BaseX-Talk

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by mgawinecki＠gmail.com 15 Jul '10

15 Jul '10

I have a collection of XML documents formated with respected to a pre-defined stable schema (WSDLs---Web service definitions). I need to execute (from PHP) search over XML documents. I wonder whether xBase: (1) scores relevance of whole matching XML documents and ranks them (in any way) ? (2) allows to identify (in matching document) XML elements with matched query terms and than navigating to parental/children nodes in XML structure ? (3) provides a way to give more weight to some XML element types during relevance scoring ? Best regards, Maciej

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Feature Request
by Andy Chambers 14 Jul '10

14 Jul '10

Hi Christian, A while ago, you were soliciting feature requests so here's mine :-) It would be nice if there was some way to perform XSLT transforms on the results of a query. I'd be happy to implement this if you gave me a few pointers about where you think it would fit in the best. My guess would be to make a XSLT filter and attach it to the OutputStream that is passed to Proc.exec. I'm not sure about how to decide when to apply which stylesheets so I'm open to suggestions here. From a user point of view, I think it would be nice to have a "style" parameter on the REST interface that allows one to specify a stylesheet. Cheers, Andy

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Re: [basex-talk] Using "define function ...."
by Christian Grün 13 Jul '10

13 Jul '10

Hi Johanna, it looks as if your quoted example from the »XQuery Kick Start« books is XQuery-only, ignoring other languages such as PHP, so (I guess?) it's quite comparable to the example I proposed below. The only difference is the XQuery syntax, which has changed in the final W3 Recommendation: Old: define function func() { ... }; Final: declare function local:func() { ... }; Regarding the mix of PHP and XQuery, unfortunately, you won't be able to "import" any XQuery functions. Instead, you'll have to decide which world world you prefer – currently, they are just too different to go hand in hand. Does this come closer to your initial question? Christian On Tue, Jul 13, 2010 at 5:24 PM, Johanna Vompras <johanna.vompras(a)uni-bielefeld.de> wrote: > Hi Christian, > > thanks for the quick answer and the example! Yes, Xquery seems to have > many advantages. Although this example do not 100% match what i have in > mind. My intention is first to query the XML Database and transfer the > results to a function (in the above example FUNCTION) > This function should then dynamically be invoked on the results. > > $cmd = 'for $node in doc("factbook")//country return FUNCTION($node)'; > > But where can I define this function withhin my .php file ... > Is there a possibility to say "import FUNCTIONSFILE.xquery" ???? > Maybe I understand something wrong ... > > I have also found this example, it is nearly that what I have in mind > (but I didn't get it to run!) > > http://www.informit.com/articles/article.aspx?p=101764&seqNum=11 > > In principle, I want to apply external functions on my xquery results. > > Hope it does not sount very confusing ... > > Thanks for helping > > Johanna. > > > > Am 13.07.2010 16:59, schrieb Christian Grün: >> Hi Johanna, >> >> your questions are welcome – I'm just forwarding them back to the >> mailing-list, as they might be interesting for others as well. >> >> The most elegant way to use XML is actually to build the larger >> snippets in XQuery (although our php table example points to another >> direction…). In the beginning, this might sound tedious, but it's >> worth the time; XQuery is pretty simple, compared to e.g. XSLT, and, >> yet, very manifold and powerful enough to construct very complex >> XML/HTML snippets. The BaseX GUI Editor might help you to get to know >> the language (you'll immediately see the query results after each key >> click if you choose "Options->Realtime Execution"). >> >> XQuery is often called an »Information Processing Language«, which >> means that it allows much more than other query languages, such as >> SQL. >> >> The following snippet shows you how to construct an HTML table via XQuery: >> >> (: Beginning of Query :) >> <table border='0'> >> <tr> >> <th>Name</th> >> <th>Population</th> >> </tr> >> { >> for $country at $p in //country >> let $color := if($p mod 2) then '#eeeeee' else '#ffffff' >> return >> <tr style="background-color:{ $color };"> >> <td>{ data($country/name) }</td> >> <td>{ data($country/@population) }</td> >> </tr> >> } >> </table> >> (: End of Query :) >> >> Note that your XQuery results will always be well-formed, which isn't >> the case for PHP. Said this, it is even more elegant to construct >> complete HTML documents in XQuery – but this will surely render the >> source files more unreadable for non-XQuery-folks. >> >> Feel free to ask for more, >> Christian >> >> ___________________________ >> >> On Tue, Jul 13, 2010 at 4:34 PM, Johanna Vompras >> <johanna.vompras(a)uni-bielefeld.de> wrote: >>> Hi Christian, >>> >>> Thank you! >>> I have just tried it out (throught the BaseX-Api) and it works. My Question >>> now is, how to link this a functionality into a .php file, e.g. the >>> TableExample.php which can be downloaded from >>> https://svn.uni-konstanz.de/dbis/basex/trunk/api/etc/php/ . >>> It looks like: >>> >>> include("BaseXClient.php"); >>> >>> // commands to be performed >>> $cmd = 'for $node in doc("factbook")//country order by >>> xs:int($node/@population) return data($node/@name)'; >>> $cmd2 = 'for $node in doc("factbook")//country order by >>> xs:int($node/@population) return data($node/@population)'; >>> >>> try { >>> // create session >>> $session = new Session("localhost", 1984, "admin", "admin"); >>> >>> echo "<table border='0' cellspacing='2' cellpadding='4' width='20%'> >>> <tbody><tr style='text-align:center;'><tbody><tr >>> style='text-align:center;'>"; >>> echo "<td style='text-align:center;background-color:#D7D7D7;border:#ffffff >>> 1px solid;font-size:12pt;'></td>"; >>> echo "<td style='text-align:center;background-color:#D7D7D7;border:#ffffff >>> 1px solid;font-size:12pt;'>Country</td>"; >>> echo "<td style='text-align:center;background-color:#D7D7D7;border:#ffffff >>> 1px solid;font-size:12pt;'>Population</td>"; >>> try { >>> $query = $session->query($cmd); >>> $query2 = $session->query($cmd2); >>> $count = 0; >>> while($query->more()) { >>> >>> ............ etc ... >>> >>> Where schould I define a such user-defined function, so I can allready use >>> it in the xquery statement? In the $cmd variable before the xquery >>> expression? It is not an elegant way .... Is there a possibility to include >>> some XQuery functions from en external file, by saying: "include ...." ??? >>> >>> Sorry for so much questions!! >>> >>> Thanks! >>> >>> Johanna. >>> >>> >>> >>> Am 13.07.2010 16:24, schrieb Christian Grün: >>>> >>>> Johanna, >>>> >>>> specifying nodes as arguments is straight-forward in XQuery; this >>>> expression might do what you want: >>>> >>>> declare function local:createTable($n as node()) as node()* { >>>> for $c in $n/* >>>> return<result/> >>>> }; >>>> for $node in doc("database")//node >>>> return local:createTable($node) >>>> >>>> >>>> Hope this helps, >>>> Christian >>>> >>>> >>>> >>>> On Tue, Jul 13, 2010 at 3:02 PM,<johanna.vompras(a)uni-bielefeld.de> wrote: >>>> >>>>> >>>>> Hi, I am relatively new to baseX and XQuery and just trying the >>>>> funcionalities of BaseX. I have got some questions on the possibility of >>>>> defining user-defined functions, which take a node (or a node set) as >>>>> parameters and process them subsequently (e.g. format the results as an html >>>>> table, or another numerical computations etc.). >>>>> >>>>> This might look like this: >>>>> >>>>> define function createTable($n as node) >>>>> { >>>>> for $c in $n/* return<some html-output>; >>>>> } >>>>> >>>>> and I would like to use the defined function "createTable" in a xquery >>>>> expression. For example : >>>>> >>>>> for $questionscheme in doc("database")//d:QuestionScheme return >>>>> createTable($questionscheme/node()) >>>>> >>>>> That means I need to pass a whole node (not the query results as string), >>>>> in order to process the node with further xquery expressions. Is this >>>>> compatible with BaseX? And where should I define such functions? Defining a >>>>> function through the XQuery-API does not work. The functions in class Query >>>>> in the BaseXClient.php seem to only support a successive query processing >>>>> (one result tuple after another). Or have I overseen something? If not, can >>>>> this class be quickly modified to support this? >>>>> >>>>> Many thanks for your help on this! >>>>> >>>>> >>>>> _______________________________________________ >>>>> BaseX-Talk mailing list >>>>> BaseX-Talk(a)mailman.uni-konstanz.de >>>>> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>>> >>>>> >>> >>> > > -- > Dr. Johanna Vompras > Universität Bielefeld - Universitätsbibliothek > Universitätsstr. 25, Office A2-136 > 33615 Bielefeld > > Fon +49 (0) 521/106-2644 > Fax +49 (0) 521/106-4052 > Skype johanna.vompras >

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Using "define function ...."
by johanna.vompras＠uni-bielefeld.de 13 Jul '10

13 Jul '10

Hi, I am relatively new to baseX and XQuery and just trying the funcionalities of BaseX. I have got some questions on the possibility of defining user-defined functions, which take a node (or a node set) as parameters and process them subsequently (e.g. format the results as an html table, or another numerical computations etc.). This might look like this: define function createTable($n as node) { for $c in $n/* return <some html-output>; } and I would like to use the defined function "createTable" in a xquery expression. For example : for $questionscheme in doc("database")//d:QuestionScheme return createTable($questionscheme/node()) That means I need to pass a whole node (not the query results as string), in order to process the node with further xquery expressions. Is this compatible with BaseX? And where should I define such functions? Defining a function through the XQuery-API does not work. The functions in class Query in the BaseXClient.php seem to only support a successive query processing (one result tuple after another). Or have I overseen something? If not, can this class be quickly modified to support this? Many thanks for your help on this!

2 1

support for EventTarget appears to be missing
by Godmar Back 11 Jul '10

11 Jul '10

Hi, the Elements returned by XQResultItem.getNode() don't appear to support the EventTarget interface: org.basex.api.dom.BXElem cannot be cast to org.w3c.dom.events.EventTarget This means we need to serialize the node to an XML string, then parse that string to obtain a org.w3c.dom.Node instance that supports this interface. This is awkward and highly inefficient. Why doesn't BaseX support EventTarget (or use the existing DOM implementation provided with Java, which does support DOM events?) - Godmar

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XQST0049 error in BaseX 6.1 that did not occur in BaseX 6.0
by Godmar Back 11 Jul '10

11 Jul '10

Hi, I recently upgraded to BaseX 6.1. I now receive an error when running a query that run without complications in BaseX 6.0 The offending query has this prolog: declare namespace libx='http://libx.org/xml/libx2'; declare namespace atom='http://www.w3.org/2005/Atom'; declare variable $metadata as xs:anyAtomicType := doc('libx2_meta')/metadata; declare variable $feed as xs:anyAtomicType := doc('libx2_feed')/feed; which results in *declare variable $metadata as xs:anyAtomicType := doc('libx2_meta')/metadata;* ^ javax.xml.xquery.XQQueryException: Stopped at line 3, column 48: [XQST0049] Duplicate definition of $metadata as xs:anyAtomicType. at org.basex.api.xqj.BXQDynamicContext.execute(BXQDynamicContext.java:251) at org.basex.api.xqj.BXQPreparedExpression.executeQuery(BXQPreparedExpression.java:54) at org.libx.libappdatabase.Query.main(Query.java:100) Simply exchanging BaseX61.jar with BaseX6.jar makes this query work as expected. I note that if I switch lines 3 and 4 (so that the 'declare variable $feed' appears first), the error is flagged on this line. The query runs fine using the command-client in both BaseX 6 and 6.1 I'm using org.basex.api.xqj.BXQDataSource, following by prepareExpression, followed by executeQuery. This query has no external variables. Another point of information: out of curiosity, I printed information about the prepared expression after prepareExpression like so: System.out.println("external vars: " + Arrays.asList(pe.getAllExternalVariables())); System.out.println("unbound vars: " + Arrays.asList(pe.getAllUnboundExternalVariables())); this shows 'metadata' and 'feed' as external variables: external vars: [metadata, feed] unbound vars: [] Why are 'metadata' listed as external, even though they are not declared as such? I would appreciate any insight. If the problem is mysterious, I can prepare a self-contained test case or aid in debugging. Thanks. - Godmar [*] http://top.cs.vt.edu/~gback/bx/get_connected_tree.xq

3 7

setting the BaseX directory
by Godmar Back 11 Jul '10

11 Jul '10

Hi, we use BaseX in a Tomcat server on Linux. We run multiple instances of our application as different web applications in that server. A problem we encountered is that BaseX refers to the 'user.home' property when identifying the location of its .basex configuration file. This property is related to which (Linux) user started the Tomcat server, which is unrelated to the web application that needs to start a BaseX instance. We are now using a very awkward work-around: temporarily setting 'user.home' to the desired value, then touching a class in org.basex.core to force its initialization: oldUserHome = System.getProperty("user.home"); System.setProperty("user.home", basexdir); if (!org.basex.core.Prop.HOME.startsWith(basexdir)) throw new java.lang.Error("BaseX property initialization failed"); System.setProperty("user.home", oldUserHome); Could a programmatic way to initialize BaseX be provided that does depend on system properties? I understand that it will require a small amount of refactoring (given how deep this assumption is wired into the code), but it is absolutely necessary to facilitate the use of BaseX in shared environments such as Tomcat. Thanks. - Godmar

2 3

startjaxrx
by Andy Chambers 10 Jul '10

10 Jul '10

Hi All, The startjaxrx script doesn't add all the necessary jars to the classpath before starting BaseX. Changing it to the following worked for me.... #!/bin/bash # Script for running the JaxRx server # Path to this script PWD=`dirname $0` # Check: path to BaseX binary BXPATH=$PWD/BaseX61.jar # Classpath LIB=$PWD/lib CP=$PWD/BaseX61-jaxrx.jar:${BXPATH} for jar in ${LIB}/*.jar do CP=${CP}:${jar} done # Assign more memory VM=-Xmx1g # Run JaxRx java -cp "$CP:." $VM StartJaxRx -- ---- Andy Chambers Formedix Ltd

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Re: [basex-talk] PHP: How can I get the name of the xquery function where an error occurred?
by Christian Grün 09 Jul '10

09 Jul '10

Dear Nigel, line and column information is omitted in error messages returned by the server. One solution to get more feedback is to use the BaseX API or the command line of BaseX, or to directly test your query in the BaseX GUI Editor. Your request is a good hint, though; we might add extended server feedback in the next minor release. Christian On Fri, Jul 9, 2010 at 7:58 PM, Nigel Alderton <nigel.alderton(a)bigtooth.co.uk> wrote: > If I get an error message like this: > > [XPST0003] Incomplete 'let' expression. > > How can I find out more information regarding the error eg. the name of the > function that failed? The error message doesn’t give any clue about where > the error occurred. > > I’m using PHP. My code is based on the example code supplied with BaseX. > > <?php > > include("BaseXClient.php"); > $CMD_OPEN = "open cgd-dat"; // BaseX command to open the database. > $xq = "xquery ... a long xquery"; // BaseX xquery command. > > try { > $session = new Session("localhost", 1984, "admin", "admin"); > $session->execute($CMD_OPEN); > print $session->execute($xq); > $session->close(); > } catch (Exception $e) { > print $e->getMessage(); > }

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PHP: How can I get the name of the xquery function where an error occurred?
by Nigel Alderton 09 Jul '10

09 Jul '10

If I get an error message like this: [XPST0003] Incomplete 'let' expression. How can I find out more information regarding the error eg. the name of the function that failed? The error message doesn't give any clue about where the error occurred. I'm using PHP. My code is based on the example code supplied with BaseX. <?php include("BaseXClient.php"); $CMD_OPEN = "open cgd-dat"; // BaseX command to open the database. $xq = "xquery ... a long xquery"; // BaseX xquery command. try { $session = new Session("localhost", 1984, "admin", "admin"); $session->execute($CMD_OPEN); print $session->execute($xq); $session->close(); } catch (Exception $e) { print $e->getMessage(); } ?>

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