2. The translation apparatus as set forth in claim 1 , wherein the comparator (i) computes a textual similarity value based on the textual comparison and (ii) computes a structural similarity value based on the structural comparison.
2. The translation apparatus as set forth in claim 1 , wherein the comparator (i) computes a textual similarity value based on the textual comparison and (ii) computes a structural similarity value based on the structural comparison. 6. The translation apparatus as set forth in claim 2 , wherein the structural similarity value includes an outer structure similarity value indicating similarity between: an outer path between the identified structural position and a root of the source language document from which the new source language translation unit was derived, and corresponding structural information for the source language translation unit stored in the translation memory.