First, I'll thank you mouser -PM'creator  :up:!
I think that these errors

-"I cannot delete or modify entries?",
-"I get an error: could not be loaded by tinyxml lib - Error reading end tag" ...

are because we use non-english language for describe Item-Definitions!
I found: "XML Encoding" and "XML Syntax Rules"

For errors check here and edit your Item-Definitions-file:
XML-Validattor
or open in your browser.

Mouser, is this right? Can you do something to this?
Thank you!