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 "'"