Xpath: pure descendant-or-self axis does not work
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                 Key: JCR-2797
                 URL: https://issues.apache.org/jira/browse/JCR-2797
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core, xpath
            Reporter: Alexander Klimetschek


A pure descendant-or-self axis "//" does not work, albeit it is defined in JCR 
1.0, section 6.6.4.6. Running this query

/jcr:root/content//

returns an error:

Encountered "$" at line 1, column 38. Was expecting one of: "or" ... "and" ... 
"div" ... "idiv" ... "mod" ... "*" ... "return" ... "to" ... "where" ... 
"intersect" ... "union" ... "except" ... ... ... "/" ... "//" ... "=" ... "is" 
... "!=" ... "<=" ... "<<" ... ">=" ... ">>" ... "eq" ... "ne" ... "gt" ... 
"ge" ... "lt" ... "le" ... "<" ... ">" ... "-" ... "+" ... "|" ... "[" ... ... 
... ... ... "," ... ... ... for statement: for $v in /jcr:root/content// return 
$v

It only works in combination with another location step, like 
/jcr:root/content//* or /jcr:root/content//test. Tested this on a 2.2 snapshot, 
but I think it was actually never supported so far.

The use case comes up when searching for a property in a subtree of a certain 
node, where you want to include a property on that node directly as well, eg. 
/jcr:root/content//[...@my:prop = 'value']

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