Hi Fabrice thank you for the quick reply.
Unfortunately I do not understand what you mean. I have queried other XPath
codes with the number() function and the begin attribute without fault.
However, it does seem to point in that direction as the error explicitly
mentions that attribute:
attribute begin {"6"},
Because other lines in the benchmark with the number() function and begin
attribute do not throw this error, I do not know where to look.
Van: Fabrice ETANCHAUD [mailto:[email protected]]
Verzonden: vrijdag 3 maart 2017 12:33
Aan: Bram Vanroy <[email protected]>; 'BaseX'
<[email protected]>
Onderwerp: RE: [basex-talk] [XPTY0004] Item expected, sequence found
Hi Bram
>From what one can read there :
http://docs.basex.org/wiki/XQuery_Errors
It seems to me that number() function could be called with a sequence of
@begin.
There might be a place in your query where multiple node elements are
returned, leading to a node/@begin sequence.
Best regards,
Fabrice
De : [email protected]
<mailto:[email protected]>
[mailto:[email protected]] De la part de Bram
Vanroy
Envoyé : vendredi 3 mars 2017 12:19
À : 'BaseX' <[email protected]
<mailto:[email protected]> >
Objet : [basex-talk] [XPTY0004] Item expected, sequence found
Hi BaseX peeps
Im running BaseX 8.6.1 on Windows, and Im running into an issue I cant
explain. I am using BaseX to run some benchmarks. As a benchmark I am
running different XPath structures to match on the same database. In other
words, in a file of a hundred lines each line is an XPath structure, and
with Perl I query each line and measure the time it takes. Simple enough,
right?
The strange thing is that my script runs fine but it crashes on line 17,
which is this XPath code:
//node[@cat="pp" and node[@rel="hd" and @pt="vz" and number(@begin) <
number(../node[@rel="obj1" and @cat="np"]/node[@rel="mod" and
@cat="pp"]/node[@rel="hd" and @pt="vz"]/@begin)] and node[@rel="obj1" and
@cat="np" and node[@rel="mod" and @cat="pp" and node[@rel="hd" and @pt="vz"
and number(@begin) < number(../node[@rel="obj1" and
@cat="np"]/node[@rel="mod" and @cat="pp"]/node[@rel="hd" and
@pt="vz"]/@begin)] and node[@rel="obj1" and @cat="np" and node[@rel="mod"
and @cat="pp" and node[@rel="hd" and @pt="vz"]]]]]]
Admittedly, its quite a long string, but I dont see anything wrong with it
and I dont think the error lies in the XPath. The full trace is like
follows:
[XPTY0004] Item expected, sequence found: (attribute begin {"6"}, ...). at
C:\xampp\htdocs\grinding\BaseXClient.pm line 213.
at C:\xampp\htdocs\grinding\BaseXClient.pm line 213.
Query::exc("\x{5}", 133) called at
C:\xampp\htdocs\grinding\BaseXClient.pm line 177
Query::execute(Query=HASH(0x3adac40)) called at SonarBenchNew.pl
line 249
main::query_sonar("for \$node in
db:open(\"WRPEE0000000treebank\")/treebank//node[\@"...) called at
SonarBenchNew.pl line 176
main::loop_databases(ARRAY(0x31a2ae0), "//node[\@cat=\"pp\" and
node[\@rel=\"hd\" and \@pt=\"vz\" and number(\@"...) called at
SonarBenchNew.pl line 140
main::regular_sonar("//node[\@cat=\"pp\" and node[\@rel=\"hd\" and
\@pt=\"vz\" and number(\@"...) called at SonarBenchNew.pl line 110
I have found that the XPTY0004 error is often caused by an order-by clause
in XQuery but I dont have that. The full XQuery for the XPath is as
follows:
for $node in db:open("WRPEE0000000treebank")/treebank//node[@cat="pp" and
node[@rel="hd" and @pt="vz" and number(@begin) < number(../node[@rel="obj1"
and @cat="np"]/node[@rel="mod" and @cat="pp"]/node[@rel="hd" and
@pt="vz"]/@begin)] and node[@rel="obj1" and @cat="np" and node[@rel="mod"
and @cat="pp" and node[@rel="hd" and @pt="vz" and number(@begin) <
number(../node[@rel="obj1" and @cat="np"]/node[@rel="mod" and
@cat="pp"]/node[@rel="hd" and @pt="vz"]/@begin)] and node[@rel="obj1" and
@cat="np" and node[@rel="mod" and @cat="pp" and node[@rel="hd" and
@pt="vz"]]]]]]let $sentid := ($node/ancestor::alpino_ds/@id)let $sentence :=
($node/ancestor::alpino_ds/sentence)let $tb := \'WRPEE0000000treebank\'
return <match>{data($sentid)}||{data($sentence)}||{data($tb)}</match>
I dont know if you guys can give me directions solely based on this. But if
you could point me to a likely cause, e.g. input OR database contents, that
would be great.
Thanks in advance!
Bram Vanroy
https://bramvanroy.be
