Recursion and validation

Hi,

I'm using XML spy as an authoring tool for my XML schema and when I
create the schema and validate it therein there are no problems.
However, when I attempt to validate against that schema using the Xerces
1.4.4 parser I get the following error:

Schema error: Anonymous complexType: ct-props-correct.3:  Recursive type
definition.

The actual section of the schema this message is reported as referring
to:

<xs:complexType name="integerType">
  <xs:sequence>
    <xs:element name="default" type="xs:integer" minOccurs="0"/>
    <xs:choice minOccurs="0">
	<xs:element name="range" maxOccurs="unbounded">
	  <xs:complexType>
	    <xs:sequence>
		<xs:element name="min" type="xs:integer"/>
		<xs:element name="max" type="xs:integer"/>
	    </xs:sequence>
	  </xs:complexType>
	</xs:element>
      <xs:element name="enum">
	  <xs:complexType>
	    <xs:sequence>
		<xs:element name="item" type="xs:integer"
maxOccurs="unbounded"/>
	    </xs:sequence>
	  </xs:complexType>
	</xs:element>
	<xs:element name="patterns" type="patternsType"/>
    </xs:choice>
  </xs:sequence>
</xs:complexType>

Can anyone help on this?