BaseX-Talk February 2011

basex-talk@mailman.uni-konstanz.de

26 participants
48 discussions

Re: [basex-talk] BaseX question
by Christian Grün 24 Feb '11

24 Feb '11

Hi Phil (cc'ed to the list), as far as I can judge, XQuery expressions are too heterogeneous to provide realistic cost estimations. While our query compiler has some notion of "costs", those values are all relative, and used to select the (presumably) cheapest query plan or index access. The same applies to the estimation of query results: the costs and size of single XQuery results can vary a lot, as a single result node can span several MB, while a single atomic item may just take a few bytes. Hope this helps (at least a little), Christian ___________________________ > Hi Christian - is there a way to perform a low-cost (very fast) estimation of the amount of time a particular query would take without actually executing the query? In a server environment this is extremely useful. I would like to be able to rapidly check that queries will not be issued which exceed a certain execution time (roughly or even very roughly - e.g. on the order of a second vs. on the order of 100 or 1000 seconds.) Since my queries are going to be dynamically generated based on user supplied parameters this is an issue. A related issue is estimating the number of nodes retrieved as a result of a given query (again without actually executing it.) The estimation would not have to be very exact.

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Installer removes path variable on vista
by Marcus Beranek 24 Feb '11

24 Feb '11

Hi there, I just installed baseX 6.5.1 on a windows vista machine. Well, after installation my %PATH%-variable just contained exactly one entry: "C:\Program Files\BaseX\bin". The rest of my original path variable was removed by the installer... :-( Best regards, Marcus Beranek

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Re: [basex-talk] Facing problem while deploying BaseX under JBoss - getting sources from github not using git
by Jan Vlčinský (CAD) 24 Feb '11

24 Feb '11

Hi For those, who do not dare to use git, there are other options how to get sources from github - use Downloads button and click Download.tar.gz or Download.zip at the Download source on the top I tested it now and it contains sources from the latest change this morning - if you use Mercurial - there exists some Mercurial plugin by giithub for it and is told to work very well - some read svn support is there too https://github.com/blog/626-announcing-svn-support, and for writting too https://github.com/blog/644-subversion-write-support Anyway, do not understand me wrong - using git or Mercurial will work much better thanks to their design as distributed version control Jan 2011/2/24 Christian Grün <christian.gruen(a)gmail.com> > Dear Ashish, > > note that the SVN version is not frequently updated anymore (but > you'll probably have noted that by yourself). You can either free to > check out the code via git, or have a look at the latest snapshot > versions, found at > > http://files.basex.org/releases/latest/ > > The file date will tell you when the files have been uploaded (note > that the timezone is GMT+1). > > Christian > > > > Hi Leo, > > > > Thanks for considering my request. I will do svn update for the latest > code so would be able to make new jar. Thanks for your help. > > > > Regards, > > Ashish Jain > > > > > > --- On Wed, 2/23/11, Leonard Wörteler <leonard.woerteler(a)uni-konstanz.de> > wrote: > > > >> From: Leonard Wörteler <leonard.woerteler(a)uni-konstanz.de> > >> Subject: Re: [basex-talk] Facing problem while deploying BaseX under > JBoss > >> To: "Ashish Jain" <j.ashish(a)yahoo.com> > >> Cc: basex-talk(a)mailman.uni-konstanz.de > >> Date: Wednesday, February 23, 2011, 5:44 PM > >> Hi Ashish, > >> > >> Am 23.02.2011 09:52, schrieb Ashish Jain: > >> > I am facing problem while deploying BaseX under JBoss > >> due to JBoss’s (Virtual File System) for the I/O > >> operations. So “ClassLoader.getResource” under JBoss > >> context returns JBoss resource and then getContent() returns > >> “JBoss Stream” but not the java.io.InputStream, this can > >> be fix by using getResourceAsStream which returns > >> InputStream > >> > >> thanks for reporting that bug, I pushed your fix to our > >> GitHub repo. Do > >> you want me to send you a prebuilt basex.jar file including > >> the fix? > >> > >> Cheers Leo > >> > > > > > > > > _______________________________________________ > > BaseX-Talk mailing list > > BaseX-Talk(a)mailman.uni-konstanz.de > > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > -- *Ing. Jan Vlčinský* CAD programy Slunečnicová 338/3, 734 01 Karviná Ráj, Czech Republic tel: +420-597 602 024; mob: +420-608 979 040 skype: janvlcinsky; GoogleTalk: jan.vlcinsky(a)gmail.com http://cz.linkedin.com/in/vlcinsky

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Facing problem while deploying BaseX under JBoss
by Ashish Jain 24 Feb '11

24 Feb '11

Hello, I am facing problem while deploying BaseX under JBoss due to JBoss’s (Virtual File System) for the I/O operations. So “ClassLoader.getResource” under JBoss context returns JBoss resource and then getContent() returns “JBoss Stream” but not the java.io.InputStream, this can be fix by using getResourceAsStream which returns InputStream Changes required in org.basex.core.Lang.java at Line No: 66 ----------------------------------------------------------- final BufferedReader br = new BufferedReader(new InputStreamReader( (InputStream) url.getContent(), Token.UTF8)); ----------------------------------------------------------- Above line needs to be replaced with below: --------------------------------------------------------------- InputStream stream = Lang.class.getResourceAsStream(path); final BufferedReader br = new BufferedReader(new InputStreamReader( stream, Token.UTF8)); --------------------------------------------------------------- Regards, Ashish Jain

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BaseX wiki upgraded for me to first class resource (just beside Wikipedia)
by Jan Vlčinský (CAD) 23 Feb '11

23 Feb '11

Hi I noticed, many answers in this forum got shortened a lot in last weeks into simple short url pointing into wiki. For couple of years I use simple trick to search quickly terms in Wikipedia - it works for me on Firefox as well as nowadays on Google Chrome (other browsers will probably work that way too). - using keyword en, pressing Tab, entering searched term on English Wikipedia and pressing enter I get the page I need - the same with cs for Czech Wikipedia - *Today I added bx for BaseX Wiki as I found myself searching this site so often* Chrome allows to control this by wrench tool - first tab (Basic) - section Search - button Manage en - http://en.wikipedia.org/w/index.php?title=Special:Search&search=%s bx - http://docs.basex.org/index.php?title=Special:Search&search=%s&go=Go Now I have (almost) all the knowledge of BaseX team at my fingertips - thanks for it DBIS team. And thanks to those, who are willing to share their knowledge on this wiki. Jan

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Adding new doc into existing collection by means of XQuery
by Jan Vlčinský (CAD) 23 Feb '11

23 Feb '11

Hi Is there any method, how to add new doc into existing collection? I studied XQUF and it seems, like it can only update existing nodes. Options I was thinking about are - fn:put() - it is supposed for publishing into external documents, but if I could use uri of collection in BaseX and BaseX would accept it... - using database functions<http://docs.basex.org/wiki/Database_Functions>, but also here I do not see anything, what would add a doc The motivation is simple - if I could add docs by XQuery, I can save some roundtrips of data to insert Workaround is also not so difficult - simply using some sort of container doc in target collection and then modifying its nodes (putting here content of complete logical doc) instead of adding complete doc. Any comments are welcome. Jan

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Decimal-Format Declaration
by Artur Moor 23 Feb '11

23 Feb '11

Hi all, Does anybody know, if it possible to declare the decimal-format as it defined in in XQuery 3.0: declare default decimal-format decimal-separator = ',' Thanks, Artur

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Transforming a node without changing the database
by Sony Vijay 23 Feb '11

23 Feb '11

Hi, I am using BaseX 6.5. I am trying to transform a given node using an XQuery. Say, I have an node like so: <entry xmlns="http://www.w3.org/2005/Atom" xmlns:libx=" http://libx.org/xml/libx2"> <id>1</id> <title>Link Amazon By ISBN</title> <updated>2010-09-29T18:37:48.592Z</updated> <author> <name>LibX Team</name> <uri>http://libx.org</uri> <email>libx.org(a)gmail.com</email> </author> <content type="html">Content created by LibX Libapp Builder</content> </entry> I am trying to send this node to an xquery which is expected to do the following actions: - create a copy of this node (so that the actual node in the database does not change), - transform/modify the duplicate copy of the given node - return the modified duplicate copy of the given node I would expect the output to be like so: <entry xmlns="http://www.w3.org/2005/Atom" xmlns:libx=" http://libx.org/xml/libx2"> <id>1</id> <title>Link Amazon By ISBN</title> <updated>2010-09-29T18:37:48.592Z</updated> <author> <name>*Sony*</name> <uri>http://libx.org</uri> <email>libx.org(a)gmail.com</email> </author> <content type="html">*Copy of*: Content created by LibX Libapp Builder</content> </entry> I tried to perform the non-updating functions using transform and also tried to use a pending update list (Reference: http://docs.basex.org/wiki/Update#transform). None of this works as expected. Could you refer me to a more detailed documentation for performing such transform operations on nodes ? Thanks, Sony

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Possibly a bug in format-number function
by Artur Moor 22 Feb '11

22 Feb '11

Hi all, I think there is a bug in format-number function. Example: let $numbers := (1234.567, 789, 1234567.765) for $i in $numbers return format-number($i, "#,###.##") BaseX output: 1,234.57 789 1234,567.76 Should output: 1,234.57 789 1,234,567.76 Regards, Artur

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RFS: basex - XML database and XPath/XQuery processor
by Alexander Holupirek 21 Feb '11

21 Feb '11

Hi all, I am looking for a sponsor for the package "basex". BaseX is a native XML database and XPath/XQuery processor written entirely in Java. Besides it supports the latest W3C Full Text and Update Recommendations. BaseX can be operated from command line, in client/server mode, or using a GUI. Package name : basex Version : 6.5.1-1ubuntu1~ppa3 Upstream Author : Christian Gruen et al. URL : http://www.basex.org License : BSD Section : database The package appears to be lintian clean. My motivation for maintaining this package is: * apt-cache search xquery should provide more results than just galax, saxon, and xqilla. http://en.wikipedia.org/wiki/XML_database gives an overview and this package fills a gap. * BaseX is especially useful when learning XPath/XQuery. BaseX offers a very nice and interactive XQuery Editor and XML visualizations Screenshots: http://basex.org/products/gui/ * I'm part of the developer team and I'm sure I can convince the guys to make BaseX as Debian compliant as possible. The package can be found on mentors.debian.net: * URL: http://mentors.debian.net/debian/pool/main/b/basex * Source repository: deb-src http://mentors.debian.net/debian unstable main contrib non-free * dget http://mentors.debian.net/debian/pool/main/b/basex/basex_6.5.1-1ubuntu1~ppa… Description: XML database and XPath/XQuery processor BaseX is a very fast and light-weight, yet powerful XML database and XPath/XQuery processor, including support for the latest W3C Full Text and Update Recommendations. It supports large XML instances and offers a highly interactive front-end (basexgui). Apart from two local standalone modes, BaseX offers a client/server architecture. . The package provides following commands: * basexgui ....... Standalone local XML database. Graphical User Interface (GUI) mode. Includes data visualizations and XQuery editor. * basex .......... Standalone local XML database. Command line mode. * basexserver .... XML database server * basexclient .... XML database client Homepage: http://basex.org I would be glad if someone uploaded this package for me. Kind regards Alex

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BaseX-Talk February 2011