Abstract: Methods and systems are described for identifying a matched tag set. In one aspect, a first resource is identified that is first tagged with a first tag associated with a first tagging criterion by a first matched tag and that is second tagged with the first tag associated with a second tagging criterion by a second matched tag. Selection information is received identifying the first tag. Based on the first tagging criterion, a first set is identified that includes at least one resource when the selection information identifies the first matched tag, wherein each resource in the first set is tagged with the first tag. Based on the second tagging criterion, a second resource, not included in the first set, is identified that is tagged with the first tag when the selection information identifies the second matched tag.

Abstract: Methods and systems are described for tagging a resource. In an aspect, a matched tag is created by associating a user identified tag with a tagging criterion that is based on data other than the tag. A determination is made that the tagging criterion is met for each resource in a plurality of resources. Each resource in the plurality is tagged with the tag, in response to the determining. Presentation information is sent to present, via an output device, a tag user interface element representing the tag, that represents the tag, as a target for a user input to initiate an operation that identifies a resource in the plurality.

Abstract: Methods and systems are described for distinguishing tags for a resource. In one aspect, a first resource is detected as tagged with a first matched tag that identifies the first tagging criterion and the first resource is detected as tagged with a second matched tag that identifies the second tagging criterion. The first matched tag is determined to identify a first tag. The second matched tag is determined to identify the first tag. First presentation information is sent to present, along with a resource user interface element that represents the first resource, a first tag user interface element that represents the first tag identified by the first matched tag and second presentation information is sent to present a second tag user interface element that represents the first tag identified by the second matched tag.