BaseX-Talk December 2014

basex-talk@mailman.uni-konstanz.de

28 participants
50 discussions

Bug in computed attribute constructor
by Hans-Juergen Rennau 08 Dec '14

08 Dec '14

Dear BaseX team, I think there is a bug in the computed attribute constructor. If the name expression evaluates to a value of type xs:string or xs:untypedAtomic and the value contains no prefix, the attribute name should be in no namespace. However, the following code: <node xmlns="http://www.infospace.org/pcollection">{ attribute a1 {'foo1'}, attribute {'a2'} {'foo2'} }</node> yields this result:<node xmlns:ns0="http://www.infospace.org/pcollection" xmlns="http://www.infospace.org/pcollection" a1="foo1" ns0:a2="foo2"/> While @a1 has the expected name, @a2 hasn't. I used the latest snapshot: BaseX 8.0 beta 95b7e5f [Standalone] Kind regards,Hans-Juergen http://www.w3.org/TR/xquery-30/#id-computedAttributes

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requests concerning the map-module
by Rob Stapper 08 Dec '14

08 Dec '14

Hi Christian, When processing XML-sources one is most probably going to need internal lookup-tables. The map-module in combination with closures;-) for its mapped data makes a great solution for this. However, the map-key just being just a single atomic value restricts its use or at least leads to some creativeness: - Sometimes one just needs a combined key instead of a single value key. My solution now is to convert the key-values to strings and concatenate them but this is no full-proof method. - Or, when processing XML-data, one wants the key to be an XML-element. For this I use a json-conversion, which works, but I still have to program the conversion. Both situations occur within my project. So, my request is to extend the map-key to allow multiple key-values and XML-elements. Well, now we're on it; why not allow closures as key-values. In that case we've our solution for the previous multiple key value request. How do you feel about this? Oh, now we're on the map-module; an update-function would be great. While processing XML-data one needs to update its lookup-tables often. I use the code below in a module. Maybe it's a candidate for an embedded map-module function. declare function XQR.map:update ( $map as map(*) , $key as xs:anyAtomicType , $init.data as item() , $updateFunction as function(*) ) { map:put( $map , $key , $updateFunction( let $go := function( $entry.data ) { if ( exists( $entry.data)) then $entry.data else $init.data } return $go( map:get( $map, $key)) ) ) } ; Kind regards, Rob Stapper --- Dit e-mailbericht is gecontroleerd op virussen met Avast antivirussoftware. http://www.avast.com

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Error
by Rob Stapper 04 Dec '14

04 Dec '14

Hi Christian, I'm getting the error-message[ 1] shown below. I'm using the GUI of the latest BaseX-snapshot: basex 8.0 beta aaca13a . I'm not able (yet) to provide you with a small running snippet where this error occurs but I can provide the piece of code where it starts going wrong: This piece of code triggers the error: ======================================= declare function local:sequenceElement.processor ( $sequenceElement as element( ) , $initialMap as map(*) ) { fold-left( $sequenceElement/child::* , $initialMap , local:element.processor#2 ) } ; ======================================= If I change it into this piece of code all works fine: ======================================= declare function local:sequenceElement.processor ( $sequenceElement as element( ) , $initialMap as map(*) ) { fold-left( $sequenceElement/child::* , $initialMap , function( $currentMap , $element ) { local:element.processor( $currentMap, $element) } ) } ; ======================================= I have a feeling that this is a re-introduced bug, solved a while ago by Leo Woerteler. I hope this is enough information to solve the issue. Please let me know if you need more information. TIA, Rob Stapper [ 1] Error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.0 beta aaca13a Java: Oracle Corporation, 1.7.0_71 OS: Windows Vista, x86 Stack Trace: java.lang.ClassCastException: org.basex.query.value.type.AtomType cannot be cast to org.basex.query.value.type.FuncType at org.basex.query.func.Closure.item(Closure.java:272) at org.basex.query.func.Closure.value(Closure.java:314) at org.basex.query.QueryContext.value(QueryContext.java:402) at org.basex.query.expr.gflwor.Let$LetEval.next(Let.java:187) at org.basex.query.expr.gflwor.GFLWOR$2.next(GFLWOR.java:74) at org.basex.query.iter.Iter.value(Iter.java:54) at org.basex.query.expr.ParseExpr.value(ParseExpr.java:67) at org.basex.query.QueryContext.value(QueryContext.java:402) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:199) at org.basex.query.func.FuncCall.invoke(FuncCall.java:87) at org.basex.query.func.FuncCall.value(FuncCall.java:61) at org.basex.query.QueryContext.value(QueryContext.java:402) at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:127) at org.basex.query.func.FuncCall.invoke(FuncCall.java:87) at org.basex.query.func.FuncCall.value(FuncCall.java:159) at org.basex.query.value.item.FItem.invokeValue(FItem.java:43) at org.basex.query.func.fn.FnFoldLeft.iter(FnFoldLeft.java:28) at org.basex.query.expr.TypeCheck.iter(TypeCheck.java:85) at org.basex.query.expr.ParseExpr.item(ParseExpr.java:49) at org.basex.query.expr.ParseExpr.toItem(ParseExpr.java:467) at org.basex.query.expr.ParseExpr.toMap(ParseExpr.java:619) at org.basex.query.func.map.MapForEach.iter(MapForEach.java:17) at org.basex.query.expr.gflwor.GFLWOR$2.next(GFLWOR.java:78) at org.basex.query.MainModule$1.next(MainModule.java:117) at org.basex.query.QueryContext.execute(QueryContext.java:614) at org.basex.query.QueryProcessor.execute(QueryProcessor.java:100) at org.basex.core.cmd.AQuery.query(AQuery.java:82) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:360) at org.basex.core.Command.execute(Command.java:94) at org.basex.gui.GUI.exec(GUI.java:470) at org.basex.gui.GUI.access$5(GUI.java:427) at org.basex.gui.GUI$8.run(GUI.java:414) --- Dit e-mailbericht is gecontroleerd op virussen met Avast antivirussoftware. http://www.avast.com

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Reg : NegativeArraySizeException
by Chandrasekhar 04 Dec '14

04 Dec '14

Dear Team we are getting the below issue while opening database and replacing the file to the database.Please guide us to resolve the issue. We are using below code to replace the file. Context context = new Context(); LocalSession ls = new LocalSession(context); ls.execute("OPEN DBNAME"); ls.replace("FILENAME",new FileInputStream("FILEPATH")); org.basex.core.BaseXException: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 7.9 Java: Sun Microsystems Inc., 1.6.0_30 OS: Linux, amd64 Stack Trace: java.lang.NegativeArraySizeException at org.basex.io.random.DataAccess.readBytes(DataAccess.java:216) at org.basex.io.random.DataAccess.readToken(DataAccess.java:194) at org.basex.io.random.DataAccess.readToken(DataAccess.java:185) at org.basex.data.DiskData.txt(DiskData.java:267) at org.basex.data.DiskData.text(DiskData.java:235) at org.basex.index.resource.Docs.paths(Docs.java:106) at org.basex.index.resource.Docs.docs(Docs.java:229) at org.basex.index.resource.Resources.docs(Resources.java:120) at org.basex.core.cmd.Replace.run(Replace.java:51) at org.basex.core.Command.run(Command.java:329) at org.basex.core.Command.execute(Command.java:94) at org.basex.core.Command.execute(Command.java:117) at org.basex.server.LocalSession.execute(LocalSession.java:96) at org.basex.server.LocalSession.replace(LocalSession.java:80) at com.in10s.collectioncreation.CRSXMLDBManager.createCollection(CRSXMLDBManager.java:183) at com.in10s.collectioncreation.CRSCollectionCreator.main(CRSCollectionCreator.java:138) at com.in10s.filewatcher.CRSFileWatcher.main(CRSFileWatcher.java:52) Thanks&Regards ChandraSekhar The information contained in this e-mail and any accompanying documents may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient of this message, or if this message has been addressed to you in error, please immediately alert the sender by reply e-mail and then delete this message, including any attachments. Any dissemination, distribution or other use of the contents of this message by anyone other than the intended recipient is strictly prohibited.

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basex 8 beta json serialization
by Andy Bunce 03 Dec '14

03 Dec '14

Hi, I cant get this to work. My test is https://gist.github.com/apb2006/2f1a6ec32de4b0aefcdd /json2 returns the text I expect. /json returns zero content. Is there some new config I am missing? /Andy

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running BaseX 8.0 under OSX 10.6.8?
by C. M. Sperberg-McQueen 02 Dec '14

02 Dec '14

When I attempt to run the copy of BaseX 8.0 I just downloaded under OS X 10.6.8, I get the following error report, which at the moment I am having some trouble deciphering. cmsmcq$ /opt/local/BaseX-8.0/basex/bin/basexgui Exception in thread "main" java.lang.UnsupportedClassVersionError: org/basex/BaseXGUI : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) cmsmcq$ Is this telling me that BaseX requires a more recent version of Java than I currently have on this machine? Or is it something else? [Yes, I know, I should upgrade my operating system and possibly my hardware ... someday.] Thanks for any help. -- **************************************************************** * C. M. Sperberg-McQueen, Black Mesa Technologies LLC * http://www.blackmesatech.com * http://cmsmcq.com/mib * http://balisage.net ****************************************************************

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New blog post: Origami - XQuery screen scraping with Extractors
by Marc van Grootel 01 Dec '14

01 Dec '14

It was already up for a while but DNS issues made my blog go missing for almost a week. Now it's back. http://xokomola.com/2014/11/18/xquery-origami-2.html The post describes how to do screen scraping using Origami extractors. I'm quite happy with the outcome. --Marc

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Fold - HTTP routing library
by Marc van Grootel 01 Dec '14

01 Dec '14

Hi, I would like to announce a new library (very alpha) called Fold. https://github.com/xokomola/fold It is a an HTTP routing library which provides an alternative way to map HTTP requests to XQuery functions. In future I hope to use this together with Origami to build REST services and small web apps. My main goal of announcing this is to get feedback on how to improve this. Currently it is defined on top of RESTXQ but in future this might be handled by a Java extension. There are parts missing still and I strongly advise you not to use this for a serious project. Performance gets bad quite quickly. Performance gains may very well be possible by XQuery refactorings. I basically wrote this as a port from a couple of Clojure libraries. A bit of documentation for this library and for Origami can be found in each project's wiki. Note that I only just started these and they are not complete. I'll be working on this library over the next month to get it into a more usable shape. Happy to receive comments and improvements. --Marc

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java.lang.RuntimeException: Insertion at beginning of populated table.
by Andy Bunce 01 Dec '14

01 Dec '14

Hi, With the latest snapshot. running the attached code twice generates the error below. The intent to create or update a database from the data files. Regards /Andy Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.0 beta 07cd3e9 Java: Oracle Corporation, 1.7.0_60 OS: Windows 8.1, amd64 Stack Trace: java.lang.RuntimeException: Insertion at beginning of populated table. at org.basex.util.Util.notExpected(Util.java:60) at org.basex.io.random.TableDiskAccess.insert(TableDiskAccess.java:325) at org.basex.data.Data.insert(Data.java:915) at org.basex.data.Data.insert(Data.java:806) at org.basex.data.atomic.Replace.apply(Replace.java:64) at org.basex.data.atomic.AtomicUpdateCache.applyUpdates(AtomicUpdateCache.java:298) at org.basex.data.atomic.AtomicUpdateCache.execute(AtomicUpdateCache.java:282) at org.basex.query.up.DataUpdates.apply(DataUpdates.java:164) at org.basex.query.up.ContextModifier.apply(ContextModifier.java:110) at org.basex.query.up.Updates.apply(Updates.java:133) at org.basex.query.QueryContext.iter(QueryContext.java:348) at org.basex.query.QueryContext.execute(QueryContext.java:590) at org.basex.query.QueryProcessor.execute(QueryProcessor.java:100) at org.basex.core.cmd.AQuery.query(AQuery.java:82) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:360) at org.basex.core.Command.execute(Command.java:94) at org.basex.gui.GUI.exec(GUI.java:470) at org.basex.gui.GUI.access$5(GUI.java:427) at org.basex.gui.GUI$8.run(GUI.java:414)

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More Diacritic Questions
by Chris Yocum 30 Nov '14

30 Nov '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi Everyone, I am rather confused again about diacritic handling in basex. For instance, with Full Text turned on a word like athgabáil will match both athgabail and athgabáil with "diacritics insensitive" which is what I would expect. However, if I try to match a word like cúachṡnaidm (with s with a dot above), it will not match without "diacritics sensitive" turned on in the query itself. I am rather confused why it would match in the case of athgabáil but not in the case of cúachṡnaidm. Does anyone know why this is happening and how to make it match like the other match? All the best, Chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iF4EAREIAAYFAlRyFScACgkQDjE+CSbP7HogoQD/eyQT0ioILJv3KHL1cKyNi+Ht a8s0g3Az5o6Uvnniw50A/Reyycsn8YiIY3naEOPuwKydBOUwrYKSe5fjOTqtZyXl =jycQ -----END PGP SIGNATURE-----

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BaseX-Talk December 2014