The more valuable data is to users and developers, the more likely it is that a community will form and more active engagement will follow as more value is derived from the data. One notable example in the UK has been the release and multiple re-use of real-time public travel information,from trains to buses. Public datasets are becoming more widely available in machine-readable formats, often in real-time, directly sourced from live systems, or, if not, exported and refreshed frequently when new data become available. Metadata, such as the information presented, collection method, timeliness, quality and other contextual information is crucial to allowing data consumers to not only understand available data, but to put them to appropriate use.