"ARC is a flexible RDF system for semantic web and PHP practitioners." BSEditor: Introducing ARC2The Web is evolving from a collection of searchable documents to a repository of increasingly interlinked information Fragments. The data granularity is improving from"pages"and"files"to things like"persons","events", and"locations". New types of applications are appearing, and with them new requirements for software tools.RDF researchers have been working hard on specifications and solutions for this rising Web of Data, and we see adoption in a variety of areas. One community, however, is still under-represented, and (not so) funnily, it's the group of mainstream Web developers who kicked off data web trends like semantic markup, tagging, user-friendly information management, or mash-ups in the first place. Worse even, their great bootstrapping work towards a structured web is often not acknowledged and considered inferior to W3C-approved SemWeb specifications.With ARC, we would like to reach out to the larger Web developer community, to enable the Combination(!) of efforts like microformats with the utility of selected RDF solutions such as agile data storage, run-time model changes, standardized query Interfaces, and mashup chaining.ARC tries to keep things simple and flexible. All features are backed by practical use cases, we don't implement specs just for the sake of full compliance. Actually, one of the motivations behind ARC isn't even the creation of more semantic apps, but to bring RDF to everyday web development. The whole ARC website, for example, is based on RDF. Not because we needed semantics, but because RDF is a productivity booster which makes website implementation so much FASTER if it's used pragmatically.We hope you enjoy using ARC, and please don't hesitate to send in bug reports and feature suggestions.