> For the complete documentation index, see [llms.txt](https://omalab.gitbook.io/engineeringwiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://omalab.gitbook.io/engineeringwiki/gemslibraries/blackbook.md).

# Blackbook

[Blackbook](http://www.github.com/omalab/blackbook) is a gem that does HTML parsing. Based on a URL, Blackbook will detect which parser should be used for the page (using Allusion). From there, the system will take this proprietary page and parse it. If the page doesn't have a match, it will use our generic HTML parser to extract the page and return a hash-based response.