Support colon in bound attribute name

It would be nice, if I could bind an attribute, that has colon in its name (ex. "xmlns:xlink"). At this moment, when I write "xmlnsXlink:xmlns:xlink", the part after the second colon is ignored.
I've modified the code to split using only the first colon, but I have no idea, if what I'm doing is right and has any use. :D It's just a suggestion.