September 2011 - BaseX-Talk - mailman.uni-konstanz.de

NPE Error in GUI 6.7.1
by Randy reed 25 Sep '11

25 Sep '11

HI all, I am running basex 6.7.1 on Ubuntu 10.10 using the .jar module running on OpenJDK runtime 6b20-1.9.9. I received an NPE in the GUI (message below). I have attached my .xq file for your perusal. Let me know if there is any way to work around this, or if downloading a different build will solve it. Thanks so much Error: Potential bug? Improper use? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 6.7.1 Java: Sun Microsystems Inc., 1.6.0_26 OS: Linux, i386 Stack Trace: java.lang.NullPointerException org.basex.util.Token.token(Token.java:152) org.basex.query.item.DTd.<init>(DTd.java:103) org.basex.query.item.AtomType$31.e(AtomType.java:441) org.basex.query.item.SeqType.cast(SeqType.java:303) org.basex.query.expr.Cast.item(Cast.java:57) org.basex.query.expr.Arith.item(Arith.java:54) org.basex.query.expr.ParseExpr.value(ParseExpr.java:73) org.basex.query.expr.UserFunc.value(UserFunc.java:121) org.basex.query.expr.BaseFuncCall.value(BaseFuncCall.java:60) org.basex.query.expr.Let$1.next(Let.java:90) org.basex.query.expr.FLWR$1.next(FLWR.java:62) org.basex.query.iter.Iter.finish(Iter.java:65) org.basex.query.expr.ParseExpr.value(ParseExpr.java:76) org.basex.query.expr.UserFunc.value(UserFunc.java:121) org.basex.query.expr.BaseFuncCall.value(BaseFuncCall.java:60) org.basex.query.expr.Let$1.next(Let.java:90) org.basex.query.expr.FLWR$1.next(FLWR.java:62) org.basex.query.iter.Iter.finish(Iter.java:65) org.basex.query.expr.ParseExpr.value(ParseExpr.java:76) org.basex.query.expr.UserFunc.value(UserFunc.java:121) org.basex.query.expr.BaseFuncCall.value(BaseFuncCall.java:60) org.basex.query.expr.BaseFuncCall.iter(BaseFuncCall.java:73) org.basex.query.QueryContext.iter(QueryContext.java:351) org.basex.query.func.FNGen.data(FNGen.java:110) org.basex.query.func.FNGen.iter(FNGen.java:66) org.basex.query.QueryContext.iter(QueryContext.java:351) org.basex.query.expr.Constr.<init>(Constr.java:54) org.basex.query.expr.CElem.item(CElem.java:117) org.basex.query.expr.CElem.item(CElem.java:1) org.basex.query.expr.CFrag.item(CFrag.java:1) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:54) org.basex.query.QueryContext.iter(QueryContext.java:351) org.basex.query.expr.Constr.<init>(Constr.java:54) org.basex.query.expr.CElem.item(CElem.java:117) org.basex.query.expr.CElem.item(CElem.java:1) org.basex.query.expr.CFrag.item(CFrag.java:1) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:54) org.basex.query.QueryContext.iter(QueryContext.java:351) org.basex.query.expr.List$1.next(List.java:81) org.basex.query.expr.FLWR$1.next(FLWR.java:58) org.basex.query.expr.Constr.<init>(Constr.java:55) org.basex.query.expr.CElem.item(CElem.java:117) org.basex.query.expr.CElem.item(CElem.java:1) org.basex.query.expr.CFrag.item(CFrag.java:1) org.basex.query.expr.ParseExpr.iter(ParseExpr.java:54) org.basex.query.QueryContext.iter(QueryContext.java:351) org.basex.query.QueryContext.iter(QueryContext.java:301) org.basex.query.QueryContext.eval(QueryContext.java:260) org.basex.query.QueryProcessor.execute(QueryProcessor.java:128) org.basex.core.cmd.AQuery.query(AQuery.java:83) org.basex.core.cmd.XQuery.run(XQuery.java:22) org.basex.core.Command.run(Command.java:320) org.basex.core.Command.exec(Command.java:301) org.basex.core.Command.execute(Command.java:73) org.basex.gui.GUI.exec(GUI.java:410) org.basex.gui.GUI$5.run(GUI.java:358) -- Dr. Randall Reed Assistant Professor, Dept. of Philosophy and Religion Appalachian State University

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BaseX/REST: Update
by Christian Grün 25 Sep '11

25 Sep '11

Hi there, once more, our integrated REST implementation has been updated (the Wiki should reflect all changes [1]), and should soon reach its final state: - POST is now limited to only perform operations (query, run or command) - Resources can now be returned via GET by simply specifying their exact path - Binary resources are returned with the correct content type - PUT can also be used to store binary files - The HTTP Server now starts the BaseX Server by default Your feedback, be it public or private, is welcome as usual, Christian [1] http://docs.basex.org/wiki/REST ___________________________ BaseX Team Christian Grün Uni KN, Box 188 D-78457 Konstanz http://www.basex.org

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Passing XML data to a query
by Ralf Jung 24 Sep '11

24 Sep '11

Hi list, I am currently looking into BaseX to find out if it meets my requirements for an XML database with XQuery implementation and REST interface. I already got the data imported, now I'm looking into the queries I need. I just stumbled upon the following problem, and could not find any documentation to overcome it, just a bug report that I think is related (https://github.com/BaseXdb/jax-rx/issues/3) The problem is that I need to work on XML data that is POSTed to the query, the data must be available during query execution. However I could not find a way to do so, the jax-rx parameters seem to be restricted to atomic values. Did I miss anything? As work-around, I tried to construct the entire query in the database client (which in my case is Orbeon, the runtime for the XForms application that serves as user interface), serializing the XML into a string and making it part of the query, i.e. something like let $data = <xsl:value-of select="saxon:serialize($data)"/> The query is created correctly, however, I can not get it to execute on the server as BaseX requires a content-type of application/query+xml, whereas XForms submissions (the only way to issue POST requests from Orbeon) have a content-type of application/xml. Is there any way to pass an XML data parameter, or at least to send a custom query without using a special mime-type? Any help would be appreciated, Ralf

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Schema validation
by Ralf Jung 24 Sep '11

24 Sep '11

Hi list, I noticed in the docs that BaseX currently does not support any form of XML Schema validation. Are there any plans to implement this, and in which timeframe? I'd especially be interested in requiring validation for a database, so that BaseX refuses to store documents that do not conform to an XMLSchema. Don't worry, I understand this is open-source and free and all, I just want to know what the plans are :) Kind regards, Ralf

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multiple updates in a transform query
by Sony Vijay 23 Sep '11

23 Sep '11

Hi, Given the following xquery: import module namespace functx = "http://www.functx.com" at " http://www.xqueryfunctions.com/xq/functx-1.0-nodoc-2007-01.xq"; declare variable $entryid_prefix as xs:string external; declare variable $src_prefix as xs:string external; declare variable $other_src_prefix as xs:string external; let $feeds_metadoc := <feed> <entry> <id>1</id> <child src='2' /> <child src='libx.org(a)gmail.com/core' /> </entry> </feed> return( copy $feed_copy := $feeds_metadoc modify ( for $entry in $feed_copy/entry return ( for $entry_id in $entry/id where fn:not(fn:contains($entry_id, '/')) return replace value of node $entry_id with concat($entryid_prefix, $entry_id) for $src in $entry/child/@src return ( if (fn:contains(data($src), '/')) then ( let $src_id_new := concat($other_srcprefix, $src_id) return replace value of node $src with $src_id_new ) else ( let $src_data := concat($src_prefix, data($src)) return replace value of node $src with $src_data ) ) ) ) return $feed_copy ) Say, the values are passed are - $entryid_prefix = 'http://X/", $src_prefix="http://Y/", and $other_src_prefix="http://Z/". After running the above xqueries by passing these values, I expect the output to be: <feed> <entry> <id>http://X/1</id> <child src='http://Y/2' /> <child src='http://Z/libx.org@gmail.com/core' /> </entry> </feed> I am trying to use multiple for statements within the modify statement and this does not work. I see the following error: java.io.IOException: Stopped at line 23, column 10: [XPST0003] Expecting ")", found "f". I highlighted line 23 for convenience. Please help me fix this. Thanks, Sony

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Search path for "import module"
by Ralf Jung 22 Sep '11

22 Sep '11

Hi list, since my XQuery's share some common utility functions, I created a "global.xq" file to contain those functions, and the actual scripts import that file using import module namespace red-db="red-db" at "global.xq"; However, BaseX then looks for that file in the working directory where it was started. Is there any way to configure that behaviour, e.g. to look into the HTTPPATH folder the script is located in, or maybe to make the lookup relative to the script that contains this command? Currently I always have to cd to the HTTPPATH folder before starting BaseX. I am using the current git master version. Kind regards, Ralf

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Building BaseX
by Ralf Jung 22 Sep '11

22 Sep '11

Hi list, I am trying to build and run the current git master version of BaseX. Unfortunately I could not find proper documentation on that process, just a bunch of docs saying how to use git etc. I should add that I did not use maven before. So I just went ahead, cloned both the basex and the basex-api repos, and called "mvn compile" in both of them (after an sudo apt-get install maven2, I am using Debian testing). That was guesswork, after noticing that "maven build" does not work and asking google ;-) In the basex folder, this compiled a lot of stuff, but all I could find is a bunch of class files - I had expected to find the jar file with all the data I need somewhere. By pure accident I then found a remark in the "integration" wiki page saying mvn has a "package" target, which at least gave me the jar file I looked for (maybe that could be added to the readme file, and the development section could clarify that "integrate into IDE" also contains the "how to build basex on command-line" doc). Now I wonder, can I re-use the etc and lib folder from 6.7.1, or do I need different versions? In basex-api, all I got was an error that maven could not find the artefact "org.basex:basex:jar:6.8-SNAPSHOT" - whatever that exactly means, I assume I have to tell it somehow where it can find the basex core jar file? I am quite a loss here, maybe someone can shed some light on the build process. Kind regards, Ralf

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XSpec 0.3.0 - A unit test framework for XSLT & XQuery
by Florent Georges 21 Sep '11

21 Sep '11

Hi, I am proud to announce a new version of XSpec, the XSLT and XQuery unit testing framework. The main changes are: - improved XQuery support - delivered as an EXPath package - new tests (of XSpec itself) - numerous bug fixes - new XProc harnesses for several processors - improved shell scripts and Ant build file - oXygen framework for editing - RNC schema for Emacs nXML mode You can download it, as usual, from the project website at: http://code.google.com/p/xspec/downloads/ As BaseX supports the EXPath packaging system, you can just give it the XAR package contained in the release ZIP file. New XProc pipeline "test harnesses" have developed. They have been developed with XML Calabash, and allow you to run your tests on (in alphabetical order): - BaseX (using the standalone processor) - eXist (by sending the query through the REST interface) - MarkLogic (by using Calabash's extension steps) - Saxon, both XSLT and XQuery - Zorba As always, feedback welcome on this list. Enjoy! Thanks to the whole XSpec team! Regards, -- Florent Georges http://fgeorges.org/ http://h2oconsulting.be/

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POST with custom content type
by Ralf Jung 21 Sep '11

21 Sep '11

Hi list, the BaseX [1] REST interface requires me to send POST requests with a content- type of "application/query+xml". Is it possible to send such requests with Orbeon? As far as I know, the only way to send POST requests is to use an XForms submission, which seems to force the content-type to "application/xml" - at least, if I change the serialize attribute to the other content type, no serialization is performed at all. Kind regards, Ralf [1] http://basex.org/

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Re: [basex-talk] Xquery full text - thesaurus option
by Dimitar Popov 20 Sep '11

20 Sep '11

Am Dienstag, 20. September 2011, 14:37:40 schrieb Andy Bunce: > Thanks, that is what I wanted to know. > Would be good to have this info on the wiki ;-) You're completely right! :) We try to keep the wiki helpful and complete, but sometimes we miss things :) Users and other devs are welcomed to write in the wiki. Greetings, Dimitar

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