Re: [xml-dev] XML-SCHEMA Q: Adding an xsd:attribute to an xsd:element

[Rick Taylor <taylor@ppdm.org>]

What you need is to define a complex type with simple content:

<xsd:complexType name="widthType">
   <xsd:simpleContent>
     <xsd:extension base="xsd:decimal">
       <xsd:attribute name="units" type="xsd:string" use="optional"/>
     </xsd:extension>
   </xsd:simpleContent>
</xsd:complexType>

Then declare the element as that type:

<xsd:element name="width" type="widthType" />

Check out Roger Costello's tutorial.  It should answer many of these type 
of questions.
http://www.xfront.com/xml-schema.html

-rick

At 10:47 AM 5/15/03 -0500, Richard Rowell wrote:
>I'm sure the answer is painfully obvious, but I cant figure out how to
>add an attribute to an element.  I want a structure like this:
>
><box>
>  <size>
>    <width units='cm'>50</width>
>    <height units='m'>1</width>
>  </size>
></box>
>
>AFAICT I can only attach attributes to complex types in XMLSchema, but
>width and height are not complex types (are they?).  I know how to
>attach the "units" attribute to the size element, but I don't want it
>there.  This is what I have tried:
>
><xsd:element name="size">
>      <xsd:complexType>
>       <xsd:all>
>        <xsd:element name="width" type="xsd:integer" minOccurs='1'
>maxOccurs='1'>
>         <xsd:attribute name='units' type="xsd:string"/>
>        </xsd:element>
>        <xsd:element name="height" type="xsd:integer" minOccurs='1'
>maxOccurs='1'/>
>       </xsd:all>
>      </xsd:complexType>
>     </xsd:element>
>
>Xerces rejects this though:
>** Schema error: src-element.0: the content of an element information
>item must match (annotation?, (simpleType | complexType)?, (unique | key
>| keyref)*). **
>LINE: 1
>PUBLIC_ID: null
>SYSTEM_ID:
>
>--
>Richard Rowell <richard@bowmansystems.com>

Rick Taylor
XML Developer
PPDM Association