Fig. 6

Waffle chart showing the versions’ misalignment of semantic artefacts available with version information on multiple (at least two) semantic catalogues. The misalignment is expressed as the proportion between the number of times in which each resource had a unique value and the number of catalogues in which the resource was available with a specified version. In the figure, each square represents a single semantic artefact (N = 177) and the proportion of misalignment varies from 0 (no existing misalignment among catalogues) to 1 (maximum misalignment among catalogues).