at a given position. A completion can also
be a incomplete in itself and content assist provides means to deal with
nested completions.
<h2>
Package Specification</h2>
<code>ISubjectControlContentAssistant</code> defines the concept of the content assist add-on.
It collaborates with content type specific completion processors (<code>ISubjectControlContentAssistProcessor</code>)
in order to generate completion proposals (<code>ICompletionProposal</code>)
valid at the current document position. The package pr