1. A method comprising: accessing first data defining multiple portions of a content item, wherein at least a plurality of the portions represent text; selecting, from the plurality of portions representing text, a subset of the portions representing text, wherein the selecting is based on each portion of the selected subset having a particular characteristic; based on the text represented by the portions of the selected subset, generating second data that represents a concatenation of the text represented by the portions of the selected subset; and providing output based on the generated second data.