Qualitative data (textual, video, audio or still-image) originally produced for other purposes into quantitative data (expressed in unit-by-variable matrices) by using coding techniques in accordance with pre-defined categorization schemes. For example, coded party manifesto data like the "European Parliament Election Study 2009, Manifesto Study" (doi:10.4232/1.10204)". [Source: Adapted from https://ddialliance.org/Specification/DDI-CV/ModeOfCollection_3.0.html]
http://purl.org/coar/resource_type/AM6W-6QAW