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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: XML/Ada schema validation and XML namespaces
Date: Tue, 09 Apr 2013 12:45:20 +0100
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Date: 2013-04-09T12:45:20+01:00
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J Kimball <nntp@kmbll.com> writes:

> 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?

I think you may have been using the AdaCore documentation at [1]?

If so, I think the problem is that the examples in 6.4, 6.5 don't
actually set the grammar to be used by the reader; in 6.3 there's a
declare block which shows you how to do it, eg

   with Sax.Readers;           use Sax.Readers;
   with Schema.Readers;        use Schema.Readers;
   with Schema.Schema_Readers; use Schema.Schema_Readers;
   with Schema.Validators;     use Schema.Validators;
   with Input_Sources.File;    use Input_Sources.File;

   with Ada.Text_IO; use Ada.Text_IO;

   procedure SchemaExample is
      Grammar : XML_Grammar;
      Schema  : Schema_Reader;
      Input : File_Input;
      My_Reader : Validating_Reader;
   begin
      Open ("agent.xsd", Input);
      Parse (Schema, Input);
      Close (Input);

      Grammar := Get_Grammar (Schema);

      Set_Public_Id (Input, "Agent file");
      Open ("agent.xml", Input);

      Set_Grammar (My_Reader, Grammar);
      Set_Feature (My_Reader, Schema_Validation_Feature, True);
      Parse (My_Reader, Input);

      Close (Input);

      Put_Line ("OK.");
   end SchemaExample;

which outputs "OK.".

I'm about to report this problem to AdaCore.

[1] http://docs.adacore.com/xmlada-docs/schema.html