woothemes/woocommerce — pull request #5904 by maxrice (2014-07-28 16:19:25+00:00)
Title: Remove XML response from v2 REST API

With the API supporting read/write for all resource types (and requiring JSON request bodies), I don't think we need to support XML responses anymore. The v1 API will still support XML. The response handler is still filterable so if a site really needs XML with the v2 API, it can be enabled again with custom code.