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

xmldb for other program languages
by Philipp Kamps 10 Mar '10

10 Mar '10

Hi, how could I connect to a BaseX server with PHP? I probably could implement a "PHP to Java wrapper" around BaseX xml:db or XQJ. Would a direct communication to the BaseX server make more sense? So open a socket in PHP and implement a PHP API on top of the protocol BaseX uses? I tried to gather some info about that protocol but couldn't find much. What's your recommendation? Should I drop that idea completely? Regards, Philipp

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Re: [basex-talk] URL connection for Geo code service
by Christian Grün 09 Mar '10

09 Mar '10

Thanks Erol, an important hint; the bug should now be fixed. Christian ps: as this might be interesting for others as well, I have forwarded this answer to the basex-talk mailing list. On Tue, Mar 9, 2010 at 7:30 PM, Erol Akarsu <eakarsu(a)gmail.com> wrote: > Christian, > > I would like to execute Google geocode service like this in xquery but > receiving error: > > let $url1 := > "http://maps.google.com/maps/geo?q=618+Bland+Blvd,+Newport+News,+VA+23602&am…" > > return fn:doc($url1) > > > Error: [FODC0002] > C:\Users\ErolAkarsu\BaseXData\geo?q=618+Bland+Blvd,+Newport+News,+VA+23602&output=xml&sensor=false&client-gme-ferguson\tbl.basex > (The filename, directory name, or volume label syntax is incorrect) > > Can you give a hint on how I can achieve this? > > Thanks > > Erol Akarsu ___________________________ Christian Gruen Universitaet Konstanz Department of Computer & Information Science D-78457 Konstanz, Germany Tel: +49 (0)7531/88-4449, Fax: +49 (0)7531/88-3577 http://www.inf.uni-konstanz.de/~gruen

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session not associated with database
by Swaminathan S 09 Mar '10

09 Mar '10

Hi, In a client-server interaction with BaseX database, I see the ClientSession object is not associated with a database, in the usual manner(Usually, a session is established with a particular database at session creation time). Please let me know if my understanding is right: When we I do the following: *Line 1*: ClientSession session = new ClientSession("localhost", 1984, "admin", "admin"); *Line 2*: session.execute("OPEN databaseA"); *Line 3*: session.execute("XQUERY <some xquery>"); *Does "Line 2" bind the session with databaseA?(*So, I am assured that Line 3 executes on databaseA?) Thanks and regards, Swaminathan Sahiram

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XQuery - Collections support
by Christian Grün 09 Mar '10

09 Mar '10

Hi everyone, as we are frequently being asked how documents can be added to existing collections via XQuery Update – which isn't possible right now – you might be interested to hear that XQuery could be extended into that direction in future. The following paper shows a discussed extension: "Extending XQuery with Collections, Indexes, and Integrity Constraints" http://www.flworfound.org/publications.shtml Best, Christian ___________________________ Christian Gruen Universitaet Konstanz Department of Computer & Information Science D-78457 Konstanz, Germany Tel: +49 (0)7531/88-4449, Fax: +49 (0)7531/88-3577 http://www.inf.uni-konstanz.de/~gruen

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Multiple Request Handling by BaseX
by Swaminathan S 09 Mar '10

09 Mar '10

Hi, Suppose BaseX receives several requests(updates/queries) (on same or different xml) almost simultaneously, how will BaseX handle this? I mean does BaseX queue all requests and process one by one or the application querying BaseX needs to ensure that a second request does not reach BaseX till the first request is completed by BaseX? Since I am working on an application that handles operations for multiple xmls parallely, I need to design the concurrency aspect. Thanks and regards, Swaminathan S

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version 6.03 details
by Swaminathan S 09 Mar '10

09 Mar '10

Hi, I would like to know: 1) the features and fixes in version 6.03 (versus version 6.0) 2) Is version 6.03 as stable as/better than version 6.0? (we are considering to migrate to the latest minor release). Thanks, Swaminathan Sahiram

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XSLT processor on persistent DOM?
by sebastian.wiemer＠bertelsmann.de 09 Mar '10

09 Mar '10

Hello, is there an XSLT processor available operating on the persistent DOM? I would like to avoid "in memory" transformations elevating the memory usage. Sebastian

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This appears to be a bug
by Phil 08 Mar '10

08 Mar '10

With the 6.0 released version of BaseX.exe in Windows 7 (x64) I am encountering a serious problem, or problems. All of them relate to handling of empty sequences. A simple example is of the form: let $vcheck:=($versions,$v0) If, e.g., $versions is a non-empty sequence, but $v0 is an empty sequence, I get [XPTY0004] Invalid cast from empty-sequence to node: () To try to route around this problem I even tried something such as: let $vcheck:=if (empty($v0)) then $versions else($versions,$v0) Not even this works - I get the same error originating from the 'else' clause. In my view this probably exposes a second bug as well: the "else" clause is clearly being evaluated despite the fact that the 'if' test is true. In addition to being inefficient, this is guaranteed to cause problems in many cases, e.g., if the result of the 'else' evaluation led to something such as division by zero. Right now, I can't figure out a way to get around the problem of handling an empty sequence in any way as a workaround. (The 'union' operator also fails when one of the operands is an empty sequence, which also seems wrong.) I've tested the () sequencing in Altova XMLSpy (as an XPath 2.0 expression against a document) and it behaves as expected, simply ignoring empty sequences. Because I can't find a way to work around it presently, I would classify this as a major problem.

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Problems with XML DB api
by Jiří Kadlec 08 Mar '10

08 Mar '10

Hi, I'm having a problem with XML DB, when I'm trying to access result as DOM. I'm using this code sequence: if (res instanceof XMLResource){ XMLResource resource = (XMLResource) res; Node node = resource.getContentAsDOM(); System.out.println("Get content: " + resource.getContent()); System.out.println("Node je: " + node.getNodeName()); } everytihng goes ok, when i use resource.getContent(), i got expected results but when I try to use resource.getContetAsDOM() a got following exception: Exception in thread "main" java.lang.NullPointerException at org.basex.query.item.DBNode.<init>(DBNode.java:50) at org.basex.api.xmldb.BXXMLResource.getContentAsDOM(BXXMLResource.java:144) at testmxquery.XQueryDatabaseSample.main(XQueryDatabaseSample.java:186) Java Result: 1 I'm using modified example from your web site. Thanks for your help Jiri

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Problems with function transormation function put and namespaces
by Jiří Kadlec 08 Mar '10

08 Mar '10

Hi Guys, I'm have problems with BASE-X and namespaces when I'm using put function for e.g declare namespace bk := "http://acision.com.uri"; put( copy $nn := doc('D:/tstxml.xml') modify insert node <x/> into $nn/site/region/bk:africa return $nn, 'D:/tstxml.xml') start of the tstxml.xml look like this <site xmlns:bk="http://acision.com.uri"> <regions> <bk:africa> I found out that when I use this the same query without specifying namespace it inserts element <x/> into bk:africa but it changes the document and it looks like: <site > <regions> <bk:africa xmlns:bk="http://acision.com.uri"> .... ... </x> </bk:africa> Is this a bug or am I doing something wrong? I need to use namespace prefix in put function is it possible or it's not supported by BASE-X at all? Thank for help Jiri

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