OpenSearch

Hey, look at that, search results in XML. How RESTful. They only added totalResults and some pagination data. Much better than I had hoped for and written about last year

A9.com OpenSearch

Ooh, ooh! They defined a service language via a URI generative grammar - which means a URI syntax with curly brace expansion macros! I hope this catches on as a syntax. Something is better than nothing. Here's an example

http://beta.indeed.com/opensearch?q={searchTerms}&start={startIndex}&limit={count}