+ /*
+ * GFF3 spec requires comma, equals, semi-colon, tab, percent characters to be
+ * encoded as %2C, %3D, %3B, %09, %25 respectively within data values
+ * see https://github.com/The-Sequence-Ontology/Specifications/blob/master/gff3.md
+ */
+ final String GFF_ENCODABLE = ",=;\t%";