MISSING_BLOCK_LABEL

[Randy Daal]

I just decompiled a bookmarks portlet I want to edit.
But I already got my first problem.

break MISSING_BLOCK_LABEL_199;

I can't find any information about it and how it works
it is used for pattern matching

hope someone can tell me a little bit more about this
or could direct to a site with some information about it

thank you