From OpenHome

Here is the proposed request syntax:

Request  ::= "in" (Category) (Filter)* "report" ("value" Tag With* | "items" Give+ Sort*) Category  ::= "audio" | "video" | "photo" | "text" Filter  ::= Where | Search Where  ::= "where" Tag "=" Value Search  ::= "search" Value Give  ::= "give" Tag With* With  ::= "with" Tag Sort  ::= "sort" Tag Tag  ::= Text-Without-Spaces Value  ::= (Word | String) Word  ::= Text-Without-Spaces String  ::= '"' Text-Without-Double-Quotes '"' | "'" Text-Without-Quotes "'"