On Dec 4, 2005, at 11:02 AM, Paul Elschot wrote:
Are there XML editors that can limit their output to a given
stylesheet?
In that case one only needs to predefine a style sheet for queries.
Yes, there are many sophisticated XML editors. I'm not quite sure
where you're going with this though.
Almost all users want to enter "words separated by spaces", and very
little else. QueryParser succeeds fine for this purpose.
Those are not the users that I'm thinking of.
Those are some highly specialized users :)
I think we should focus on the machine-to-machine use case of
communicating a Query in this discussion.
That's ok, but when a few simple constraints are enough to
make it useful for humans that need the extra query power
enough to be willing to enter more syntax, then why not?
I agree with the sentiment, truly. And I'm quite open to QueryParser
itself being expanded to support more sophisticated queries if the
additional syntax still allows the more common simpler TermQuery/
PhraseQuery/BooleanQuery cases.
I just don't think its very practical to come up with such syntax and
have any kind of consensus on it across the majority of Lucene
users. QueryParser is surely embedded in many applications and
exposing querying capability that the application developers may not
be aware is possible. Field selection itself is even questionable in
the general sense.
In short, QueryParser is a double-edged sword - powerful, but perhaps
too powerful. Simple in one sense, but too complicated when digging
deeper. I could almost be bold enough to claim that each application
should build this kind of parsing in a custom way.
I don't know XML that well. Does it have a facility to allow
different roles
for nested constructs?
I'm not following what you mean by different roles. Could you
provide an example.
For example the clauses in a boolean query can have these roles:
required, optional, and excluded.
Thinking about it, this would probably map to sth like:
<BooleanQuery>
<BooleanClause role="required">
<SomeSubQuery/>
</BooleanClause>
<!-- more clauses -->
</BooleanQuery>
Is it possible in XML to predefine rc so that <rc>...</rc> means:
<BooleanClause role="required">...</BooleanClause> ?
Only via DTD/XSD could this be done, but that is way overkill and too
complicated for our purposes. For the general XML case, make it
verbose specifying everything with no shortcuts like this. The flags
should be spelled out explicitly for <BooleanClause>. If someone
wants a shortcut XML syntax, that is where XSLT could come in, possibly.
"role" seems too generic here. I recommend something like
occur="must/should/mustnot" which maps to the API more precisely.
Erik
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
