Hi Debora,

If you know all the elements that can go inside filters then you can 
just have a choice model group that contains all the elements and set 
the occurrence on the choice model group to one or more:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:element name="filters">
     <xs:complexType>
       <xs:choice maxOccurs="unbounded">
         <xs:element name="high"/>
         <xs:element name="medium"/>
         <xs:element name="low"/>
       </xs:choice>
     </xs:complexType>
   </xs:element>
</xs:schema>

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
www.---.com


Debora Vanni wrote:
> Sorry to bother you again,
> I try to look around but I can't find a solution.
> I would like to know if there is some way in XSD to say that a complex
> element should be composed by any but at least one element of a group(=
> some) of elements.
> For example:
> the group is :
> 	<high></high>
> 	<medium></medium>
> 	<low></low>
> 
> This is CORRECT:
> <filters>
> 	<high></high>
> 	<medium></medium>
> 	<low></low>
> </filters>
> 
> This is CORRECT:
> <filters>
> 	<high></high>
> 	<low></low>
> </filters>
> 
> This is INCORRECT:
> <filters>
> 
> </filters>
> I know the maximum number of elements of the group but I don't know
> which and how many they could choose. Everything it's ok but there
> should be at least one!
> Thank you for you help
> Debora Vanni
> 
> 
> 
> 

From Philippe.Poulard@s... Tue May 23 13:37:11 2006
Received: from maggie.w3.org ([19