"complex type definition representation error"

[jsb]

I am just beginning to work with schemas. I'm having a little trouble authoring a schema. (I'm using the oXygenXML editor, if that matters). If there is a better place for me to post this, please let me know.

I have an element in my XML document that looks as follows:

<wingarea unit="FT2"> 174.0 </wingarea>

The element is required, the content must be greater than 0, and the unit can be one of FT2 or M2 (the unit is optional, with FT2 being the default). I've read up on this, but so far I've been unsuccessful at making the correct schema, according to the oXygen XML error messages I get.

Here's what I've got so far:

<xs:element name="wingarea">
<xs:complexType>
<xs:simpleContent>
<xs:restriction base="xs:double">
<xs:minExclusive value="0"/>
<xs:attribute name="unit" use="optional" default="FT2">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="M2"/>
<xs:enumeration value="FT2"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:restriction>
</xs:simpleContent>
</xs:complexType>
</xs:element>

I get an error message when I try and validate a document using this schema:

--- start error message ---

"Complex Type Definition Representation Error for type '#AnonType_wingarea'. When <simpleContent> is used, the base type must be a complexType whose content type is simple, or, only if restriction is specified, a complex type with mixed content and emptiable particle, or, only if extension is specified, a simple type. 'double' satisfies none of these conditions. URL: http://www.w3.org/TR/xmlschema-1/#src-ct"

--- end error message ---

I'd be grateful if someone can give me a "simpleType" of explanation of where I've gone wrong! Thanks.

Jon Berndt
League City, TX

[jsb]

I've fixed this myself.

Code: Select all

<xs:simpleType name="AreaType">

 <xs:restriction base="xs:string">

  <xs:enumeration value="M2"/>

  <xs:enumeration value="FT2"/>

 </xs:restriction>

</xs:simpleType>

  

<xs:simpleType name="PositiveNumber">

 <xs:restriction base="xs:double">

  <xs:minExclusive value="0"/>

 </xs:restriction>

</xs:simpleType>  

  

<xs:element name="wingarea">

 <xs:complexType>

  <xs:simpleContent>

   <xs:extension base="PositiveNumber">

    <xs:attribute name="unit" use="optional" default="FT2" type="AreaType"/>

   </xs:extension>

  </xs:simpleContent>

 </xs:complexType>

</xs:element>

I hope this is correct, and helpful to someone else.

Jon

[sorin_ristache]

Hello,

Yes it does what you requested and is a valid XML Schema construction.

Regards,
Sorin