my action on aria and symbols

I made a pull request for my actions. See https://github.com/w3c/personalization-semantics/pull/55


Please let me know if you approve the changes!




Changes


In the appendix for ariaI added the aria examples, and a clarification on the section on additional roles that they would be landmark roles




In the symbol section
When there is more then one concept, multiple concepts can be referenced by separating them with white space. The order of multiple concepts should be subject predicate object. Both omissions and  multiple triples are allowed. 


I also changed the example to a bliss symbolic reference. The exact URL may change but this is after talking to Matt Lundalv and Russel Gavin from Bliss. Bliss is an international concept language for symbols and has a good base of classic concepts. The problem with wordnet is it is so large it is hard to map.


All the best

Lisa Seeman

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