--- /dev/null
+<?php
+
+namespace Drupal\taxonomy\Plugin\migrate\source\d6;
+
+/**
+ * Source returning tids from the term_node table for the non-current revision.
+ *
+ * @MigrateSource(
+ * id = "d6_term_node_revision"
+ * )
+ */
+class TermNodeRevision extends TermNode {
+
+ /**
+ * {@inheritdoc}
+ */
+ const JOIN = 'tn.nid = n.nid AND tn.vid != n.vid';
+
+}