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

Stored procedures (XRPC) support
by Harmen Wessels 24 Feb '10

24 Feb '10

I am currently working on a research project on native XML databases and I am trying some stuff on BaseX and I must complement on the nice GUI supplied with the database. After testing some stuff I now have a question: is there support for stored procedures in some sort for BaseX? I would like to query the database using a XQuery which is stores in the database and can be called using some parameters. Thanks. Regards, Harmen Wessels.

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GUI client error when adding doc without chopping whitespace
by Tobin Edwards 23 Feb '10

23 Feb '10

I'm seeing a null pointer exception in the GUI client when adding an XML file to an empty database that uses an internal parser and does NOT chop whitespace. Using the command-line tool to add the same file works fine. Note, I'm running the database in a server (as opposed to standalone). Is this a known issue? Any help would be appreciated. Here's the error I get when I add the file using the GUI client: Error: Possible bug? Feedback is welcome: info(a)basex.org BaseX 6.0: java.lang.NullPointerException org.basex.index.Names.index(Names.java:81) org.basex.build.Builder.addText(Builder.java:384) org.basex.build.Builder.text(Builder.java:192) org.basex.build.xml.XMLParser.parse(XMLParser.java:46) org.basex.build.xml.DirParser.parse(DirParser.java:68) org.basex.build.xml.DirParser.parse(DirParser.java:48) org.basex.build.Builder.parse(Builder.java:87) org.basex.build.MemBuilder.build(MemBuilder.java:36) org.basex.core.proc.Add.exec(Add.java:42) org.basex.core.Proc.exec(Proc.java:108) org.basex.gui.GUI.exec(GUI.java:428) org.basex.gui.GUI.execute(GUI.java:336) org.basex.gui.GUI$3.actionPerformed(GUI.java:236) javax.swing.AbstractButton.fireActionPerformed(Unknown Source) javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) javax.swing.DefaultButtonModel.setPressed(Unknown Source) javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) java.awt.AWTEventMulticaster.mouseReleased(Unknown Source) java.awt.Component.processMouseEvent(Unknown Source) javax.swing.JComponent.processMouseEvent(Unknown Source) java.awt.Component.processEvent(Unknown Source) java.awt.Container.processEvent(Unknown Source) java.awt.Component.dispatchEventImpl(Unknown Source) java.awt.Container.dispatchEventImpl(Unknown Source) java.awt.Component.dispatchEvent(Unknown Source) java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) java.awt.Container.dispatchEventImpl(Unknown Source) java.awt.Window.dispatchEventImpl(Unknown Source) java.awt.Component.dispatchEvent(Unknown Source) java.awt.EventQueue.dispatchEvent(Unknown Source) java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) java.awt.EventDispatchThread.pumpEvents(Unknown Source) java.awt.EventDispatchThread.pumpEvents(Unknown Source) java.awt.EventDispatchThread.run(Unknown Source) Thanks, Tobin

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euroDownload.com: Golden award for BaseX
by supp＠eurodownload.com 23 Feb '10

23 Feb '10

Reply-To: supp(a)eurodownload.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Message-Id: <20100223100804.2F8CB1033FFE(a)xeon.euronetix.com> Date: Tue, 23 Feb 2010 04:08:04 -0600 (CST) Hello, Your product "BaseX" has been tested by the euroDownload.com labs and we have granted it by our best - GOLDEN award ! To let your users know about this Golden award, you may display this award on your website. You can do it easy by adding of the following HTML code to your web: <a href="http://www.eurodownload.com/download-software/155774/BaseX.html" target="_blank"><img src="http://www.eurodownload.com/images/rating5.png" alt="BaseX - Golden award" border="0"></a> Best Regards, euroDownload.com team http://www.eurodownload.com supp(a)eurodownload.com ---------------------------------------------------------------------- About us: EuroDownload.com is one of the oldest download sites (found in 2002). In our archive has been listed more than 78000 software titles. ----------------------------------------------------------------------

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DRIVER
by ispanico87_nf＠libero.it 22 Feb '10

22 Feb '10

Hi, static final String DRIVER ="org.basex.api.xqj.BXQDataSource"; Why use the class org.basex.api.xqj.BXQDataSource??? In JDBC driver is associated with a database. Why in XQJ I use a class??? Sorry for my English...i'm Italian.

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Preserving CDATA sections
by Nageswararao Yenuganti 17 Feb '10

17 Feb '10

2 1

Full-text speed
by Thomas Goossens 16 Feb '10

16 Feb '10

Hello, I am trying XQuery Full-text on BaseX and I am a bit surprised by the full-text query speed: I have loaded the Shakespeare plays into a BaseX database, and created a full-text index. So far so good. Then I a tried a query like: //LINE[ . contains text "romeo juliet" all words] (4 hits) It takes about 1200 ms. I expected less than 100 ms. For example I tried Qizx and it takes less than 20 ms. Even eXist (old version, with a different syntax) was taking around 200 ms. I tried dropping the full-text index: that makes no difference! So clearly the FT index is not used. What should I do ? Thanks

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How to Connect to BaseX in Java
by paulomgj＠gmail.com 14 Feb '10

14 Feb '10

Hi, I would like to know how to connect to BaseX using XQJ. I'm searching for the connection string (where i can put the login, password, port, etc.) to create a XQDataSource but I'm not finding it. Thansk in advance

2 1

Querying the Wikipedia XML dump
by Jason Priem 13 Feb '10

13 Feb '10

Hi, I set up a database in BaseX with the Wikipedia articles dump (all 25 GB of it). I'm able to access individual articles though the treemap display (by clicking on them), but I get null responses for every xpath query run, even really basic stuff like "//title." I'm sorry if this is a very obvious question; I'm a beginner to XML databases. Any ideas as the problem, or what to do to find out more? Thanks! j -- Jason Priem UNC Royster Fellow School of Library and Information Science University of Carolina at Chapel Hill

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XQJQuery Example
by sohguanh＠yahoo.com.sg 12 Feb '10

12 Feb '10

Hi, I just downloaded BaseX and intend to try running the example code. For XQJQuery.java I am having problem. I get below error. UnsupportedClassVersionError: Bad version number in .class file. I am trying to use the BaseX implementation of XQJ API only. I intend to explore the BaseX XML database related features later on.

2 1

Videos of BaseX in action
by Dave Ashton 11 Feb '10

11 Feb '10

Our project is developing Open Source procedures and tool/s to automate the gathering of metadata from evidence artefacts collected during digital forensic examinations and visualise the relationships between actors => objects using existing Knowledge Discovery and Social Network Analysis technique. We are currently using BaseX to store the gathered information and have been very impressed by its performance so far. So much so we have posted two videos of it in action on YouTube. You can access them from oursite<http://www.osvisnet.co.cc/index.php?option=com_content&view=category&layout…>at or directly at YouTube by searching for OsVisNet. Thanks for all your hard work for making this possible. Regards Dave Project Founder

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Well done!
by ep＠ardec.com 11 Feb '10

11 Feb '10

Congrats for your efforts and well done product. I've worked with Berkeley dbxml, eXist, and Mark Logic. So I really appreciate the clean api, speed!, and compactness. Keep up the great work! Do you have roadmap somewhere? I'd like to get an idea where you are headed with development and if you could use any assistance. Best, Erik Peterson

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Re: [basex-talk] Full-text speed
by Thomas Goossens 10 Feb '10

10 Feb '10

[sorry for the previous message, my mistake] Hello Christian, thanks for your very fast reply (in middle of the night...) Indeed the query you gave me runs much faster. But... 1) that's not my query: I was using 'all words', and my query still runs without index. 2) I think that 'text() 'is not equivalent to '.'. For example I could not use text() here //SPEECH[ . contains text "romeo juliet" all words] By the way, this query just doesn't work (while it should return 42 hits). Never mind, I am sure you will fix that soon. Cheers. On Thu, Feb 11, 2010 at 12:42 AM, Christian Grün <christian.gruen(a)gmail.com>wrote: > Hi Thomas, > > your query will be evaluated much faster if you rewrite it to.. > > //LINE[ text() contains text "romeo juliet"] > > This query should take ~3-5 ms on the 7.5mb Shakespeare instance. > > You can have a look into our XQuery documentation > (http://basex.org/xquery, Section »Query Evaluation«) to get more > insight on query compilation and how to utilize the index structures. > > Hope this helps, > Christian >

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Database creation error on Windows Vista SP 2 64-bit
by dnm＠pobox.com 04 Feb '10

04 Feb '10

Hi there, I recently downloaded and tried to use BaseX 6 on Windows Vista SP 2 64-bit. I'm consistently experiencing an error message whenever I try to create a database (which seems to be necessary even when trying to open a database). I'm using BaseX in GUI mode. I've seen this behavior with both the BaseX6.exe version (initially) and the .jar as packaged in the BaseX6.zip archive (as a second test). I've included a link to a PNG file below which will hopefully show up. http://dl.dropbox.com/u/395437/basex6-db-creation-error.png Thanks in advance for any help!

3 3

BaseX server without X Window System on Linux
by Steven Anderson 03 Feb '10

03 Feb '10

My Linux server doesn't have X. When I try to run the BaseX server, with the command: java -Xmx1024m -jar BaseX.jar org.basex.BaseXServer I get the following error: No X11 DISPLAY variable was set, but this program performed an operation which requires it. Can I run the server without X? Steve

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bug in namespace resolution after inserts
by Rares Vernica 03 Feb '10

03 Feb '10

Hello, I think there might be a bug in namespace resolution after an insert. I have two xml files: doc.xml <?xml version="1.0" encoding="UTF-8"?> <doc xmlns:a="http://a"> <a:x>1</a:x> </doc> doc2.xml <?xml version="1.0" encoding="UTF-8"?> <r xmlns="http://b" xmlns:a="http://a"> <a:x>2</a:x> </r> I create database "doc" from "doc.xml". Then, I preform the following insert query: declare namespace a = "http://a"; declare namespace b = "http://b"; insert nodes doc("doc2.xml")/b:r/a:x into basex:db("doc")/doc and the result is: <doc xmlns:a="http://a"> <a:x>1</a:x> <a:x xmlns="http://b">2</a:x> </doc> but basex:db("doc")/doc/a:x returns <a:x xmlns:a="http://a">1</a:x> Cheers, Rares

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BaseX 6 GUI does not start properly
by Rares Vernica 02 Feb '10

02 Feb '10

Hello, I used BaseX GUI before version 6 successfully. Version 6 GUI does not start properly and throws a lot of exceptions. Here is the first one: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at sun.java2d.SunGraphics2D.addRenderingHints(SunGraphics2D.java:1295) at org.basex.gui.layout.BaseXBack.paintComponent(BaseXBack.java:62) at org.basex.gui.view.ViewContainer.paintComponent(ViewContainer.java:114) at javax.swing.JComponent.paint(JComponent.java:1029) at org.basex.gui.view.ViewContainer.paint(ViewContainer.java:269) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5124) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:278) at javax.swing.RepaintManager.paint(RepaintManager.java:1220) at javax.swing.JComponent._paintImmediately(JComponent.java:5072) at javax.swing.JComponent.paintImmediately(JComponent.java:4882) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714) at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694) at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) The main window loads but it is empty. If I hover over the window with my mouse, the buttons start appearing. Anyway, it is unusable. I do not have this issue with 5.7. Here is the Java version that I use: > java -version java version "1.6.0_16" Java(TM) SE Runtime Environment (build 1.6.0_16-b01) Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing) The computer is a 32bit PC with the latest Ubuntu OS. Thank you for BaseX. Keep up the good work! Cheers, Rares Vernica

2 5

FileTransit - Product Submission Approved
by FileTransit 01 Feb '10

01 Feb '10

Dear Developer, Your product, BaseX, has been published today on our site. Category: Windows Software / Programming / Database Tools Name: BaseX URL: http://www.filetransit.com/view.php?id=35541 Best Regards, FileTransit Team. http://www.filetransit.com/ Â© 1998-2010 FileTransit.com

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xpath expressions vs xquery select
by Travis Webb 31 Jan '10

31 Jan '10

I'm trying to figure out which is more efficient (xpath or xquery select), so if someone has knowledge on this I'd appreciate any input. This may or may not be specific to the implementation of BaseX. For example, the following queries return the same thing, but which one is faster? Does basex treat them the same way? 1 uses xquery select, 2 uses xpath 1. for $x in doc('test')/* where $x/node="value" return $x OR 2. for $x in doc('test')/*[node="value"] return $x Thanks. -tjw

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Certificate for BaseX - Works with Vista
by FreeVistaFiles.com 29 Jan '10

29 Jan '10

January 29, 2010 ************************** Hello DBIS Group, University of Konstanz, We are glad to let you know that your software "BaseX" have received a "Works with Vista" certificate. You must know, no more than 20% of all software titles from our site will receive this award. ----------------------------------------------------------------------------------------------------- You should use this certificate by displaying it on your website or inside your product: CERTIFY IMAGE URL: http://www.freevistafiles.com/images/vista_certificate.png URL: http://www.freevistafiles.com/ TITLE: Windows Vista Downloads Best Regards, Free Vista Files team http://www.freevistafiles.com/

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Re: [basex-talk] BaseX questions
by Christian Grün 28 Jan '10

28 Jan '10

Dear Swaminathan, On Thu, Jan 28, 2010 at 8:48 AM, Swaminathan S <swami2(a)gmail.com> wrote: > Hi Christian, > > I am will be using BaseX for multiple xml files that are about 1GB size > (few million lines of in the file). I will be doing transactions on these > BaseX databases in any sequence (For example: an update on databaseA, an > update on databaseB, few Queries on databaseC, few updates on databaseB > ...). > > Could you please give your reply on the following questions: > > My questions: > > Question 1) Does creating a Collection object (see example below) a > costly operation in terms of memory utilization? Also, let > Collection collection = > database_.getCollection("basex://localhost:1984/databaseName", null, null) I guess you are using the XML:DB API? Creating a collection should be very cheap (i.e., not take longer than some milliseconds). > Question 2) Suppose I do the following steps in the order given below: > > a) create a Collection on the database > b) create a XPathQueryService object as below: > service = (XPathQueryService) collection.getService( "XPathQueryService", > "1.0" ); > c) Run Xquery Updates on the database using "Xquery" object of BaseX. > d) query the collection created in step a) as follows: > ResourceSet resourceSet = service.query("< my query>") > > Will my "query" in step d) be able to see the "updates" made in step c) ? > Could you please let me know briefly if there are some concept of > "Collection" I need to know. All database updates will be reflected by subsequent queries. I'm not 100% sure, however, what you refer to with the "Xquery" object? The usual approach to perform queries with the XML:DB API is to call the query() method: XPathQueryService.query(query); ..see also http://basex.org/code.php?code=XMLDBQuery > Question 3) When I do an Xquery on an invalid xpath (or do > xPathQueryService.query() on an invalid xpath), BaseX is not throwing an > exception. Our application would need this functionality. Could you please > give your comments on this? Well, it depends on what you call "invalid". As long as an XPath query is correct, according to the language specification, no errors will be thrown. If you use tag names in your location path that do not occur in the original XML document, the query processor cannot guess that this was done by mistake. > Question 4) I have two choices to run queries on BaseX database a) using > Xquery object b) using XPathQueryService on a Collection. Could you please > let me know which is better and in which scenarios? So you talk about using our own API vs. the XML:DB API? In general, I would recommend to stick to one single API and not mix them up. Next, we observe that most users end up using our own API and discard XQJ and XML:DB, as these APIs do not come up to all expectations – at least in their current stage. Hope this helps, Christian fyi: I've forwarded your e-mail to the basex-talk mailing list.

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Re: [basex-talk] BaseX db questions
by Christian Grün 28 Jan '10

28 Jan '10

Dear Aleks, > Adding a flag would be great , this will helps out so that we can sync database changes into xml file in one call. I've added the flag which allows updates files to be written back to disk. Note that, currently, all files of a modified database will be written back to disk after an update operation has been completed. Note that this is experimental; you're invited to test the latest version of the sources, which you find in our Subversion repository. The flag can be activated via the SET command in BaseX: Command Line: set writeback on; create db input.xml; xquery delete node //text() BaseX API: Context ctx = new Context(); new Set("WRITEBACK", true).execute(ctx); new CreateDB("input.xml").execute(ctx); new XQuery("xquery delete node //text()").execute(ctx); > We are getting the following exception while performing query against database : > Main.notexpected(Object...) line: 205 > TableDiskAccess.cursor(int) line: 326 > [...] > Can you shade some light why would this happen ? this problem happens randomly. This exception might (but need not) indicate an inconsistency in the data storage. It would be great if you could try to create a reproducible example – although I guess this might not be easy if the issue occurs only randomly. > We currently create a single Context object for every open database and keep passing this context for every call, do you think this will cause the problem ? That should be fine. Do you close the database/context – data.close() / context.close() – after all updates have been processed? All the best, Christian

1 0

Issue with Add using XML string
by J Gager 28 Jan '10

28 Jan '10

Sorry for the repeat posts on my last question. I was expecting a confirmation from the web page that the mail was sent - I should know better than to keep clicking :) As stated in my previous question (subject: Issues with XQuery insert), we have tried different methods to add new XML documents to a collection using the Java API. One such approach is to use the Add command, supplying the document content as the XML string. When doing so, the process will fail when there are double quotes used in the attribute values. For example, the following string; <s:test xmlns:s="abc" xmlns:x="def">hello</s:test> yields this error; (Line 1): Open quote is expected for attribute "{1}" associated with an element type "xmlns:s". Alternatively this string; <s:test xmlns:s='abc' xmlns:x='def'>hello</s:test> is not an issue. The double quotes are also not an issue when the argument to the Add command points to a file. Has anyone else encountered this issue? We could of course replace the double quotes with single quotes - however this is not desirable since some of the content of our XML file may contain double quotes that we would not want to change. Thanks, J Gager

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Issues with XQuery insert
by j.gager＠metadatatechnology.com 28 Jan '10

28 Jan '10

Hello We are using BaseX6 to manage a local repository of XML artifacts in a Java based application. We initially start with an empty collection, and add documents as they are needed. We have tried a number of approaches to this (more to come on this in a separate email). One such approach is to insert the documents as nodes into the container using XQuery. Example: insert nodes document {<t:test xmlns:t='xyz' xmlns:s='def'>good <s:test>bye</s:test></t:test>} into collection('MyCollection') It seems to me that only the first namespace declaration is retrained. If I follow this insertion with the following query: declare namespace x ="xyz"; declare namespace y ="def"; collection('MyCollection')/x:test I get the following result: <t:test xmlns:t="xyz">good <s:test xmlns:s="">bye</s:test></t:test> Notice that the namespace for the prefix s is now empty. Further, if I reverse the order of the namespace declarations in the insert query: <t:test xmlns:s='def' xmlns:t='xyz'>good <s:test>bye</s:test></t:test> The query used above will not return a result (presumably because the xyz namespace has been dropped). Has anyone else encountered such issues? Currently we are working around this by saving the XML content to a file and using the Add process - which seems to work as expected. If possible, we would prefer to avoid this extra step of saving the XML to a temporary file before adding it to our BaseX database. Thanks, J Gager

2 1

BaseX db questions
by aleks＠narus.com 27 Jan '10

27 Jan '10

Hello, I'm evaluating baseX database and trying to figure out few details: 1) What is the concept of the Context ? Do I need to create a new context for every database operation or same context should be used within open database ? 2) Is it true that I have to open and close database every time I run query or I can keep database open. 3) How does commit occur, with basex6 it seems like data being committed to disk with some delay? Thanks a lot in advance!! --Aleks

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Issues with XQuery insert
by J Gager 27 Jan '10

27 Jan '10

Hello We are using BaseX6 to manage a local repository of XML artifacts in a Java based application. We initially start with an empty collection, and add documents as they are needed. We have tried a number of approaches to this (more to come on this in a separate email). One such approach is to insert the documents as nodes into the container using XQuery. Example: insert nodes document {<t:test xmlns:t='xyz' xmlns:s='def'>good <s:test>bye</s:test></t:test>} into collection('MyCollection') It seems to me that only the first namespace declaration is retrained. If I follow this insertion with the following query: declare namespace x ="xyz"; declare namespace y ="def"; collection('MyCollection')/x:test I get the following result: <t:test xmlns:t="xyz">good <s:test xmlns:s="">bye</s:test></t:test> Notice that the namespace for the prefix s is now empty. Further, if I reverse the order of the namespace declarations in the insert query: <t:test xmlns:s='def' xmlns:t='xyz'>good <s:test>bye</s:test></t:test> The query used above will not return a result (presumably because the xyz namespace has been dropped). Has anyone else encountered such issues? Currently we are working around this by saving the XML content to a file and using the Add process - which seems to work as expected. If possible, we would prefer to avoid this extra step of saving the XML to a temporary file before adding it to our BaseX database. Thanks, J Gager

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