Need Simple Element with Attribute & Restriction

[husker]

I'm trying to crete a schema definition for a simple data type that has both an attribute & a restriction. For example, in the XML instance document, the element might look like this:

Code: Select all

<speed units="kilometers-per-hour">100</speed>

I tried to create a schema element like this, but OXygen says its's invalid. Can ayone see why?

Code: Select all

<xsd:simpleType name="Speed">

   <xsd:restriction base="xsd:nonNegativeInteger" >

      <xsd:maxInclusive value="999"/>

   </xsd:restriction>

   <xsd:attribute name="units" default="miles-per-hour"/>

</xsd:simpleType>

:roll

[sorin_ristache]

Hello,

W3C XML Schema does not allow an attribute in a simple type or a restriction of a simple type inside a complex type. You have to define the restriction in a separate simple type and extend it with the attribute in a new complex type.

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    <xsd:simpleType name="SpeedValuesType">

        <xsd:restriction base="xsd:nonNegativeInteger">

            <xsd:maxInclusive value="999"/>

        </xsd:restriction>

    </xsd:simpleType>

    

    <xsd:complexType name="SpeedType">

        <xsd:simpleContent>

            <xsd:extension base="SpeedValuesType">

                <xsd:attribute name="units" default="miles-per-hour"/>

            </xsd:extension>

        </xsd:simpleContent>

    </xsd:complexType>

Regards,.
Sorin

[husker]

That did it! Things that should be simple never are!

[Zearin]

If you're looking for simple, than I recommend ditching XML Schema.

Relax NG is much more writable AND readable, and Relax NG Compact even moreso. Take a look here and see how easy it is to read these schemas:http://relaxng.org/compact-tutorial-20030326.html

And no functionality is lost. Using Oxygen's Trang converter you can write and read schema definitions in the way-simpler Relax NG Compact and convert them to XSD for validation and compatibility with other XML tools.

Good luck!

-- Zearin