I am studying
source2e.pdf and I have encountered something such as
<latexrelease>. I thought that they might be some sort of label to mark different parts of the LaTeX source -
* probably means the beginning of a part and
/ probably means the end of a part. But as I continued to read they just didn't make much sense to me. And I didn't find anything that explains the use of these labels in
source2e.pdf. The document just goes directly to the various
.dtx files after the contents, without any explanation of the notation used in the document.
(I don't know what tags are suitable for this question, so I just chose a tag randomly. Someone else might choose a more appropriate tag.)