BaseX-Talk July 2015

basex-talk@mailman.uni-konstanz.de

35 participants
50 discussions

Whitespace
by meumapple 14 Jul '15

14 Jul '15

Hi, When I use the file:write function, the whitespaces before an element are deleted (and also the initial whitespace of a string in an element). This is a problem for elements containing text and elements. Is there a way to avoid this? Thanks. J.

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HTTP module and cookies
by Lizzi, Vincent 14 Jul '15

14 Jul '15

I am using BaseX to scrape data from a web site. This web site, probably like many other websites, relies on cookies and if it does not receive the expected cookies it delivers a page instructing you to enable cookies in your browser. I was able to get this working by parsing the http:header response to get the cookies to use in subsequent requests. This is the second time I've done this, and even though this works it seems a bit hacky. Is there a standard way of handling cookies using the HTTP Module or the Fetch module? Or, are there any well written code examples available? In other environments typically you define a cookie jar in some way, and the cookie jar is used (and is updated) automatically in all subsequent HTTP requests. I'm hoping to find something similar in BaseX. Thanks, Vincent

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Reporting function for a subset
by Menashè Eliezer 14 Jul '15

14 Jul '15

Hello, I want to call a reporting function with a subset of documents created inside a loop which will return a xml report. I couldn't find information how and if can it be done. The idea is that there is a main query which results in a subset. Then I want to make different processing only on this subset without making a query on the whole collection with the filters, as I've already done in the main query. The all-in-one query will actually return inside my own xml the results of the different functions. Is it possible? -- With kind regards, Menashè

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BaseX 8.2.3
by Christian Grün 14 Jul '15

14 Jul '15

Dear all, Just one week passed, and a new version of BaseX is available. It provides a fix for a minor problem with the DBA code and some namespace issues. All the best, Christian

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Behaviour of doc() changed?
by Marco Lettere 14 Jul '15

14 Jul '15

Hello, when using doc() we used to pass into it a relative (to the static base uri) filesystem path to an xml file. This was parsed without any problems. Now (basex 8.2.2) the parsing works but we get on the standard output stating that the database (named as the first path element) does not exist. I understand that the doc function first looks up the database server and then accesses the filesystem. Is it like that? Has this changed or is the exception just printed out whereas in previous versions it was not? Regards, Marco.

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DBA - display the number of results from a query
by James Ball 14 Jul '15

14 Jul '15

Hello, I’m finding the web DBA functionality of BaseX more and more useful but one thing I really miss from the GUI is the display of the number of results in the top right corner. Many times when I’m running a quick query I want to know how many results there are and see at least an example of the results (as often the full set is too long to be displayed). I know I could add count() round the query and run it again but I’m lazy. :) So, I’m thinking it would be good to add the total results to the DBA Queries page I was about to start putting some code together when I realised I don’t know what would be the most efficient way to do this - so I’m turning to the list to see if a) other people think this would be useful, and b) what suggestions people have of the best way to do it. I’m thinking of returning the total count as an HTTP header so there’s no impact on any code currently using the result. What’s the best way of getting the count though? The naive solution is to run each query twice, once to get the count and once to get the results but that seems less than ideal. I think there’s something with caching of queries that may help. Is that how it’s done in the GUI? Any pointers gratefully received and of course I’ll share any code back to the project. Thanks, James

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Parsing options on db:add (cdata-section-elements)
by Tim Thompson 13 Jul '15

13 Jul '15

Hello, I am trying to retrieve some non-XML RDF data (as "text/turtle") from a SPARQL endpoint. I need to output the Turtle as a CDATA section inside a <script> tag in an XForms (X)HTML file, then add that file to a database. The file gets added correctly, but I'm not able to generate the CDATA section. Here is the function: db:add("xforms", document { $xslt-pi, $css, $form }, "turtle-test.xml", map {"cdata-section-elements": "script"}) When I run this, I get an error: [bxerr:BASX0002] Unknown database option 'cdata-section-elements'. I get the same error no matter which option I use (not just "cdata-section-elements"), so I guess I may be using the wrong syntax. Hope someone can point me in the right direction! Thanks in advance, Tim -- Tim A. Thompson Metadata Librarian (Spanish/Portuguese Specialty) Princeton University Library

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Any Way to Create A Database And Commit To It From REST Service?
by Eliot Kimber 13 Jul '15

13 Jul '15

In my link management application I'm trying to refactor my code to move my link management metadata out of the content database (the one that otherwise has the user's XML docs) and into a separate database. The problem I'm running into is that because db:create() is put last on the pending updates list, you can't do return ( db:create('new-database'), db:add('new-database', '<some-data/>')) There doesn't seem to be a direct way through the RESTXQ-managed application to create the database since updating functions don't return anything (so I can't, for example, have the root page handler ensure that the database is there simply by calling an XQuery function to initial it). I think the only solutions are: 1. Have the database creation managed outside the REST application (e.g., in my git hooks, which are where the content database creation is done) 2. Use the redirect technique so that, for example, the root page is handled by an updating function that does the database initialization and then returns a redirect to the real root page handler. Have I missed an option? Thanks, Eliot ---- Eliot Kimber, Owner Contrext, LLC http://contrext.com

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Fwd: Bug?
by Сергей Чесноков 13 Jul '15

13 Jul '15

Hi! What is it?: Unexpected error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.2.2 Java: Oracle Corporation, 1.8.0_45 OS: Windows 7, amd64 Stack Trace: java.lang.ArrayIndexOutOfBoundsException: 1 at org.basex.query.func.admin.AdminWriteLog.item(AdminWriteLog.java:25) at org.basex.query.expr.ParseExpr.value(ParseExpr.java:64) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.List.value(List.java:146) at org.basex.query.expr.TypeCheck.value(TypeCheck.java:127) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.If.value(If.java:133) at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72) at org.basex.query.expr.TypeCheck.value(TypeCheck.java:127) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.If.value(If.java:133) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:192) at org.basex.query.func.FuncCall.invoke(FuncCall.java:87) at org.basex.query.func.FuncCall.value(FuncCall.java:60) at org.basex.query.func.FuncCall.iter(FuncCall.java:66) at org.basex.query.MainModule.iter(MainModule.java:110) at org.basex.query.QueryContext.iter(QueryContext.java:349) at org.basex.http.restxq.RestXqResponse.create(RestXqResponse.java:55) at org.basex.http.restxq.RestXqModule.process(RestXqModule.java:101) at org.basex.http.restxq.RestXqFunction.process(RestXqFunction.java:109) at org.basex.http.restxq.RestXqServlet.run(RestXqServlet.java:44) at org.basex.http.BaseXServlet.service(BaseXServlet.java:64) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494) at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Unknown Source) __________________________________________________________________________________________________________ and: message Unexpected error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.2.2 Java: Oracle Corporation, 1.8.0_45 OS: Windows 7, amd64 Stack Trace: java.lang.ArrayIndexOutOfBoundsException: 1 at org.basex.query.func.admin.AdminWriteLog.item(AdminWriteLog.java:25) at org.basex.query.expr.ParseExpr.value(ParseExpr.java:64) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.List.value(List.java:148) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:192) at org.basex.query.func.FuncCall.invoke(FuncCall.java:87) at org.basex.query.func.FuncCall.value(FuncCall.java:60) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.If.value(If.java:133) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.If.value(If.java:133) at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72) at org.basex.query.expr.TypeCheck.value(TypeCheck.java:127) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.expr.If.value(If.java:133) at org.basex.query.QueryContext.value(QueryContext.java:421) at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:192) at org.basex.query.func.FuncCall.invoke(FuncCall.java:87) at org.basex.query.func.FuncCall.value(FuncCall.java:60) at org.basex.query.func.FuncCall.iter(FuncCall.java:66) at org.basex.query.MainModule.iter(MainModule.java:110) at org.basex.query.QueryContext.iter(QueryContext.java:349) at org.basex.http.restxq.RestXqResponse.create(RestXqResponse.java:55) at org.basex.http.restxq.RestXqModule.process(RestXqModule.java:101) at org.basex.http.restxq.RestXqFunction.process(RestXqFunction.java:109) at org.basex.http.restxq.RestXqServlet.run(RestXqServlet.java:44) at org.basex.http.BaseXServlet.service(BaseXServlet.java:64) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Unknown Source) Sincerely, Sergey Chesnokov. ----------------------------------------------------------------------

2 1

Why is $node/@attr != 'blue' false when $node is null?
by France Baril 10 Jul '15

10 Jul '15

The code below returns 'blue', but I was expecting 'not blue'. The class attribute on an empty node is null; null != blue. let $node := () return if($node/@class != 'blue') then 'not blue' else 'blue' -- France Baril Architecte documentaire / Documentation architect france.baril(a)architextus.com

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BaseX-Talk July 2015