Currently only OpenTM2 XLF variant is supported for import.
For several issues a more flexibel XLF import is needed, supporting all kinds of internal tags, not only <ph> tags.

Regarding the current implementation segments/transunits with the attribute translate="no" are not imported at all.
In the future segments with translate="no" should also be imported, only segments with no textual source content (only tags, empty) are ignored.