Link titles looks like
[link](/uri "title") and corresponds to the title attribute of the “a” tag of HTML. It is often implemented as a help tip, shown when the mouse cursor hoover over the anchor text. It is not shown as a part of the main flow of text, and because of that it should generate a separate text-unit, just like title attributes in the a tag generates a separate translation unit when processed by the HTML Filter.
Currently, however, a line in a markdown file:
This is an [anchor text](http://google.com "This just opens the Google search page")]
<source xml:lang="en">This is an <g id="1">anchor text<x id="2"/>This just opens the Google search page</g>]</source>
in the generated XLIFF file. “This is an anchor text This just opens the Google search page” can’t be a single translation unit as it doesn’t make sense as a sentence.