RE: Need help to understand using external schemas.

[Benson Cheng]

This is how I get it work.

1. Create a schema file xml.xsd, put the following content in it.
<?xml version="1.0" encoding="US-ASCII" ?>
<schema targetNamespace="http://www.w3.org/XML/1998/namespace";
xmlns="http://www.w3.org/2000/10/XMLSchema"; 
        xmlns:x="http://www.w3.org/XML/1998/namespace";>

 <attribute name="lang" type="language">
 </attribute>
</schema>

2. Add following import in your schema file

<import namespace="http://www.w3.org/XML/1998/namespace";
        schemaLocation="somepath/xml.xsd"/>

3. Reference the xml:lang as follow:

        <complexType    name="FreeFormTextType">
            <simpleContent>
              <extension base="string">
                        <attribute      ref="xml:lang"/>
                        <minLength value="1"/>
                        <maxLength value="256"/>
              </extension>
            </simpleContent>
        </complexType>


Hope this can help.
Benson.


-----Original Message-----
From: Vadim Solonovich [mailto:[EMAIL PROTECTED]
Sent: Tuesday, April 17, 2001 8:04 AM
To: [EMAIL PROTECTED]
Subject: Need help to understand using external schemas.


Dear All !

Could anybody help me understand how can I  use the features from
XML/Xpath/Xlink/Xpointer or other schemas ? 

1.How can I correctly import element definfitions and type declarations from
those schemas ? 
As a a test I've tried to import attribute type xml:lang from XML namespace.

The following very simple example failed with the error:

Schema error: Globally-declared attributes containing values MUST have "use"
present and set to "FIXED" or "DEFAULT" 

sample.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd='http://www.w3.org/2000/10/XMLSchema'
   xmlns:xml='http://www.w3.org/XML/1998/namespace' >

<xsd:import namespace="http://www.w3.org/XML/1998/namespace"; 
  schemaLocation="http://www.w3.org/2000/10/xml.xsd"/> 

 <xsd:element name="faq">
  <xsd:complexType>
   <xsd:simpleContent>
    <xsd:extension base="xsd:string">
     <xsd:attribute ref = "xml:lang" /> 
    </xsd:extension>
   </xsd:simpleContent>
  </xsd:complexType>
 </xsd:element>
</xsd:schema>

What am i doing wrong ?

2.  Which value should I use in schemaLocation attribute for 
- XLink ?
- XPointer ?
- XPath ?
- other XML related ?


Thanks in advance,
    Vadim Solonovich



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