part_of has regexp Proteomics Standards Initiative Mass Spectrometry Vocabularies specification document extension version MS:1003372 MS The versioning of a an extension to a specification document that the current file requires to be read correctly. The version should encode the name of the extension, and some ordinal expression of its revision, preferably in semantic versioning notation. Signals that readers that do not know this extension should return an appropriately informative error if they do not think they can or should try to interpret the file. semantic version regexp