The RDF Web Applications Working Group has published the First Public Working Draft of the RDF Interfaces specification. The goal of the RDF Interfaces specification is to provide a common development environment for Web Applications that utilize structured data and RDF. It provides interfaces for creating and managing RDF Triples, Graphs, and Parsers. It also provides the basic building blocks for the upcoming RDF API and the recently published RDFa API. While RDF support is a priority, support for Microdata and Microformats are also provided through extensible-by-design interfaces for parsers and Graph storage. Since this is a First Public Working Draft, the document is expected to change over the coming months. We welcome feedback from the public community of Web Application on the group’s public list.