Am 08.04.2020 um 14:19 schrieb Costello, Roger L. costello(_at_)mitre(_dot_)org:
Hi Folks,
I executed this XPath query in Oxygen:
//distinct-values(//Row[matches(Advertiser, 'TS3', 'i')]/Subscribers)
The two slashes at the beginning were an accident. At the bottom of the screen
Oxygen shows the matches. All of a sudden it showed 111,000 matches, then a
moment later 438,000 matches, and then finally 525,946 matches.
"Yikes!" I thought, "What is going on? There is supposed to be around 17 matches.
How can there be half a million matches?"
Then I saw the two slashes at the start.
"Hmm, what is the meaning of two slashes preceding the distinct-values
function?" I thought.
So, I ask you: what is the meaning of two slashes preceding the distinct-values
function? Why does its evaluation result in so many matches?
// is short for /descendant-or-self::node()/ so
//distinct-values(//Row[matches(Advertiser, 'TS3', 'i')]/Subscribers)
is
/descendant-or-self::node()/distinct-values(//Row[matches(Advertiser,
'TS3', 'i')]/Subscribers)
meaning it returns
distinct-values(//Row[matches(Advertiser, 'TS3', 'i')]/Subscribers)
as many times as the document has any nodes selectable by
/descendant-or-self::node().
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