BaseX-Talk

basex-talk@mailman.uni-konstanz.de

9 participants
5241 discussions

EXPath ZIP Module
by Christian Grün 28 Feb '11

28 Feb '11

Dear all, BaseX now offers (slightly modified) support for the EXPath ZIP Module. This module allows everyone to extract files from ZIP archives, list its contents, create new archives, and update existing archives. As far as we know, our implementation is the first one which is simply usable out of the box, and may be the first complete implementation as well. The ZIP Module is included in our latest build, available at: http://files.basex.org/releases/latest/ Please have a look at our documentation to find more details and examples: http://docs.basex.org/wiki/ZIP_Functions All the best, Christian ___________________________ BaseX Christian Grün Uni KN, Box 188 78457 Konstanz, Germany http://www.inf.uni-konstanz.de/~gruen

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FindBugs for BaseX
by Godmar Back 26 Feb '11

26 Feb '11

2011/2/26 Leonard Wörteler <leonard.woerteler(a)uni-konstanz.de>: > Hi Godmar, > > that bug was pretty easy to fix, and I have no idea how the superfluous > downcast passed all our tests. It was introduced in version 6.2.8. Generally, downcasts are bad software engineering practice and can and should be avoided or minimized by proper design. Either change the method signature to let the compiler flag attends at passing incompatible types, or add virtual methods to a superclass/interface, or (last resort) use instanceof. Findbugs is a tool that flags errors such as these; you may have heard of it. Running Findbugs over the current codebase yields 563 warnings, some of which are clear bugs. I recommend you do that. For example: void delete(final int pre, final int size) { NSNode nd = root.find(pre); if(nd.pre == pre) nd = nd.par; if(nd == null) root = rootDummy; while(!nd.equals(rootDummy)) { nd.delete(pre, size); nd = nd.par; } } if 'nd == null', 'nd.equals()' crashes. If it can't be null, then 'root = rootDummy' is bogus. Or: case GRANT: final CmdPerm perm = consume(CmdPerm.class, cmd); if(perm == null) help(null, cmd); final String db = key(ON, null) ? name(cmd) : null; key(TO, cmd); return db == null ? new Grant(perm, name(cmd)) : new Grant(perm, name(cmd), db); if 'perm' is null, you crash in the 'Grant' constructor when calling perm.toString(). If it can't be null, the check is bogus. Or: @Override public boolean uses(final Use u) { return u == Use.CTX && (def == FunDef.MB || def == FunDef.MB || def == FunDef.EVAL || def == FunDef.RUN) || super.uses(u); } Did you mean to check for two different values instead of FunDef.MB twice. Or: // [CG] XQuery/Formatter: calendars and places are ignored if(cal != null || plc != null); Did you mean to return if cal != null || plc != null rather than doing nothing? Or in FTWrods.java if(iat == null) { final FTLexer lex = new FTLexer(ftt.opt); /* elided */ if(iat == null) { iat = ia; tl = t; } else if(mode == FTMode.M_ALL || mode == FTMode.M_ALLWORDS) { iat = FTIndexIterator.intersect(ia, iat, 0); tl += t; } else { iat = FTIndexIterator.union(ia, iat); tl = Math.max(t, tl); } iat.tokenNum(++ctx.ftoknum); } return iat.more() ? new FTNode(iat.matches(), data, iat.next(), tl, iat.indexSize(), iat.score()) : null; } The code in the else branch is dead - iat is always null where you test it due to the dominating test on entry. The 'intersect' and 'union' call is never made. Etc. well worth the time fixing. - Godmar

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Options to generate JSON file
by Jan Vlčinský (CAD) 26 Feb '11

26 Feb '11

Hi I shall export JSON file based on XML structures I have in my XQuery. Here I found http://demo.exist-db.org/xquery/json-test.xql/source sample, how eXistDB can produce JSON data. It is like import module namespace json="http://www.json.org"; 04. 05.declare option exist:serialize "method=xhtml media-type=text/html"; let $xml1 := 08.<root> 09.<h1>H</h1> 10.<p/> 11.<p>some text</p> 12.<h2>HH</h2> 13.</root> <script type="text/javascript"> 43.var data1 = {json:xml-to-json($xml1)}; BaseX does not provide this and I wonder, what options I have and what would anyone recommend 1. building up plain text piece by piece by XQuery 2. using some Java lib for this (there are more, any practical experience welcome) 3. Some other trick, which lives hidden to me (I already queried BaseX wiki and no hit) Jan -- *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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Server Crash
by Sony Vijay 26 Feb '11

26 Feb '11

Hi, I am using BaseX 6.5. I am running into a server crash. Could you fix it ? I see the following error where I run my server: Exception in thread "Thread-4" java.lang.NullPointerException at org.basex.query.up.Updates.size(Updates.java:110) at org.basex.query.QueryProcessor.updates(QueryProcessor.java:234) at org.basex.server.QueryProcess.initInfo(QueryProcess.java:162) at org.basex.server.QueryProcess.close(QueryProcess.java:139) at org.basex.server.ServerProcess.query(ServerProcess.java:291) at org.basex.server.ServerProcess.run(ServerProcess.java:128) Also, please find attached a copy of the complete log file. Thanks, Sony

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Re: [basex-talk] BaseX question - Enhancing JAX-RX interface
by Jan Vlčinský (CAD) 26 Feb '11

26 Feb '11

Hi Christian I did try to write my ideas, but landed at reading what is REST and what not - and run out of time. So here is draft of some of ideas - unfortunately without clear proposal for next action, but someone will probably take it over and move on. Jan JAX-RX and BaseX - Aim - Summarize ideas and requests regarding JAX-RX interface of BaseX database - Topics - Mixing commands and queries in one request - Get and relevant post implementation without breaking compatibility - Are we REST like and do we need it? - What processing context we need - Typical Use Cases - Add document(s) and optimize - why - Want to be sure, that indexes will be updated after collection has been modified and no one will have a chance to run a query on not optimized collection - Updating query and optimize - why - Want to be sure, that indexes will be updated after collection has been modified and no one will have a chance to run a query on not optimized collection - Query with client defined timeout - why - It is better to quit too long query then risking that one too expensive query would endanger overall server performance There is no need to get query results too late, when our http connection already timed out - Set of independent simple expression queries - Mix updating and simple expression queries - Set of independent commands - why - Needing to run a batch of tasks, which cannot be interrupted by other clients - Ideas - add timeout parameter to each request - check, what other timeout-like parameters we may need - introduce new request element for POST, mixing queries and commands - Possible problems - compatibility with existing design - wish to pass query result into next command/query 2011/2/24 Christian Grün <christian.gruen(a)gmail.com> > > OK, I understand, that REST allows to perform the (SET) command, but to > use > > it with a query, I have to send the query in another, following, request. > > Will this second request keep enough context at the server side to know, > it > > shall use that timeout? > > Just recently, I've thought about extending the JAX-RX Interface to > allow more than a single query or command, or to allow both commands > and queries; regarding the syntax, this could be easily realized for > the GET method: > > http://localhost:8984/basex/jax-rx/factbook?query=1&query=2 > > http://localhost:8984/basex/jax-rx/factbook?command=set+timeout+1&query=1&c… > > On the other hand, I haven't decided yet how to best realize it for > the POST method without giving up compatibility. One solution could be > to introduce alternative "request" root elements: > > <request xmlns="http://jax-rx.sourceforge.net"> > <command> > <text>set timeout 1</text> > </command> > <query> > <text>//name</text> > <parameter name="count" value="5"/> > </query> > </request> > > What does everyone think? > Christian > _______________________________________________ > 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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Re: [basex-talk] Mixing non-updating and updating expressions in a single query
by Sony Vijay 25 Feb '11

25 Feb '11

@Christian and Lukas: Many thanks for helping me with the transform expression so far. However, I am not sure if we can use both non-updating and updating expressions in a single query ? Meaning, I am trying to modify one document and insert the modified document into the second document. *Example:* let $newchild := "This is a child node" copy $c := <entry><title>How to use updating and non-updating expressions together</title> <child>child 1<child> <child>child 2</child> </entry> modify ( for $child in $c//child return replace value of node $child with $newchild ) return insert node $c into doc('seconddocument') I also tried: let $newchild := "This is a child node" copy $c := <entry><title>How to use updating and non-updating expressions together</title> <child>child 1<child> <child>child 2</child> </entry> return modify ( for $child in $c//child return replace value of node $child with $newchild ) insert node $c into doc('seconddocument') Of course, I can achieve this when I use two xqueries (one to return the modified document and the other to insert it into a second document). But, it would be great if I could perform both actions in a single query. Thanks, Sony On Fri, Feb 25, 2011 at 2:54 AM, Christian Grün <christian.gruen(a)gmail.com>wrote: > > I'm sure the somewhat unrelated syntax error message didn't > > help you to find this ... sorry for that. > > I agree with Lukas. I've revised the misleading error feedback; feel > free to check out the latest build: > > http://files.basex.org/releases/latest/ > > C. > ___________________________ > > On Fri, Feb 25, 2011 at 7:46 AM, Lukas Kircher > <lukaskircher1(a)googlemail.com> wrote: > > Hey Sony, > > > > I found another small typo in your query - the keyword 'node' > > is missing in your replace statement. So if you execute the > > query below you should be fine. > > > > for $childentry in $c//childentry > > return replace value of node $childentry/@id with > > concat('New Child: ', data($c//childentry/@id)) > > > > Regards, > > Lukas > > > > > > > > On Thu, Feb 24, 2011 at 11:08 PM, Sony Vijay <sony.vibh(a)gmail.com> > wrote: > >> > >> .. I see the syntax error : > >> [XPST0003] Expecting ")", found "v". > >> when I try : > >> > >> for $childentry in $c//childentry > >> return replace value of $childentry/@id with > >> concat('New Child: ', data($c//childentry/@id)) > >> > >> To modify the child entries like so: > >> <childentry id="1"> ----- > <childentry id="New Child: 1"> > >> > >> On Thu, Feb 24, 2011 at 5:03 PM, Sony Vijay <sony.vibh(a)gmail.com> > wrote: > >>> > >>> ... Replacing the values of attribute nodes doesn't seem to work as > >>> expected when I use modify. Please see my previous post with correction > in > >>> the typo. > >>> > >>> On Thu, Feb 24, 2011 at 5:00 PM, Sony Vijay <sony.vibh(a)gmail.com> > wrote: > >>>> > >>>> Please ignore the typo. My sample xquery looks something like this: > >>>> > >>>> for $childentry in $c//childentry > >>>> return replace value of $childentry/@id with > >>>> concat('New Child: ', data($c//childentry/@id)) > >>>> > >>>> To modify the child entries like so: > >>>> <childentry id="1"> ----- > <childentry id="New Child: 1"> > >>>> > >>>> > >>>> On Thu, Feb 24, 2011 at 4:50 PM, Sony Vijay <sony.vibh(a)gmail.com> > wrote: > >>>>> > >>>>> Christian, > >>>>> Yes. I did realize that I must use a RETURN statement. I tried that > >>>>> with a slight change in the requirement. Say, my child entries look > like so > >>>>> : > >>>>> > >>>>> <childentry id="1" /> > >>>>> I tried: > >>>>> for $childentry in $c//childentry > >>>>> return replace value of $childentry/@id with > >>>>> concat('New Child: ', $c//childentry/text()) > >>>>> Does replace work differently for attributes ? > >>>>> Thanks, > >>>>> Sony > >>>>> > >>>>> > >>>>> On Thu, Feb 24, 2011 at 3:27 PM, Christian Grün > >>>>> <christian.gruen(a)gmail.com> wrote: > >>>>>> > >>>>>> Sony, > >>>>>> > >>>>>> each FLWOR expression needs to be completed with a RETURN statement. > >>>>>> Please insert the following snippet (haven't tried it live): > >>>>>> > >>>>>> for $childentry in $c//childentry > >>>>>> return replace value of $childentry with > >>>>>> concat('New Child: ', $c//childentry/text()) > >>>>>> > >>>>>> Hope this helps, > >>>>>> Christian > >>>>>> ___________________________ > >>>>>> > >>>>>> Christian Grün > >>>>>> Uni KN, Box 188 > >>>>>> 78457 Konstanz, Germany > >>>>>> http://www.inf.uni-konstanz.de/~gruen > >>>>>> > >>>>>> > >>>>>> > >>>>>> On Thu, Feb 24, 2011 at 9:24 PM, Sony Vijay <sony.vibh(a)gmail.com> > >>>>>> wrote: > >>>>>> > Christian, > >>>>>> > Thank you very much for helping me with the query. However, I am > not > >>>>>> > quite > >>>>>> > sure how the transform operation works if I have to use a for > loop. > >>>>>> > Say, I > >>>>>> > twist around yesterday's question a bit like so: > >>>>>> > copy $c := > >>>>>> > <entry> > >>>>>> > <id>1</id> > >>>>>> > <title>How to use a transform expression</title> > >>>>>> > <updated>2011-02-23</updated> > >>>>>> > <author> > >>>>>> > <name>BaseX Team</name> > >>>>>> > <uri>http://basex.org</uri> > >>>>>> > </author> > >>>>>> > <childentry> 1 </childentry> > >>>>>> > <childentry> 2 </childentry> > >>>>>> > <childentry> 3 </childentry> > >>>>>> > <content type="html">Transform expression example created by > BaseX > >>>>>> > Team</content> > >>>>>> > </entry> > >>>>>> > modify ( > >>>>>> > replace value of node $c//name with 'BaseX', > >>>>>> > replace value of node $c//content with concat('Copy of: ', > >>>>>> > $c//content), > >>>>>> > insert node <member>Joey</member> into $c//author > >>>>>> > for $childentry in $c//childentry > >>>>>> > replace value of $childentry with concat('New Child: ', > >>>>>> > $c//childentry/text()) > >>>>>> > ) > >>>>>> > return $c > >>>>>> > > >>>>>> > The expected output is: > >>>>>> > <entry> > >>>>>> > <id>1</id> > >>>>>> > <title>How to use a transform expression</title> > >>>>>> > <updated>2011-02-23</updated> > >>>>>> > <author> > >>>>>> > <name>BaseX</name> > >>>>>> > <uri>http://basex.org</uri> > >>>>>> > <member>Joey</member> > >>>>>> > </author> > >>>>>> > <childentry> New Child: 1 </childentry> > >>>>>> > <childentry> New Child: 2 </childentry> > >>>>>> > <childentry> New Child: 3 </childentry> > >>>>>> > <content type="html">Copy of: Transform expression example > created > >>>>>> > by > >>>>>> > BaseX Team</content> > >>>>>> > </entry> > >>>>>> > The following exception is thrown when I tried my sample > >>>>>> > transformation > >>>>>> > query with the for loop: > >>>>>> > [XPST0003] Expecting 'where', 'order' or 'return' expression. > >>>>>> > Thanks, > >>>>>> > Sony > >>>>>> > PS: @Lukas: I did notice the update in the documentation. Thank > you > >>>>>> > ! > >>>>>> > > >>>>>> > > >>>>>> > On Wed, Feb 23, 2011 at 2:32 AM, Lukas Kircher > >>>>>> > <lukaskircher1(a)googlemail.com> wrote: > >>>>>> >> > >>>>>> >> Hi Sony, > >>>>>> >> > >>>>>> >> to help others with the same question, I allowed myself to > >>>>>> >> add a modified version of your example to our > >>>>>> >> documentation [1]. > >>>>>> >> > >>>>>> >> Regards, > >>>>>> >> Lukas > >>>>>> >> > >>>>>> >> > >>>>>> >> [1] http://docs.basex.org/wiki/Update#transform > >>>>>> >> > >>>>>> >> > >>>>>> >> > >>>>>> >> On Wed, Feb 23, 2011 at 6:58 AM, Sony Vijay <sony.vibh(a)gmail.com > > > >>>>>> >> wrote: > >>>>>> >>> > >>>>>> >>> Christian, > >>>>>> >>> Thank you for the quick and helpful reply. > >>>>>> >>> - Sony > >>>>>> >>> > >>>>>> >>> On Tue, Feb 22, 2011 at 5:56 PM, Christian Grün > >>>>>> >>> <christian.gruen(a)gmail.com> wrote: > >>>>>> >>>> > >>>>>> >>>> Sony, > >>>>>> >>>> > >>>>>> >>>> the following query might do what you want: > >>>>>> >>>> > >>>>>> >>>> copy $c := > >>>>>> >>>> <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> > >>>>>> >>>> modify ( > >>>>>> >>>> replace value of node $c//*:name with 'Sony', > >>>>>> >>>> replace value of node $c//*:content with > >>>>>> >>>> concat('Copy of: ', $c//*:content) > >>>>>> >>>> ) > >>>>>> >>>> return $c > >>>>>> >>>> > >>>>>> >>>> > >>>>>> >>>> Best, > >>>>>> >>>> Christian > >>>>>> >>>> ___________________________ > >>>>>> >>>> > >>>>>> >>>> On Tue, Feb 22, 2011 at 11:43 PM, Sony Vijay > >>>>>> >>>> <sony.vibh(a)gmail.com> > >>>>>> >>>> wrote: > >>>>>> >>>> > 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 > >>>>>> >>>> > > >>>>>> >>>> > _______________________________________________ > >>>>>> >>>> > 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 > >>>>>> >>> > >>>>>> >> > >>>>>> > > >>>>>> > > >>>>> > >>>> > >>> > >> > > > > >

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Re: [basex-talk] Use of For loop in transforming a node without changing the database
by Sony Vijay 25 Feb '11

25 Feb '11

Christian, Thank you very much for helping me with the query. However, I am not quite sure how the transform operation works if I have to use a for loop. Say, I twist around yesterday's question a bit like so: copy $c := <entry> <id>1</id> <title>How to use a transform expression</title> <updated>2011-02-23</updated> <author> <name>BaseX Team</name> <uri>http://basex.org</uri> </author> <childentry> 1 </childentry> <childentry> 2 </childentry> <childentry> 3 </childentry> <content type="html">Transform expression example created by BaseX Team</ content> </entry> modify ( replace value of node $c//name with 'BaseX', replace value of node $c//content with concat('Copy of: ', $c//content), insert node <member>Joey</member> into $c//author for $childentry in $c//childentry replace value of $childentry with concat('New Child: ', $c//childentry/text()) ) return $c *The expected output is:* <entry> <id>1</id> <title>How to use a transform expression</title> <updated>2011-02-23</updated> <author> <name>BaseX</name> <uri>http://basex.org</uri> <member>Joey</member> </author> <childentry> *New Child: 1* </childentry> <childentry> *New Child: 2 *</childentry> <childentry> *New Child: 3* </childentry> <content type="html">Copy of: Transform expression example created by BaseX Team</content> </entry> The following exception is thrown when I tried my sample transformation query with the for loop: *[XPST0003] Expecting 'where', 'order' or 'return' expression.* Thanks, Sony *PS: @Lukas: I did notice the update in the documentation. Thank you !* On Wed, Feb 23, 2011 at 2:32 AM, Lukas Kircher <lukaskircher1(a)googlemail.com > wrote: > Hi Sony, > > to help others with the same question, I allowed myself to > add a modified version of your example to our > documentation [1]. > > Regards, > Lukas > > > [1] http://docs.basex.org/wiki/Update#transform > > > > > On Wed, Feb 23, 2011 at 6:58 AM, Sony Vijay <sony.vibh(a)gmail.com> wrote: > >> Christian, >> >> Thank you for the quick and helpful reply. >> >> - Sony >> >> >> On Tue, Feb 22, 2011 at 5:56 PM, Christian Grün < >> christian.gruen(a)gmail.com> wrote: >> >>> Sony, >>> >>> the following query might do what you want: >>> >>> copy $c := >>> <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> >>> modify ( >>> replace value of node $c//*:name with 'Sony', >>> replace value of node $c//*:content with >>> concat('Copy of: ', $c//*:content) >>> ) >>> return $c >>> >>> >>> Best, >>> Christian >>> ___________________________ >>> >>> On Tue, Feb 22, 2011 at 11:43 PM, Sony Vijay <sony.vibh(a)gmail.com> >>> wrote: >>> > 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 >>> > >>> > _______________________________________________ >>> > 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 >> >> >

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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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