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   RE: [xml-dev] Mandating element content

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     Thanks for the immediate reply. That's what even I did. But that seems
to introduce
some problem wrt xsd:key. I am using MSXML4.0 parser for XmlValidatingReader
in C#.

     The problem:

     I have the following element structure:
     <ELEM xsi:type="type1">
	  <KEYELEMENT>some content</KEYELEMENT>
     <ELEM xsi:type="type2">
	  <KEYELEMENT>some content</KEYELEMENT>

     Validation for this goes thru successfully even if KEYELEMENT has
duplicate values.

     A duplicate key error is thrown only if xsi:type for both the <ELEM>
elements are same.
     i.e an error is throw for the following XML. What could be the reason?

     <ELEM xsi:type="type1">
	  <KEYELEMENT>some content</KEYELEMENT>
     <ELEM xsi:type="type1">
	  <KEYELEMENT>some content</KEYELEMENT>

     Here both type1 and type2 are derived from a complextype "type".
     <element name="KEYELEMENT">
		<restriction base="string">
              <minlength value="1" />
     I have a key defined on KEYELEMENT.

Avinash Subramanya
Aztec Software And Technology Services Limited
23, 3rd 'A' Cross, 18th Main, 6th Block, Koramangala
Bangalore - 560095, India
Phone: 5522892/93 Ext: 205
Fax: 91-80-5521987
Mobile: 98441 29329

-----Original Message-----
From: Bryce K. Nielsen [mailto:bryce@sysonyx.com]
Sent: Saturday, March 29, 2003 1:57 PM
To: xml-dev@lists.xml.org
Subject: Re: [xml-dev] Mandating element content

>     How to make the content of an element mandatory in XML Schema???
>     For example:
>     If I have an element "ELEM" of type xsd:string, then the valid values
> for this element could be:
>     1. <ELEM>some string</ELEM>
>     2. <ELEM /> - I don't want this to happen in the instance document. I
> want to mandate that there be some
>         content for this element. How do I do this???

You could set the minLength facet to 1.

  <xsd:element name="ELEM">
      <xsd:restriction base="xsd:string">
        <xsd:minLength value="1"/>

Bryce K. Nielsen
SysOnyx Inc. (www.sysonyx.com)
Makers of xmlLinguist, the Text-to-XML Translator

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