XML:ID And Ethnicity - Multiple Attributes

I am trying to make sense out of the xml:id tag and its usage as an attribute definer. Reading the web doesn't offer anything but contradictions. It seems that some want it to go away, leaving no way to specify a common attributes, and just have a unique id be used.

This leaves a non-politically correct person, like myself perplexed. If several SVG or CSS components have a common attribute, how do I group these elements by attribute? It would appear that the HTML name is being deprecated, I assumed that xml:id would be its replacement.

I like to think of ethnicity in this regard. When I am asked my ID, I have a name. I also check the ethnicity of white. So, I have two distinct identifying characteristics.

In my example for utilizing a singular display canvas for tablets and HDTV screens, I have grouped several <g> elements with unique ids, but with the same common denominator xml:id. This allows the display of the elements to be controlled by id and a common xml:id attribute at the same time. Makes sense to me, but others disagree, such as Opera.

If xml:id is not meant to be used in this way, could someone try to explain how to keep the two identifiers, without using xml:id and without a complex javascript routine? Simplicity is best for me.

Example file works with Firefox, Chrome and IE, not with Opera.

http://sites.google.com/site/jcdsvg/use.svg 

Thanks;

James




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