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 "'"