The new 2015 BJCP style guidelines in XML, using as close as the same schema as possible to previous releases (2004, 2008)
The Beer Judge Certification Program (BJCP) puts out the style guidelines for beer as well as cider and mead. They've recently released a significant revision to their style guides, but so far only in PDF and Word format.
The new style guides added some extra standard paragraphs to the style descriptions as well as a Tags: section. The two new paragraphs are given the element tags <comparison> for "Style Comparison" and <entryinstructions> for "Entry Instructions" paragraphs. The style's tags are in a comma-separated list in a <tags> element.
The 2015 guidelines also renumbered all the styles from the 2008 version and added unnumbered sub-styles to a few styles (eg. 21B American IPA). Since the style and sub-style formats are identical I've used the <subcategory> tags for both. For sub-styles the id attribute is the parent style's number followed by "-some-label" to make id unique for every entry. (Example: Black IPA (aka Cascadian Dark Ale) gets id="21B-black")