Hi all,
My real question is how to remove the added document from the system.
pf:delete-doc does not seem to exist (?)
My second question is how one could have known that the shred_doc interface is
deprecated? It is not mentioned on the web, and I cannot even find a test using
pf:add-doc... maybe I am looking in the wrong place for documentation?
Cheers,
Arjen
| On Mon, Feb 05, 2007 at 09:08:59PM +0100, Martijn Faassen wrote:
|
| > First, I was testing the xquery support. I tried to shred a document
| > like this:
| >
| > shred_doc('/home/faassen/xml/shaks/hamlet.xml', 'hamlet')
|
| shred_doc() is actually a deprecated interface to MonetDB/XQuery's
| document management. In the meantime we integrated document management
| into the query language itself, so you will no longer need to work with
| MIL for the document management and XQuery for the queries.
|
| The recommended way to load documents into MonetDB/XQuery is now the
| (XQuery) function pf:add-doc():
|
| pf:add-doc (URI, alias) -> load document from URI and store it under
| the name alias (similar to shred_doc())
|
| pf:add-doc (URI, alias, coll) -> same, but add document to the
| collection coll
|
| pf:add-doc (URI, alias, pct) -> leave pct % free space for future
| updates
|
| The latter two variants can have performance advantages depending on
| your scenario.
|
| Note that if you want to use shred_doc() in MIL, you need to specify
| both arguments as MIL strings, i.e., in double quotes.
|
| > doc('/home/faassen/xml/shaks/hamlet.xml')//FM
| >
| > and this gets a step further (still wondering why the former didn't
| > work, though):
| >
| > MAPI = [EMAIL PROTECTED]:50000
| > QUERY = doc('/home/faassen/xml/shaks/hamlet.xml')//FM
| > ERROR = !ERROR: I/O warning : failed to load external entity "play.dtd"
| > !ERROR: [shred_url]: 1 times inserted nil due to errors at
| > [...]
| >
| > The play.dtd is in the directory next to 'hamlet.xml', so don't know why
| > that doesn't work either.
|
| Sorry, I currently don't know what could have gone wrong here. Anyone
| else on the list can give an answer?
|
| MonetDB/XQuery, by the way, uses DTDs to know about ID and IDREF
| attributes. The id() and idref() functions will only be supported if ID
| and IDREF attributes have been declared in the DTD. (Also, an
| additional index will be created to efficiently back id() and idref().)
|
| > Next, I was trying out the xquery update support. Not hindered by any
| > knowledge on how it works, I went to the referenced W3C document and
| > adapted the first insert statement I saw there into this:
| >
| > do insert <year>2005</year>
| > after fn:doc('/home/faassen/xml/shaks/hamlet2.xml')/PLAY/TITLE
| >
| > This however gives me an error message I do not understand:
| >
| > MAPI = [EMAIL PROTECTED]:50000
| > QUERY = do insert <year>2005</year>
| > after fn:doc('/home/faassen/xml/shaks/hamlet2.xml')/PLAY/TITLE
| > ERROR = !type error: no variant of function upd:insertAfter accepts the
| > given argument type(s): element TITLE { item* }*; (node* | node)*
| > !type error: maybe you meant:
| > !type error: upd:insertAfter (node, node*) as stmt
| > !type error: illegal arguments for function upd:insertAfter
|
| The problem is that the expression `fn:doc(...)/PLAY/TITLE' could
| evaluate to a list of nodes. The `do insert ... after ...' clause,
| however, is only allowed for single nodes as the target expression.
|
| The Pathfinder XQuery compiler does static type checking. And if your
| query is not type-safe it will be rejected. If you are sure that your
| path evaluates to exactly one node, you can tell that to the compiler
| and it will (at least it should ;-)) accept your query:
|
| do insert ... after exactly-one (fn:doc (...)/PLAY/TITLE)
|
| Other way to make sure that the target expression evaluates to exactly
| one node include
|
| for $n in fn:doc (...)/PLAY/TITLE return
| do insert ... after $n
|
| I hope I could help you a bit. Don't hesitate to ask again.
|
| Jens
|
| --
| Jens Teubner
| Technische Universitaet Muenchen, Department of Informatics
| D-85748 Garching, Germany
| Tel: +49 89 289-17259 Fax: +49 89 289-17263
|
| XQuery processing at the speed of light: MonetDB/XQuery
| http://www.monetdb-xquery.org/ http://www.pathfinder-xquery.org/
|
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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier.
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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