An element can have a wildcard for children content.

This is specified via the 'any' element:

<xs:element name="description">
<xs:complexType>
<xs:any namespace="##other" 
        processContents="lax" 
        minOccurs="0" maxOccurs="unbounded"/>
</xs:complexType>
</xs:element>

The 'processContents' attribute can have values 'strict', 'lax', or 'skip' and defaults to 'strict'.

'processContents' controls whether the schema processor must find a schema declaration for the contained elements.

The 'namespace' attribute specifies the allowed element namespaces and is a list of URIs with the following special values allowed:

• ##other - any other namespace than the target namespace.

• ##targetNamespace- the target namespace.

• ##local - no namespace

• ##any - any namespace--which is the default.

XHTML content wildcard:

<xs:element name="description">
<xs:complexType>
<xs:any namespace="http://www.w3.org/1999/xhtml" 
        processContents="lax" 
        minOccurs="0" maxOccurs="unbounded"/>
</xs:complexType>
</xs:element>