Any difference between capital and lowercase XML / RDF tag names?

Question

I noticed that the install.rdf files of firefox extensions have some capitalized tag names i.e. <Description>.

Will it make any difference if it was lowercased i.e. <description>?

The files are xml so I don't see the problem but just wondering.

Answer 1

Xml elements are case sensitive, and that it's just rdf:Description. So, yes, a well behaved program will fail if it can't find the information it needs.

This page states that you need to supply a valid install.rdf in your package, so my guess is that installation of the component will fail at some time if it can't find the minimal set of information.