> When you've got a long list of configuration items, each of 
> which is optional, it's better to use <all> than <sequence> 
> -- <sequence> requires the items to occur in exactly the 
> order they're listed.
> 
> E.g., in nattraversalrules.xsd:
> 
>   <element name='info'>
>     <annotation>
>       <documentation>
>         Contains information about the state of the NAT 
> traversal feature 
>       </documentation>
>     </annotation>
>     <complexType>
>       <all>
>         <element ref='dmp:state' minOccurs='1' maxOccurs='1'/>
>         <element ref='dmp:behindnat' minOccurs='1' maxOccurs='1'/>
>         <element ref='dmp:useSTUN' minOccurs='1' maxOccurs='1'/>
>         <element ref='dmp:stun-server-address' minOccurs='0' 
> maxOccurs='1'/>
>         <element ref='dmp:rediscovery-time' minOccurs='0' 
> maxOccurs='1'/>        
>         <element ref='dmp:publicaddress' minOccurs='0' maxOccurs='1'/>
>         <element ref='dmp:publicport' minOccurs='0' 
> maxOccurs='1'/>        
>         <element ref='dmp:proxyhostport' minOccurs='1' maxOccurs='1'/>
>         <element ref='dmp:relayaggressiveness' minOccurs='1' 
> maxOccurs='1'/>        
>         <element ref='dmp:concurrentrelays' minOccurs='1' 
> maxOccurs='1'/>        
>         <element ref='dmp:mediarelayexternaladdress' 
> minOccurs='0' maxOccurs='1'/>        
>         <element ref='dmp:mediarelaynativeaddress' 
> minOccurs='1' maxOccurs='1'/>        
>         <element ref='dmp:mediarelayxml-rpc-port' 
> minOccurs='1' maxOccurs='1'/>        
>         <element ref='dmp:port-range' minOccurs='1' 
> maxOccurs='1'/>        
>         <element ref='dmp:log-level' minOccurs='0' 
> maxOccurs='1'/>        
>         <element ref='dmp:log-directory' minOccurs='0' 
> maxOccurs='1'/>        
>       </all>
>     </complexType>
>   </element>
> 
> Dale
> 

That is definitely what is required here.  Thanks for the tip!
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