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RE: Namespaces and XML Schema validation

• To: "Priscilla Walmsley" <priscilla@w...>,'Peter Bergström' <peter.bergstrom@e...>,<xml-dev@l...>
• Subject: RE: Namespaces and XML Schema validation
• From: Rex Brooks <rexb@s...>
• Date: Tue, 19 Nov 2002 11:46:54 -0800
• In-reply-to: <000001c28fd4$1d3f6d90$339afea9@WALMSLEYPH>
• References: <000001c28fd4$1d3f6d90$339afea9@WALMSLEYPH>

Is it possible to have a number of schemata that are extensions of a 
primary base schema within a single namespace? Or, do you have to 
create serial namespaces to accommodate such a multi-part modular 
language structure? Since that is exactly what we are doing with 
Human Markup, it would helpful. We are currently in the 30-day public 
comment period for our first spec so we are no where close to moving 
on to the secondary base schema.

Thanks,
Rex


At 9:01 AM -0500 11/19/02, Priscilla Walmsley wrote:
>Hi Peter,
>
>Yes, you can only have one schema document per namespace, so you will be
>required to have a.xsd, b.xsd, etc.
>
>>  PROBLEM 1
>>
>>
>>  Example document:
>>  <?xml version="1.0">
>>  <a1 xsi:noNamespaceSchemaLocation="a.xsd"
>>      xmlns:b="http:\\example.org\b\"
>>      xmlns:c="http:\\example.org\c\">
>>    <b:b1>This is element B1 from namespace B</b:b1>
>>    <a2>This is the second element from schema a</a2>
>>    <c:c1>This element is from namespace c</c:c1>
>>  </a1>
>
>a.xsd would look something like this:
>
><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>             xmlns:b="http:\\example.org\b\"
>             xmlns:c="http:\\example.org\c\">
><xsd:import namespace="http:\\example.org\b\" schemaLocation="b.xsd"/>
><xsd:import namespace="http:\\example.org\c\" schemaLocation="c.xsd"/>
>
><xsd:element name="a1" type="a1Type"/>
><xsd:complexType name="a1Type">
>   <xsd:sequence>
>     <xsd:element ref="b:b1"/>
>     <xsd:element name="a2" type="xsd:string"/>
>     <xsd:element ref="c:c1"/>
>   </xsd:sequence>
></xsd:complexType>
>
>and b.xsd and c.xsd would declare the b1 and c1 elements, globally.
>
>>  PROBLEM 2
>>
>>  Can I nest the namespaces in such an XML document, so that
>>  elements from one
>>  namespace contains elements from other namespaces, and still
>>  validate my XML
>>  document against one or several XML Schemas?
>
>Yes, in this case you could have a.xsd import the b namespace, and b.xsd
>import the c namespace.
>
>>  PROBLEM 3
>>
>>  Can elements from one namespace occur several times in a
>>  hierarchy where
>>  elements from other namespaces occur as fathers, i.e. true
>>  nesting, and
>>  still validate my XML document against one or several XML
>>  Schemas? And how
>>  would the XML Schemas that defines those namespaces look like?
>
>Yes, in that case a.xsd could import the b namespace, and b.xsd could
>import the a namespace.  Same thing with b and c. (there is no rule that
>says "circular imports" are not allowed; in fact, they are necessary.)
>
>
>>  PROBLEM 4
>>
>>  Can I, using the example from my problem 3, enforce (through
>>  validation)
>>  that instances are created with exactly those elements,
>>  occuring just one
>>  time each, with one single XML Schema?
>
>I assume you mean one single schema _document_ (since an XML Schema can
>be made up of more than one document, as we have seen above).  No, you
>can't - the best you could do is put wildcards where you want the
>elements from other namespaces to go.  Wildcards will allow you to
>constrain the namespace and number of elements that appear, but will not
>validate those elements without a schema document for that namespace.
>
>
>The examples from my XML Schema book are online at:
>
>http://www.datypic.com/books/DefXMLSchema/Examples.html
>
>I can't guarantee they're the exact same structure as your examples, but
>they might help.
>
>Hope that helps!
>Priscilla
>
>-----------------------------------------------------
>Priscilla Walmsley             priscilla@w...
>Author, Definitive XML Schema     (Prentice Hall PTR)
>-----------------------------------------------------
>
>
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-- 
Rex Brooks
Starbourne Communications Design
1361-A Addison, Berkeley, CA 94702 *510-849-2309
http://www.starbourne.com * rexb@s...

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