UK National Archives Discovery API - Developers

UK National Archives Discovery
The UK National Archives is the government's national archive for England, Wales, and the United Kingdom. Holding over 11 million historical government and public records, the Archives provides an online Catalogue, containing searchable descriptions of these records and documents. The Discovery service is based on the Catalogue and will soon replace the search functions of the Catalogue. Discovery service includes an API for RESTful queries, returning responses in XML.