Interview transcriptions, field notes, observation protocols, diaries, historical or political documents, scanned brochures, and any kind of text you may be interested in.
However, you are not bound to data texts; you may analyze qualitative data which are not available as text transcriptions as, for example, tape recordings, video tapes, children's drawings, photographs, etc.
How to mark "units of meaning" if there are no text lines and line numbers? For example, a video machine's tape counter or time marks continually entered into the recording would serve perfectly as identifiers of a segment's beginning and ending; the coordinates of a grid could be used if you are going to analyze drawings.