I am slowly but surely getting some XML together with a lot of help from the stackoverflow community.I have a schema for some XML which works fine, and contains a lot of Type definitions. So, I have split my Schema to put the type definitions in a different schema so I can use them in other Schema. If you follow; This is what I have done...Here is my XML\[code\]<?xml version="1.0" encoding="UTF-8"?><ns:Root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns="urn:TestNamespace" xsi:schemaLocation="urn:TestNamespace Test1.xsd" > <ns:element1 id="001"> <ns:element2 id="001.1" order="1"> <ns:element3 id="001.1.1" /> </ns:element2> <ns:element2 id="001.2" order="2"> <ns:element3 id="001.1.2" /> </ns:element2> </ns:element1> <ns:element1 id="002"> <ns:element2 id="002.1" order="3"> <ns:element3 id="002.1.1" /> </ns:element2> <ns:element2 id="002.2" order="4"> <ns:element3 id="002.1.2" /> </ns:element2> </ns:element1> </ns:Root>\[/code\]This is my XSD\[code\]<?xml version="1.0"?><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:TestNamespace" xmlns:ns="urn:TestNamespace" elementFormDefault="qualified"> <xsd:include schemaLocation="TestTypes1.xsd"/> <xsd:element name="Root"> <xsd:complexType> <xsd:sequence> <xsd:element name="element1" maxOccurs="unbounded" type="ns:element1Type"/> </xsd:sequence> </xsd:complexType> <xsd:unique name="uniqueElement2OrderInElement1"> <xsd:selector xpath="./ns:element1" /> <xsd:field xpath="ns:element2/@order" /> </xsd:unique> </xsd:element></xsd:schema>\[/code\]And here is my new Schema for the Types The elements defined here are directly copied out of the above schema where they worked.\[code\]<?xml version="1.0"?><xsd:schema version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="urn:TestNamespace" xmlns:ns="urn:TestNamespace" elementFormDefault="unqualified"> <xsd:complexType name="element1Type"> <xsd:sequence> <xsd:element name="element2" maxOccurs="unbounded" type="ns:element2Type"/> </xsd:sequence> <xsd:attribute name="id" type="xsd:string"/> </xsd:complexType> <xsd:complexType name="element2Type"> <xsd:sequence> <xsd:element name="element3" type="ns:element3Type" /> </xsd:sequence> <xsd:attribute name="id" type="xsd:string" /> <xsd:attribute name="order" type="xsd:string" /> </xsd:complexType> <xsd:complexType name="element3Type"> <xsd:attribute name="id" type="xsd:string"/> </xsd:complexType> </xsd:schema>\[/code\]When I try to validate my XML now, I get this error;cvc-complex-type.2.4.a: Invalid content was found starting with element 'ns:element2'. One of '{element2}' is expected. [9] cvc-complex-type.2.4.a: Invalid content was found starting with element 'ns:element2'. One of '{element2}' is expected. [17] Where lines 9 and 17 relate to the opening of the first 'element2' in each 'element1'. As I say this worked before I split them out, so I think now I must have lost something, or failed to translate something from one to the other. It seems to be complaining that it expects one 'element2' and even if I delete one of the 2nd instances of 'element2' I get the same error. The attributes for the elements seem to be correct in that it allows an unlimited number of occurrences.I think then I am mis-reading the error.As ever, any help or guidance is much appreciated. Thanks in anticipation