The level 2 file preserves textual information as well as inline tag information and can be used with TMX level 2 supporting CAT tools.
OmegaT can import TMX files up to version 1.4b level 1 as well as level 2. Level 2 files imported in OmegaT will generate matches of the same level since OmegaT converts the TMX level 2 tags of the foreign TMX.