Themes and Tags are used to categorize resources. A theme can have multiple related tags and a tag can be associated with multiple themes.
Themes are intended to primarily map onto how Linaro’s projects are organised but they can be used to provide an umbrella grouping of various resources, e.g. all of the resources for an event.
Tags are intended to provide a grouping around technologies or subject-matter, e.g. “Demo”, “Keynote”, “IoT”.