Convert this version into a uniquely identifiable commit message. @return Commit Message identifying this version

Loads versions using given executor if they were not already loaded. Executor must be not <c>null</c>. @return A map containing all available versions

@param vertex Subject vertex @return Set of vertices containing all vertices u where the edge (v, u) is contained within this graph, for provided vert

@return Friendly version string, mostly in a human-readable format

A string that uniquely identifies this metadata provider. This string should be usable in a filesystem path @return Name that identifies this manifes

@return whether this version should <i>definitely</i> not appear in a main branch of the version graph

Find all vertices with in-degree of zero @return Set containing root vertices