There is no official documentation in the PowerBuilder syntax language that you see when editing the source. Most of the people we worked with simply had to use the trial version and error to figure this out. Previously, newsgroups asked about the syntax file, so parsing could be created for it, but it was never provided. Here is a message saying this
I believe that the next version of PowerBuilder will move away from this syntax to a more XML-based format (and switch from PBL as binary files to text format).
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