URI functions: Tracker SPARQL Library Reference Manual

## URI functions

### tracker:uri-is-parent

    	tracker:uri-is-parent (?parent, ?uri)

Returns a boolean value expressing whether `?parent` is a parent of `?uri`.

### tracker:uri-is-descendant

    	tracker:uri-is-descendant (?uri1, ?uri2, ..., ?uriN, ?child)

Returns a boolean value expressing whether one of the given URIs are a parent (direct or indirect) of `?child`.

### tracker:string-from-filename

    	tracker:string-from-filename (?filename)

Returns a UTF-8 string from a filename.