in src/main/scala/org/apache/daffodil/DaffodilPlugin.scala [112:119]
def filterVersions[T](version: String, mappings: Map[String, T]): Seq[T] = {
val vn = VersionNumber(version)
val filteredValues = mappings
.filterKeys { semSel => SemanticSelector(semSel).matches(vn) }
.values
.toSeq
filteredValues
}