Vikas Saurabh commented on OAK-5051:

Btw, on [~chetanm]'s (offline) request, here's published page - 

[~tmueller], btw, once you get around to check it out, I would like to mention 
a few things:
* the macro loads the grammar csv, but renders only what's requested (it 
doesn't load the csv every time as one site plugin activation instantiates one 
instance of the macro)
* renamed {{grammar-xpath.md}} to {{grammar-xpath.md.vm}} as that allowed me to 
put grammar csv in {{oak-doc}} project instead of an embedded resource in 
{{oak-doc-railroad-macro}} project
** it has a minor downside though - since velocity reserves {{#}} for its own 
macro language, so I had to utilize a small hack to bring up Markdown's 
headings (which are {{#}}, or {{##}}, etc)
* while, I'm pretty happy with the current impl of macro and how it's reading 
grammar csv (from consuming project), we still need to review:
** grammar
** nomenclature of new class and packages

> Document XPath (and SQL-2) syntax as supported by Oak
> -----------------------------------------------------
>                 Key: OAK-5051
>                 URL: https://issues.apache.org/jira/browse/OAK-5051
>             Project: Jackrabbit Oak
>          Issue Type: Documentation
>          Components: query
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>            Priority: Major
> The JCR 2.0 SQL-2 language is documented at 
> http://h2database.com/jcr/grammar.html
> But extensions to that are not documented. And XPath (as supported by Oak) is 
> not documented at all.
> It would be good to have such a documentation, with examples.

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