BaseX-Talk

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5252 discussions

deduplication problem in BaseX 7.9?
by C. M. Sperberg-McQueen 06 Oct '14

06 Oct '14

Consider the following XML document: <article> <front> <article-meta> <aff id="aff1">Tropical and Infectious Disease Hospital, Kathmandu, Nepal</aff> <aff id="aff2">Nagasaki University, Nagasaki, Japan</aff> <aff id="aff3">Department of Radiology, Kyorin University Faculty of Medicine, Tokyo, Japan</aff> <aff id="aff5">Pentax Company Limited, Tokyo, Japan</aff> <aff id="aff6">National Research Laboratory of Molecular Complex Control, Yonsei University, Seoul, Korea</aff>  <article-id pub-id-type="pmc">2570825</article-id> <article-id pub-id-type="pmid">18325280</article-id> <article-id pub-id-type="publisher-id">07-0473</article-id> <article-id pub-id-type="doi">10.3201/eid1403.070473</article-id> </article-meta> </front>  </article For convenience in trying to understand this problem, a copy of this document has been placed at [1]. When I issue the following search against this document, I get unexpected results. let $doc := doc('http://blackmesatech.com/2014/LIS590DML/data/testdata.xml') let $path1 := $doc/child::article/child::front /child::article-meta /child::aff[contains(.,"Japan")] /parent::article-meta/child::article-id, $path2 := $doc/descendant::aff[contains(.,"Japan")] /parent::article-meta/child::article-id, $path3 := $doc/article/front/article-meta/aff[contains(.,'Japan')] /../article-id, $path4 := $doc//aff[contains(.,'Japan')]/../article-id, $path5 := $doc//aff/../article-id return (count($path1), count($path2), count($path3), count($path4), count($path5)) What I expect is that path1, path2, path3, path4, and path5 should all return the same results, namely the set of four article-id elements in the document. So the sequence of counts returned should be 4 4 4 4 4. What I am finding is that path1 and path3 are returning 12 results, with each article-id present three times in the result (once, apparently, for every aff element containing the string 'Japan'). Paths 2, 4, and 5 are all returning 4 results each, as I had expected them to. So the sequence of counts actually returned is 12 4 12 4 4. In BaseX 7.6, for what it's worth, this query returns the sequence 12 12 12 12 20, which seems suggestive. Interestingly, if I initialize the variable $doc with a direct element constructor, along the lines of let $doc := document { <article>...</article> } then all counts come out as expected in 7.6, but in 7.9 the result continues to be 12 4 12 4 4. Is this an error in the handling of the / operator, or am I missing some subtle point? Many thanks. [1] http://blackmesatech.com/2014/LIS590DML/data/testdata.xml -- **************************************************************** * C. M. Sperberg-McQueen, Black Mesa Technologies LLC * http://www.blackmesatech.com * http://cmsmcq.com/mib * http://balisage.net ****************************************************************

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how generating wiki from Basex inspect:xqdoc ?
by jean-marc Mercier 06 Oct '14

06 Oct '14

Hi all, I am using BaseX' inspect:xqdoc module to generate xquery docs. I was wondering how generating html pages for accessing this documentation from the web, as for instance Leo did for http://www.woerteler.de/xquery/modules/base64 ?? Thanx cheers, Jean-Marc

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Reg : Reduce Collection Size
by Chandrasekhar 06 Oct '14

06 Oct '14

Dear Team, While creating collection for xml file it is taking double size to the xml file. Please suggest the way to reduce the collection size. We are using the the basex6.7 version Thanks & Regards Chandra Sekhar 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.

2 1

Hierarchy of databases
by Vincent Vandeghinste 30 Sep '14

30 Sep '14

We have set up a system in which we have about 17 million BaseX databases, but my operating system does not allow 17 million subdirectories in one directory ( the one set in the .basex file). In order to resolve this, we had to set up four (4) BaseX servers on four different machines so we could resolve this. Depending on the name of the BaseX database, we know on which BaseX server we have to look. As this is a work around, it would be nice to have either the possibility to have a hierarchy of databases, so we can store them into more manageable directories, or to allow to run more than one BaseX server onto a single machine (for instance, listening on different ports). For more info on the reasons why we did this: Vandeghinste and Augustinus (2014). Making Large Treebanks Searchable. The SONAR case. In Marc Kupietz, Hanno Biber, Harald Lüngen, Piotr Bański, Evelyn Breiteneder, Karlheinz Mörth, Andreas Witt, Jani Takhsha (eds.), Proceedings of the 2nd workshop on Challenges in the management of large corpora (CMLC-2) at the Ninth International Conference on Language Resources and Evaluation (LREC). Reykjavik, Iceland. pp. 15-20. Is there another way to solve this? thanks, v.

2 1

Changing the C# BasexClient.cs
by Nilanjan Dutta 30 Sep '14

30 Sep '14

Hi All, I want to change/overload the implementation private void Send (Stream s) method in the BaseXClient.cs file. [ basex <https://github.com/BaseXdb/basex> / basex-api <https://github.com/BaseXdb/basex/tree/master/basex-api> / src <https://github.com/BaseXdb/basex/tree/master/basex-api/src> / main <https://github.com/BaseXdb/basex/tree/master/basex-api/src/main> / c# <https://github.com/BaseXdb/basex/tree/master/basex-api/src/main/c%23> / *BaseXClient.cs*] *Existing implementation:* private void Send(Stream s) { while (true) { int t = s.ReadByte(); if (t == -1) break; if (t == 0x00 || t == 0xFF) stream.WriteByte(Convert.ToByte(0xFF )); stream.WriteByte(Convert.ToByte(t)); } stream.WriteByte(0); info = Receive(); if(!Ok()) { throw new IOException(info); } } *What I want it to be:* [image: Inline image 1] This one is faster for my use case. Please do let me know how can this be done? Regards, N.D.

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strange webdav behaviour...
by Maud Ingarao 29 Sep '14

29 Sep '14

Hello, We upgrated recently to 7.9 and are experiencing some problems : we get lots of time out and 502 errors when launching heavy queries which used to complete before. then BaseX is totally unavailable and the restart is difficult, some files get corrupted etc. And we discovered a few strange things : - webdav locks seem never to unlock - we had to increase the number of authorized webdav threads and put a restart cron every night otherwise the whole BaseX is becoming unavailable after a few days. - the webdav log file webdav/txt.basex's size quickly increases to an incoherent 4go... It seems that nobody else reported webdav problems, so we really wonder what's wrong with us... All the best :) Maud -- /« Ne travaillez jamais »/ *Maud Ingarao* IHPC (UMR 5037) Institut d’histoire de la pensée classique, de l’Humanisme aux Lumières Ecole Normale Supérieure de Lyon - Site Descartes - Bureau R322 15 Parvis René Descartes - BP7000 - 69342 Lyon CEDEX 07 +33 4 37 37 65 79 - maud.ingarao(a)ens-lyon.fr /Je suis absente le jeudi | Out of office on Thursdays/ http://pensee-classique.ens-lyon.fr http://institutdesanti.ens-lyon.fr http://ahn.ens-lyon.fr http://www.mutec-shs.fr http://cahier.hypotheses.org

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Beginner having trouble starting the HTTP server
by spaelti 29 Sep '14

29 Sep '14

I have tried installing BaseX (both 7.9 and 8 beta) on two machines (both macs) and the GUI works fine. I have now tried following the instructions in “BaseX for dummies” and am having difficulties, when I try to run the HTTP server. On one machine I get the following message: /usr/local/bin/basexhttp: line 11: cd: /usr/local/Cellar/basex/7.9/libexec/../basex: No such file or directory BaseX 7.9 [Server] Server was started (port: 1984) HTTP Server was started (port: 8984) The server seems to be running, but the browser gives me a 404 with this message: HTTP ERROR 404 Problem accessing /. Reason: No function found that matches the request. Powered by Jetty:// “BaseX for dummies” writes: “ … move all the files in the BaseX folder that you modified after installing BaseX … to another location and try again” What does that mean? Where should I move these files to? I didn’t modify any files after installing BaseX. On the other machine, I simply get the message: “command not found” in response to the command “basexhttp”, even though I am in the bin folder and the basexhttp script is present and executable. Any suggestions about what I could try next would be welcome. best Philip Spaelti spaelti(a)mac.com

1 1

Text Index just over some elements
by Oscar Herrera 29 Sep '14

29 Sep '14

Hi, I'm trying to tune my BaseX with a text index only over certain elements, is that possible?, what I have found so far is to create a text index, but I have plenty of nodes on my documents that don't need to be indexed since is very unlikely that a search over that value will occur. So, is there any way in which I can create a text index only over certain elements and not all of them?, if not, is this planned on a near future? Thank you, Oscar H

3 5

Portable database files
by Nilanjan Dutta 26 Sep '14

26 Sep '14

Hello Team, In our project we are planning to use BaseX as XML DB. My main concern is, we don't want to create DB again and again to different machines with same XML file as input and would like to reuse the DB that we'd generate in a server. I see in the "data" directory of my BaseX installation these files are generated when I create a DB by importing an XML: [image: Inline image 1] Would like to know if these can be zipped and ported into different machines and can be used to recreate the DB. Please do let me know how this can be done . Regards, N ilanjan Dutta

3 15

Multi threaded application
by Bondeson, Carl 25 Sep '14

25 Sep '14

I have using BaseX in a canonical manner to handle the many translations used in ELR systems. I won't get into specifics but it has been working well. I started looking into the use of a singleton database object in place of the many ClientSession objects created in the constructor of the associated classes. In a single thread the performance varied between a 2x and 5x decrease. That would be expected since the amount of i/o required to load the XML would be replaced by simply executing queries against the database. The application that is utilizing BaseX is multithreaded. Once I deployed the application in JBoss I continue to receive exceptions: Exception: Unknown Query ID: These class methods are "synchronized" and are being invoked via Xalan callouts from XSLT. I am currently using version 7.9 from the Maven repository. Is BaseX thread safe in this manner? Carl R Bondeson Systems Developer Department of Public Health Data Processing 410 Capitol Ave Hartford, CT 06134 Phone: 860-509-7434 carl.bondeson(a)ct.gov<mailto:carl.bondeson@ct.gov> [cid:image001.jpg@01CFD286.0424E090]<http://www.ct.gov/dph>

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