[Nml-wg] grouping

[Roman Łapacz]

Just to consider a possible alternative for grouping elements like 
PortGroup, LinkGroup  (and maybe  others). Just I'm thinking.

<port id="p1">
    ...
</port>
<port id="p2">
    ...
</port>
<port id="p3">
    ...
</port>



<collection:set id ="c1">
<port idRef="p1"/>
<port idRef="p2"/>
<port idRef="p3"/>
</collection:set>

<port idRef="c1"/> <- higher level port



<collection:set id ="c2">
<port idRef="p1"/>
<port idRef="p2"/>
<port idRef="p3"/>
</collection:set>

<node idRef="c2"/>)

Roman