A human can access them at the file properties:





You can search for getVersionIdentifiers() in the SDK and you will find e.g.

ScmVersionableIdentifierList versionIdentifiers = com.ibm.team.filesystem.cli.core.util.RepoUtil
                            .getVersionIdentifiers(
                                    scmService,
                                    Collections.singletonList(versionable.getStateId().getUuidValue()), config);


which looks like this:

    public static ScmVersionableIdentifierList getVersionIdentifiers(IScmRichClientRestService scmService, Collection<String> stateIds, IScmClientConfiguration config)
            throws FileSystemException {
        ParmsGetVersionableIdentifiers parms = new ParmsGetVersionableIdentifiers();
        parms.versionableStateIds = stateIds.toArray(new String[stateIds.size()]);
        ScmVersionableIdentifierList versionIdentifiers = null;
        try {
            versionIdentifiers = scmService.postGetVersionableIdentifiers(parms);
        } catch (TeamRepositoryException e) {
            throw StatusHelper.wrap(Messages.RepoUtil_CANNOT_DETERMINE_VERSION_IDS, e,
                    new IndentingPrintStream(config.getContext().stderr()));
        }

        return versionIdentifiers;
    }