Hyperlinks to XLIFF
Hyperlinks consist of two parts: the visible part (displayed text) and the invisible part (link target). In some cases, there is also a text which is displayed as tooltip (mouse-over event).
Now let's see what Across does with hyperlinks.
As you can see, element with id=0 from translation unit id=3 refers to several translation units with following id: 6,7,8. The translation unit with id=10 contains the DisplayedText for the element above.
To translate the DisplayedText hyperlink property you should insert you translation into <target> element of translation unit with id=10.
Those referencing-property-type values are defined: DisplayedText, TooltipText, URL.
These elements (referencing another parts of a document) are written the described way for DocX, Doc, IDML and MIF formats for now.
Since MIF variable is normally used several times in a MIF document, the translation unit with variable DisplayedText will refer to the only one last referencing translation unit.