can't validate xml with a schema

[Guest hagai]

Hi,I wrote an xml schema and an xml. I can't validate the xml against the schema, and I don't understand the error.This is the schema:

<?xml version="1.0" encoding="UTF-8"?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">	<xs:element name="MessageStream">		<xs:complexType>			<xs:sequence>				<xs:element name="APIMessage" type="APIMessage" maxOccurs="unbounded"/>			</xs:sequence>		</xs:complexType>	</xs:element>	<xs:complexType name="APIMessage" abstract="true">		<xs:attribute name="version" type="xs:float" use="required"/>	</xs:complexType>	<xs:complexType name="APISessionMessage" abstract="true">		<xs:complexContent>			<xs:extension base="APIMessage">				<xs:sequence>					<xs:element ref="UniqueID"/>				</xs:sequence>			</xs:extension>		</xs:complexContent>	</xs:complexType>	<xs:complexType name="AddMessageToConversation">		<xs:complexContent>			<xs:extension base="APISessionMessage">				<xs:sequence>					<xs:element ref="Text"/>				</xs:sequence>			</xs:extension>		</xs:complexContent>	</xs:complexType>	<xs:complexType name="MessageError">		<xs:complexContent>			<xs:extension base="APIMessage">				<xs:sequence>					<xs:element ref="EmbeddedMessage"/>				</xs:sequence>			</xs:extension>		</xs:complexContent>	</xs:complexType>	<xs:element name="UniqueID">		<xs:simpleType>			<xs:restriction base="xs:string">				<xs:pattern value="[a-zA-Z0-9]+@[a-zA-Z0-9]+@LP|GN"/>			</xs:restriction>		</xs:simpleType>	</xs:element>	<xs:element name="Text" type="xs:string"/>	<xs:element name="EmbeddedMessage">		<xs:complexType>			<xs:sequence>				<xs:any/>			</xs:sequence>		</xs:complexType>	</xs:element></xs:schema>

this is the xml:

<?xml version="1.0" encoding="UTF-8"?><!--Sample XML file generated by XMLSpy v2007 sp2 (http://www.altova.com)--><MessageStream xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="D:\test\xmlbeans\testschema.xsd">	<APIMessage xsi:type="MessageError" version="1.0">		<EmbeddedMessage>			<APIMessage xsi:type="AddMessageToConversation" version="1.0">				<UniqueID>12345@abcd@LP</UniqueID>				<Text>				       abcd				</Text>			</APIMessage>		</EmbeddedMessage>	</APIMessage></MessageStream>

I get an error on this line:

<APIMessage xsi:type="AddMessageToConversation" version="1.0">

the error is:while validating complex type {'anonymous'}, element <APIMessage> matched wildcard {##any}but no element declaration was found.Does anybody have an idea why this error occurs?Thanks,Hagai.