Can a schema be validated against another schema

Hi Schema gurus,
 
I would like to know if a schema can be validated against another schema, as
with XML files ?
 
If not, I guess I'm doing something wrong ... Here is what I'm trying to
achieve :
 
A high-level schema defines what could be a document type as follows :
 
<?xml version="1.0" encoding="ISO-8859-1"?><xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:include schemaLocation="D:\projects\eDoc\MDED.xsd"/>

<xs:complexType name="Document">

<xs:sequence maxOccurs="unbounded">

<xs:element name="Element" type="MetaDataElement"/>

</xs:sequence>

</xs:complexType>

</xs:schema>