agent="http://example.com/schemas/agent">
  <xs:element name="response" type="agent:agent-message"/>
  <xs:complexType name="agent-message">
    <xs:sequence>
      <xs:element ref="agent:message"/>
    </xs:sequence>
  </xs:complexType>
  <xs:element name="message" type="xs:string"/>
</xs:schema>

For those who are so inclined, I generated the XML schema from a RelaxNG
schema (agent.rng) with trang:

<?xml version="1.0"?>

<rng:grammar
   xmlns:rng="http://relaxng.org/ns/structure/1.0"
   xmlns:a="http://relaxng.org/ns/annotation/1.0"
   xmlns:agent="http://example.com/schemas/agent"
   datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

   <rng:start>
      <rng:ref name="agent-response" />
   </rng:start>

   <rng:define name="agent-response">
      <a:documentation>A response from a client.</a:documentation>

      <rng:element name="agent:response">
         <rng:ref name="agent-message" />
      </rng:element>
   </rng:define>

   <rng:define name="agent-message">
      <a:documentation>A simple message.</a:documentation>

      <rng:element name="agent:message"><rng:data type="string"
/></rng:element>
   </rng:define>

</rng:grammar>

% trang agent.rng agent.xsd

agent.xml validates successfully against both schemas using jing and
xmllint:

% jing agent.rng agent.xml
% xmllint --relaxng agent.rng agent.xml
% xmllint --schema agent.xsd agent.xml