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

indent parameter
by Hans-Juergen Rennau 28 Jun '13

28 Jun '13

Hello, it seems to me there is a couple of issues concerning the handling of indentation (serialization parameter "indent"). a) Using "indent=no" whitespace-only text nodes between element nodes are removed b) Using "indent=yes" the content of elements with xml:space="preserve" is indented, too I suppose both behaviors are in contraction to the spec ( http://www.w3.org/TR/xslt-xquery-serialization/#xml-indent ). As a particular consequence, (a) seems to preclude making an exact copy of a document (fragment) - all whitespace-only text nodes vanish. And as a consequence of (b) one has no possibility to locally protect the whitespace used in the source document, as required for example when reusing "programlisting" elements of docbook. Or did I overlook something? Kind regards, Hans-Juergen

2 3

Corrupt database
by Lars Iversen 28 Jun '13

28 Jun '13

Hi, We are using the REST API with BaseX 7.6. After doing approximately 100 PUT requests for creating documents in a database, we get the error listed below. So far I haven't been able to reproduce it, but I have the database if that would be any help. Any suggestion on how to un-corrupt the database? Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 7.6 Java: Oracle Corporation, 1.7.0_25 OS: Windows 7, x86 Stack Trace: java.lang.RuntimeException: Data Access out of bounds: - pre value: 0 - #used blocks: 0 - #total locks: 0 - access: -1 (0 > -1] org.basex.util.Util.notexpected(Util.java:53) org.basex.io.random.TableDiskAccess.cursor(TableDiskAccess.java:488) org.basex.io.random.TableDiskAccess.read1(TableDiskAccess.java:189) org.basex.data.Data.kind(Data.java:283) org.basex.query.value.node.DBNode.<init>(DBNode.java:49) org.basex.query.value.seq.DBNodeSeq.get(DBNodeSeq.java:108) org.basex.query.value.seq.DBNodeSeq.get(DBNodeSeq.java:96) org.basex.query.QueryResources.compile(QueryResources.java:62) org.basex.query.QueryContext.compile(QueryContext.java:200) org.basex.query.QueryProcessor.compile(QueryProcessor.java:66) org.basex.query.QueryProcessor.execute(QueryProcessor.java:95) org.basex.query.QueryProcessor.queryNodes(QueryProcessor.java:204) org.basex.core.cmd.AQuery.queryNodes(AQuery.java:185) org.basex.core.cmd.Cs.run(Cs.java:23) org.basex.core.Command.run(Command.java:342) org.basex.core.Command.exec(Command.java:321) org.basex.core.Command.execute(Command.java:78) org.basex.server.LocalSession.execute(LocalSession.java:122) org.basex.server.Session.execute(Session.java:37) org.basex.http.rest.RESTCode.open(RESTCode.java:43) org.basex.http.rest.RESTRetrieve.run(RESTRetrieve.java:41) org.basex.http.rest.RESTGet.run(RESTGet.java:67) org.basex.http.rest.RESTServlet.run(RESTServlet.java:14) org.basex.http.BaseXServlet.service(BaseXServlet.java:39) javax.servlet.http.HttpServlet.service(HttpServlet.java:848) org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:648) org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455) org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:559) org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:232) org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072) org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382) org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:194) org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006) org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) org.eclipse.jetty.server.Server.handle(Server.java:365) org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485) org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926) org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988) org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635) org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:627) org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:51) org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) java.lang.Thread.run(Unknown Source) Med venlig hilsen / Kind regards [Description: Systematic Logo]<http://www.systematic.com/> Lars Iversen Senior Systems Engineer Søren Frichs Vej 39, 8000 Aarhus C Denmark Mobile: +45 4196 5164 Lars.Iversen(a)systematic.com<mailto:Lars.Iversen@systematic.com> www.systematic.com<http://www.systematic.com>

2 1

One long running read query blocking other read xqueries execution
by Srinivasan Muthu 26 Jun '13

26 Jun '13

I use BaseX 7.7 build from couple days ago with GLOBALLOCK=false. I run using client-server mode. I have one long running read-only xQuery (say query1) that needs to be optimized but for now it takes about 3 minutes to run. While query1 is running all other read-only xQueries are queued up (from BaseX server logs) and wait for query1 completion. After query1 is done, all other xQueries get executed one after the other. Note query1 only accesses one document and all other xQueries run in parallel operate on a different document. Before I debugged this more, can you let me know if a read-only query can block other read-only query? and if so any hints at where I should look at? I am also in the process of debugging this more, so if I can get a sample code ready, I will share with you guys soon for making this easy. Thanks, Srini

2 2

Out of Main Memory; bytea type
by Alexander von Bernuth 24 Jun '13

24 Jun '13

Hello all, my basex-script should fetch 10.000something XML-files automatically from a website and insert their content into a external PostgreSQL-database. After about 8.000 files my script stops and I get "Out of Main Memory". I found your discussion with "kgfhjjgrn" [1] regarding this issue, but I'm not sure whether these options apply to my problem - I do not build a basex-database but an external one. Will autoflush=false and flushing by myself help with this? Second, I want to insert some xs:base64Binary into my PostgreSQL database, but I cannot find the correct sql:parameter type for the bytea-column. Could you please help me with my issues? Thank you very much, Alexander [1] http://comments.gmane.org/gmane.text.xml.basex.talk/2540 -- | Alexander von Bernuth | alexander.von-bernuth(a)student.uni-tuebingen.de

2 4

BaseX and XML 1.0/1.1 names (and other implementation-defined items)
by C. M. Sperberg-McQueen 24 Jun '13

24 Jun '13

For reasons I won't go into here, I have developed a desire to know something I've never particularly wondered about in the past: Which version of XML NCNames does BaseX use? The one given in XML 1.0 5th edition and in XML 1.1? or the one given in earlier versions of XML? And while I'm looking for implementation-defined properties -- is there a place in the documentation that lists BaseX's decisions on the various implementation-defined items listed in http://www.w3.org/TR/xpath20/#id-impl-defined-items and http://www.w3.org/TR/xquery/#id-impl-defined-items ? I did a search in the documentation for "implementation-defined" but did not find any likely candidates among the hits; I may have overlooked it, though. -- **************************************************************** * C. M. Sperberg-McQueen, Black Mesa Technologies LLC * http://www.blackmesatech.com * http://cmsmcq.com/mib * http://balisage.net ****************************************************************

2 1

Error messages from BaseX.main()
by Brock, David 19 Jun '13

19 Jun '13

I want to call BaseX.main() from a Java GUI and need to display errors to the user. There are no exceptions thrown by this method, and I do not see a way to redirect so that I can capture and display. Thanks, David

2 2

Best practices for concurrency
by The Trainspotter 19 Jun '13

19 Jun '13

Hi, I've read through the online example on server concurrency, however, currently I'm not running a BaseXServer instance I'm just running things locally. I want multiple threads in my application to be able to query the database at once without treading on each others toes. What's the best approach for doing this? I have tried querying the database using different threads but I keep getting internal BaseX errors which leads me to think I'm going about this the wrong way. Cheers Gary

5 15

basex client can't connect: Can't communicate with the server.
by Paul Collins 18 Jun '13

18 Jun '13

Hi, I use basex on Debian wheezy with Oracle Java version 1.6.0_43. Whenever I try to connect to the basex server the client tells me "Can't communicate with the server." If I enable a netcat server on port 2000 for test reasons and run wireshark in order to capture the traffic I get no traffic on port 2000, not even the TCP three way handshake by running this command: java -cp BaseX77.jar org.basex.BaseXClient -p2000 -n localhost -d Do you have any suggestions why as far as I can see the basex client doesn't even try to connect to port 2000 on localhost but just prints that it can't communicate with the server? Best regards, Paul

3 7

bug in processing XPATH with this simple regular expression?
by Imbuter Imb 17 Jun '13

17 Jun '13

Take this input: <div id="ps-content">foobar</div> and apply this XPATH 2+: //div[matches(@id,"^s-content$")] In BaseX command-line it matched! despite the fact that "^" in regex language means "the start of the string". With Saxon and Xidel command-line it correctly doesn't match. Why does it match in BaseX?

2 1

An inconvenient truth . . ?
by Christopher.R.Ball 15 Jun '13

15 Jun '13

Am I correct in assuming I have hit a dreaded limit of BaseX when I see the output below? Which I presume may be the node limit (2,147,483,648) . . ? As I am dealing with 689,701 Files in 814,855 Folders which amounts to 5.32 GB on disk. (I am running BaseX 7.7) If so, then are then any automated ways of having BaseX automatically start feeding to a second instance? It would be nice to NOT have to manually partition the content in advance. Thoughts? ..................................;...................................;...............................;................. .......;.......;......;.......;.............;.................org.basex.build.BuildException: "825646564637.xml" (Line 3 5100): Input is too large for a single database. at org.basex.build.Builder.limit(Builder.java:327) at org.basex.build.Builder.addElem(Builder.java:315) at org.basex.build.Builder.openElem(Builder.java:111) at org.basex.build.xml.XMLParser.parseTag(XMLParser.java:176) at org.basex.build.xml.XMLParser.parse(XMLParser.java:88) at org.basex.build.SingleParser.parse(SingleParser.java:33) at org.basex.build.DirParser.parseResource(DirParser.java:180) at org.basex.build.DirParser.parse(DirParser.java:110) at org.basex.build.DirParser.parse(DirParser.java:90) at org.basex.build.DirParser.parse(DirParser.java:90) at org.basex.build.DirParser.parse(DirParser.java:90) at org.basex.build.DirParser.parse(DirParser.java:90) at org.basex.build.DirParser.parse(DirParser.java:90) at org.basex.build.DirParser.parse(DirParser.java:79) at org.basex.build.Builder.parse(Builder.java:73) at org.basex.build.DiskBuilder.build(DiskBuilder.java:90) at org.basex.build.DiskBuilder.build(DiskBuilder.java:1) at org.basex.core.cmd.Add.run(Add.java:103) at org.basex.core.Command.run(Command.java:345) at org.basex.core.Command.exec(Command.java:321) at org.basex.core.Command.execute(Command.java:78) at org.basex.server.LocalSession.execute(LocalSession.java:122) at org.basex.server.Session.execute(Session.java:37) at org.basex.core.Main.execute(Main.java:146) at org.basex.core.Main.execute(Main.java:130) at org.basex.core.Main.execute(Main.java:117) at org.basex.BaseX.<init>(BaseX.java:79) at org.basex.BaseX.main(BaseX.java:39)

2 1