Rendering of <abbreviated-form> elements

The <abbreviated-form> element is designed to work with glossary entry topics in specific ways.

The design intent is that processors use the following logic:

When a processor encounters an <abbreviated-form> element that references a DITA topic, if the referenced topic is not a <glossentry> topic or a specialization of <glossentry>, the title of the topic SHOULD be rendered.

When a processor encounters an <abbreviated-form> element that references a DITA topic, if the referenced topic is a <glossentry> topic or a specialization of <glossentry>, processors SHOULD render the <abbreviated-form> element in the following ways:
First usage
Render the contents of the <glossSurfaceForm> elements, if it is not empty. If the <glossSurfaceForm> is empty or does not exist, render the contents of the <glossterm> element.
Second and later usage
Render the contents of the <glossAcronym> elements, if it is not empty. If the <glossAcronym> is empty or does not exist, render the contents of the <glossterm> element.

See the examples in the element-reference topic for the <abbreviated-form> element.