Dependency Linkage that uses Projection [CONNECT C++]

I am using MicroStation CONNECT version 10.16.03.11.

Through the normal Place Text dialog, there is the ability to place the text element with a relative association to another element (e.g., a line element).

In looking at the Attributes of the text element, I notice this...

Next, when placing a dimension element with these settings to label the length of a line...

I then notice these properties via the Attributes tab for the dimension element...

What type of association or dependency corresponds to this "Projection" version? For example, is it perhaps the mdlAssoc_createLinear function?