A followup:
I validated the posted document against the xsd using the following link:
http://apps.gotdotnet.com/xmltools/xsdvalidator/Default.aspx

It was OK. So is it a bug in the VS.net 2003, or i was doing sth wrong?

Thanks


"peter" wrote:

> Hi everyone,
> 
> i have a simple xml document and its xsd as attached below. When i try to 
> validate the xml in VS.net 2003 by clicking [XML->Validate XML Data] menu, I 
> got the error: 
> C:\PlantStructure.xml(1): The 'urn:myschema-aprs:PlantStructure' element is 
> not declared. An error occurred at , (1, 2).
> C:\PlantStructure.xml(1): Visual Studio could not locate a schema for this 
> document. Validation can only ensure this is a well formed XML document and 
> cannot validate the data against a schema.
> ...
> 
> Both files are localed under c:\ 
> My VS.net 2003 build number is 7.1.3088, and .net framework is 1.1.4322
> 
> Can anyone help me to figure it out?
> Thanks
> 
> PlantStructure.xsd:
> <?xml version="1.0"?>
> <xsd:schema id="aprs" targetNamespace="urn:myschema-aprs" 
> xmlns="urn:myschema-aprs" xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
> xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" 
> attributeFormDefault="unqualified" elementFormDefault="qualified">
> 	<xsd:simpleType name="ItemTag">
> 		<xsd:restriction base="xsd:string">
> 			<xsd:minLength value="0"/>
> 			<xsd:maxLength value="100"/>
> 		</xsd:restriction>
> 	</xsd:simpleType>
> 	<xsd:simpleType name="Active">
> 		<xsd:restriction base="xsd:int">
> 			<xsd:minInclusive value="0"/>
> 			<xsd:maxInclusive value="1"/>
> 		</xsd:restriction>
> 	</xsd:simpleType>
> 	<xsd:simpleType name="ObjectType">
> 		<xsd:restriction base="xsd:int">
> 			<xsd:minInclusive value="1"/>
> 			<xsd:maxInclusive value="2"/>
> 		</xsd:restriction>
> 	</xsd:simpleType>
> 	<xsd:simpleType name="ObjectName">
> 		<xsd:restriction base="xsd:string">
> 			<xsd:minLength value="0"/>
> 			<xsd:maxLength value="50"/>
> 		</xsd:restriction>
> 	</xsd:simpleType>
> 	
>   <xsd:element name="PlantStructure" msdata:IsDataSet="true" 
> msdata:EnforceConstraints="False">
>     <xsd:complexType>
>       <xsd:choice maxOccurs="unbounded">
>         <xsd:element name="Object">
>           <xsd:complexType>
>             <xsd:attribute name="ObjectID" type="ItemTag" />
>             <xsd:attribute name="ObjectType" type="ObjectType" />
>             <xsd:attribute name="ParentID" type="ItemTag" />
>             <xsd:attribute name="ObjectName" type="ObjectName" />
>             <xsd:attribute name="Active" type="Active" />
>           </xsd:complexType>
>         </xsd:element>
>       </xsd:choice>
>     </xsd:complexType>
>   </xsd:element>
> </xsd:schema>
> 
> 
> PlantStructure.xml:
> 
> <PlantStructure xmlns="urn:myschema-aprs" 
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> 	xsi:schemaLocation="urn:myschema-aprs PlantStructure.xsd">
> 	<Object ObjectID="./2.1/2.1" ObjectType="1" ParentID="" ObjectName="My 
> plant" Active="1" />
> 	<Object ObjectID="./2.6/2.6" ObjectType="1" ParentID="./2.1/2.1" 
> ObjectName="Line 1" 	Active="1" />
> 	<Object ObjectID="./2.2/2.2" ObjectType="1" ParentID="./2.6/2.6" 
> ObjectName="Loop 1" Active="1" />
> 	<Object ObjectID="./2.3/2.3" ObjectType="1" ParentID="./2.6/2.6" 
> ObjectName="Loop 2" Active="1" />
> 	<Object ObjectID="./2.4/2.4" ObjectType="1" ParentID="./2.6/2.6" 
> ObjectName="Loop 3" Active="1" />
> </PlantStructure>
>