It would be nice to support uri: prefixes in link types (right now we have url: and path: but it would be nicer to have a URI one for URIs, e.g. "sip" protocol (sip:XXXXX), see https://forum.xwiki.org/t/creating-sip-links-for-cti-software/14323/3

path: works but it's not made for this and is not semantic.