Again Phil thank you for being patient with me.
I'm also glad that I was able to help report a minor bug
It was my intention to use "xap" - the old name space of "xmp". If I could simplify my earlier question, what if I want to add a new tag in the current "xap" namespace?
Just to further illustrate what I have in mind, here's an example of the XMP I need to embed inside the image
