gistfile1.txt

Comma and semicolon

Use the comma (,) and semi-colon (;) characters to indicate nonhierarchical portions
of the URI. The semicolon convention is used to identify matrix parameters:

    http://www.example.org/co-ordinates;w=39.001409,z=-84.578201
    http://www.example.org/axis;x=0,y=9 

These characters are valid in the path and query portions of URIs, but not all code
libraries recognize the comma and semicolon as separators and may require custom
coding to extract these parameters.