Seeing this worries me we'll see users creating XML strings, then
parsing them to get the desired query. I've seen this lots with
QueryParser, but it would be even more gross to see folks do this
with the XML syntax. So, here's my community service message for the
day.... if you're creating a query in code, don't use a parser, use
the Query subclasses API directly :)
The XMLQueryParser is a great thing for machine-machine
communication, though!
Erik
On Apr 6, 2006, at 10:08 AM, mark harwood wrote:
The XMLQueryParser in the contrib section also handles
Spans (as well as a few other Lucene queries/filters
not represented by the standard QueryParser).
Here's an example of a complex query from the JUnit
test ....
<?xml version="1.0" encoding="UTF-8"?>
<SpanOr fieldName="contents">
<SpanNear slop="8" inOrder="false" >
<SpanOr>
<SpanTerm>killed</SpanTerm>
<SpanTerm>died</SpanTerm>
<SpanTerm>dead</SpanTerm>
</SpanOr>
<SpanOr>
<!-- a less verbose way of declaring ORed
SpanTerms-->
<SpanOrTerms>miner miners</SpanOrTerms>
<SpanNear slop="6" inOrder="false">
<SpanTerm>mine</SpanTerm>
<SpanOrTerms>worker workers</SpanOrTerms>
</SpanNear>
</SpanOr>
</SpanNear>
<SpanFirst end="10">
<SpanOrTerms>fire burn</SpanOrTerms>
</SpanFirst>
</SpanOr>
--- Erik Hatcher <[EMAIL PROTECTED]> wrote:
On Apr 6, 2006, at 8:47 AM, Michael Dodson wrote:
Can phrase queries be nested the same way boolean
queries can be
nested?
Yes... using SpanNearQuery instead of PhraseQuery.
I want a user query to be translated into a
boolean query (say, x
AND (y OR z)), and I want those terms to be
within a certain
distance of each other (approximately within the
same sentence, so
the slop would be about 7). I then want to find
documents where
that phrase is within a certain distance of
another term (in this
case an image name). So in pseudo code I would
have something like
PhraseQuery query1
Set slop to 7
PhraseQuery query2
Set slop to 50
Add boolean terms to query1
Add query1 and imageName to query2
Search
I think I could break down my initial boolean
query and turn query1
into two phrase queries which are OR'ed together
(so have query1a
with "x AND y" with slop 7, and query1b with "x
AND z" and slop 7,
both added to a BooleanQuery) but I still need to
combine that
query with the image name in query2.
QueryParser itself does not support the SpanQuery
family, but the
surround query parser (see contrib/surround in the
codebase) does
using an alternate syntax. So depending on your
needs, you may need
to create some sort of parser to allow humans to
enter such queries.
Erik
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