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Comments on Web Services Description Language (WSDL) Version 2.0 Part 0: Primer

From: Dennis Sosnoski <dms@sosnoski.com>
Date: Mon, 19 Sep 2005 23:07:51 -0700
Message-ID: <432FA737.8050002@sosnoski.com>
To: www-ws-desc@w3.org

I'm puzzled at the use of a special mechanism for importing XML schemas, 
as discussed in 2.3.2. AFAIKS, the same effect can be had by just using 
a simple xs:schema wrapper element:

  <xs:schema>
    <xs:import .../>
  </xs:schema>

This is a cleaner approach than just in-lining the xs:import and 
xs:include, since it minimizes the number of different ways of doing the 
same thing. From the comment at the end of 2.3.1, it seems that there's 
a misunderstanding of how schema operates here. As I understand it, 
imported schema definitions become part of the schema and have the same 
visibility as definitions made directly under the including schema. In 
support of this interpretation, section 4.2.3 of Schema Part 1 
(http://www.w3.org/TR/xmlschema-1/#composition-schemaImport) ends with:

The ·schema components· 
<http://www.w3.org/TR/xmlschema-1/#key-component> (that is {type 
definitions} <http://www.w3.org/TR/xmlschema-1/#type_definitions>, 
{attribute declarations} 
<http://www.w3.org/TR/xmlschema-1/#attribute_declarations>, {element 
declarations} <http://www.w3.org/TR/xmlschema-1/#element_declarations>, 
{attribute group definitions} 
<http://www.w3.org/TR/xmlschema-1/#attribute_group_definitions>, {model 
group definitions} 
<http://www.w3.org/TR/xmlschema-1/#model_group_definitions>, {notation 
declarations} <http://www.w3.org/TR/xmlschema-1/#notation_declarations>) 
of a schema corresponding to a <schema> 
<http://www.w3.org/TR/xmlschema-1/#element-schema> element information 
item with one or more <import> 
<http://www.w3.org/TR/xmlschema-1/#element-import> element information 
items must include not only definitions or declarations corresponding to 
the appropriate members of its [children] 
<http://www.w3.org/TR/xml-infoset/#infoitem.element>, but also, for each 
of those <import> <http://www.w3.org/TR/xmlschema-1/#element-import> 
element information items for which clause 2 
<http://www.w3.org/TR/xmlschema-1/#c-ims> above is satisfied, a set of 
·schema components· <http://www.w3.org/TR/xmlschema-1/#key-component> 
identical to all the ·schema components· 
<http://www.w3.org/TR/xmlschema-1/#key-component> of *I*.

Given this, I don't see any possible reason why xs:imported components 
of a schema would not be available for reference by QName in the WSDL.

  - Dennis
Received on Tuesday, 20 September 2005 06:05:41 GMT

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