Refs #2444 (for the biopax reader to create a couple of simple string node attributes: UNIPROT (primary AC if possible), NCBI GENE, GENE SYMBOL)
No need to cherry-pick this (it did not make it to the release branch anyway): reverted a change that introduced a new bug due to ‘.’ has to be part of the fileFormat in that specific case, e.g., “.xml” was there expected instead “xml”.