XRFragment Grammar

    reserved    = gen-delims / sub-delims
    gen-delims  = "#" / "&"                      
    sub-delims  = "," / "|" / "="

Example: ://foo.com/my3d.asset#pos=1,0,0&prio=-5&t=0,100|100,200

Explanation
`x=1,2,3`	vector/coordinate argument e.g.
`x=foo\|bar	1,2,3
`https://x.co/1.gltf
`.mygroup`	query-alias for `class:mygroup`

Focus: hasslefree 3D vector-data (,), multi-protocol/fallback-linking & dynamic values (|), and CSS-piggybacking (.mygroup)

URI parser

icanhazcode? yes, see URI.hx

fragment URI starts with #
fragments are split by &
store key/values into a associative array or dynamic object
loop thru each fragment
for each fragment split on = to separate key/values
fragment-values are urlencoded (space becomes + using encodeUriComponent e.g.)
every recognized fragment key/value-pair is added to a central map/associative array/object

icanhazcode? yes, see Parser.hx the gist of it: