code: @Override
      public TagAttribute get(String ns, String localName) {
          if (ns != null && localName != null)
          	for (TagAttribute a:attrs)
          		if (localName.equals(a.getLocalName()))
          			if (ns.equals(a.getNamespace()))
          				return a;
          return null;
      }
docs: Find a TagAttribute that matches the passed namespace and local name.
  
  @param ns
  namespace of the desired attribute
  @param localName
  local name of the attribute
  @return a TagAttribute found, otherwise null