BaseX-Talk

basex-talk@mailman.uni-konstanz.de

12 participants
5242 discussions

anti bug
by Hans-Juergen Rennau 13 Apr '21

13 Apr '21

Hello, I would like to let you know that just as there is matter and anti matter, there are bugs and anti bugs. An anti bug is when something works which cannot possibly work. I am not surprised that the first anti bug detected (by me) is a BaseX one. The following invocation basex "doc('result.xml')/*/page/id => distinct-values() => sort()" processes a file the size of which is more than 8 GB. It cannot be processed on my machine, unless processing is streaming. A streaming fn:doc? Amazing. (At least me.) Hans-Jürgen

2 4

Re: [basex-talk] Multi-platform lightweight C/C++ BaseX client API
by Christian Grün 12 Apr '21

12 Apr '21

A new C++ BaseX Client is available, based on the SDL2_net library [1]. Thanks to Karim Salama for the contribution! [1] https://github.com/bsella/BaseX_CppClient

1 0

MAXLEN
by Beck, Julia 07 Apr '21

07 Apr '21

Dear all, The option MAXLEN tricked me today which is why I need some advice. I have the problem that I have a query that normally works smoothly but with one certain data set, it's really slow. I think it's because at some point in the query I am trying to match a value from the index that is cut due to MAXLEN of 96 (I made a test: the query is fast for values below 96, but 97 and above is slow). So I followed the documentation and created the database again with a MAXLEN of 200 instead. What tricked me was that whenever I optimize the database, MAXLEN is back to 96. The documentation says about MAXLEN: "Specifies the maximum length for strings to be stored in index structures<https://docs.basex.org/wiki/Indexes>. The value of this option will be assigned once to a new database, and can *only be changed* by creating a new database or doing a full optimization<https://docs.basex.org/wiki/Commands#OPTIMIZE>." I assumed "full optimization" means db:optimize with $all is true(). But I noticed that the value of MAXLEN also changes when I do db:optimize without true(). For Optimization, the documentation states: * If ALL is specified, all database structures are completely reconstructed. The database size will be reduced, and all orphaned data will be deleted. * Without ALL, only the outdated index structures and database statistics will be updated. If the database is completely up-to-date, nothing will be done. * Database options will be adopted from the original database. Only AUTOOPTIMIZE<https://docs.basex.org/wiki/Options#AUTOOPTIMIZE> and (if ALL is specified) UPDINDEX<https://docs.basex.org/wiki/Options#UPDINDEX> will be adopted from the current options. If I understand correctly from the last bullet point, it says that the MAXLEN option is not considered from the original database as it's an index option. For the second bullet point I would not say though, that "nothing will be done", if the database is completely up-to-date. Because when I create a new database "test" with a MAXLEN of 200 and do a db:optimize("test"), MAXLEN goes back to 96. How to keep MAXLEN at the value I set? Do I have to set it every time, I do an optimization? Like db:optimize("test", map {"maxlen": 200})? That seems to work but it feels a bit over the top, considering that I have many queries with optimizations that I would need to adapt for this one data set then. What is the reason for resetting MAXLEN during optimization? Best wishes, Julia

3 3

BaseX 9.4.2: Tweaks & Fixes
by Christian Grün 02 Apr '21

02 Apr '21

Dear all, We have released another 9.4 late-summer maintenance release with new performance tweaks and minor bug fixes: http://basex.org In addition, we have started a new Wiki article on XQuery optimizations, which we plan to extend step by step: https://docs.basex.org/wiki/XQuery_Optimizations We are looking forward to your feedback; have fun, Your BaseX Team

2 7

A question about the arrow operator and predicates
by Bridger Dyson-Smith 31 Mar '21

31 Mar '21

Hi all - I was wondering if anyone would have an insight for me as to why the following expression is wrong: ``` for $s in ("/a/b/c", "/1/2/3") let $t := $s => tokenize("/")[last()] return $t ``` This is because of the predicate filter, but I'm not clear on *why* it's because of that :) Thanks for your help! Best, Bridger PS I don't always remember to look at the optimized query in the Info window, but when I do I always get a hint about something; "util:last()" in this case. correctly ``` for $s in ("/a/b/c", "/1/2/3") let $t := tokenize($s, "/")[last()] return $t ``` ``` for $s in ("/a/b/c", "/1/2/3") let $t := $s => tokenize("/") => util:last() return $t ```

2 3

Missing namespaces when storing an excerpt?
by Clark, Ash 29 Mar '21

29 Mar '21

Hi! I’m pulling JSON from an API, converting the string to the XML representation, and storing part of the resulting XML into BaseX. The problem is, I can’t get the xmlns namespace declaration to stick to the XML excerpt once it’s saved to BaseX. It seems to work when I display the unstored excerpt. Here’s a short XQuery that illustrates my problem. Am I missing something? Is this a bug? xquery version "3.1"; (: NAMESPACES :) declare default element namespace "http://www.w3.org/2005/xpath-functions"; declare namespace db="http://basex.org/modules/db"; declare namespace output="http://www.w3.org/2010/xslt-xquery-serialization"; declare namespace update="http://basex.org/modules/update"; (: OPTIONS :) declare option db:chop 'false'; declare option db:stripns 'false'; declare option output:indent 'yes'; declare option output:method 'xml'; (: MAIN QUERY :) let $uri := "https://wwp.northeastern.edu/exist/rest/db/exhibits/xquery/people.xquery?fi…" let $full := json-to-xml(unparsed-text($uri)) let $snippet := $full/fn:array/fn:map[1] let $workaround := <map xmlns="http://www.w3.org/2005/xpath-functions">{ $snippet/* }</map> return ( db:create("test-ns", ($full, $snippet, $workaround), ("full.xml", "snippet.xml", "workaround.xml")), update:output(($snippet, $workaround)) ) Thanks for your time! Warmly, Ash Ash Clark (my pronoun.is/e/em/eir<http://pronoun.is/e/em/eir>) XML Applications Developer Digital Scholarship Group Northeastern University Libraries as.clark(a)northeastern.edu (617) 373-5983

2 6

Question about JSON parsing/serializing
by Hans-Juergen Rennau 22 Mar '21

22 Mar '21

Dear BaseX team, there is something I don't understand about the parsing/serializing of JSON. When I serialize a document without options, backslashes are escaped. So for example ... <url>https://help.openconnectors.ext.hana.ondemand.com/home/google-analytics</url> becomes"url":"https:\/\/help.openconnectors.ext.hana.ondemand.com\/home\/google-analytics" Only using serialization options - map{"escape": "no"} - do I get the output as expected, corresponding to the input. Why are slashes by default escaped when serializing JSON? Kind regards,Hans-Jürgen PS: When parsing, the slashes are not escaped, so it is "asymmetrical" - I need to parse without options, yet to serialize with options.

4 12

Re: [basex-talk] Call for install/setup stories from users
by Graydon 17 Mar '21

17 Mar '21

On Wed, Mar 17, 2021 at 10:43:07PM +0100, Ben Engbers scripsit: > To my knowledge there is no need to remove the data directory. I have never > done this and have never had any problems Well, data/ is in the archive empty and I need to retain the existing data from the incumbent basex when I update BaseX. I find it's simpler to promote data/ to being a sibling of basex/ and use a symbolic link from inside basex/ to find it so I don't have to argue with the defaults. (I am far from sure you can argue with the defaults to the extent of putting the data directory outside of basex/.) So, if you have no need to retain data = no need to do anything with data/. But if you do need to retain data/, giving whatever archive tool a chance to drop an empty data/ over it on upgrade is maybe not the best plan. -- Graydon Saunders | graydonish(a)gmail.com Þæs oferéode, ðisses swá mæg. -- Deor ("That passed, so may this.")

1 0

Preferences do not open, Exception in thread AWT-EventQueue-0
by commandline-be 17 Mar '21

17 Mar '21

Hey, To split off this bug report from the 'first post on this mailinglist' thread. Noteworthy but probably not relevant is every time is start basexgui i see [warning] /usr/bin/basexgui: Unable to locate /usr/share/java/tagsoup.jar in /usr/share/java [warning] /usr/bin/basexgui: Unable to locate /usr/share/java/jline.jar in /usr/share/java This is the output i see in the terminal when running the command basexgui and selecting Preferences in the window. This repeats every time i select Preferences. Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 3, Tab count: 3 at java.desktop/javax.swing.JTabbedPane.checkIndex(JTabbedPane.java:1758) at java.desktop/javax.swing.JTabbedPane.setSelectedIndex(JTabbedPane.java:595) at org.basex.gui.dialog.DialogPrefs.<init>(DialogPrefs.java:44) at org.basex.gui.dialog.DialogPrefs.show(DialogPrefs.java:56) at org.basex.gui.GUIMenuCmd$50.execute(GUIMenuCmd.java:778) at org.basex.gui.GUIMenu.lambda$newItem$0(GUIMenu.java:77) at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) at java.desktop/javax.swing.AbstractButton.doClick(AbstractButton.java:369) at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1020) at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1064) at java.desktop/java.awt.Component.processMouseEvent(Component.java:6635) at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342) at java.desktop/java.awt.Component.processEvent(Component.java:6400) at java.desktop/java.awt.Container.processEvent(Container.java:2263) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5011) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4843) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4843) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90) Best, Joris- - - mailto:commandline@protonmail.com

6 16

first post on this mailinglist
by commandline-be 17 Mar '21

17 Mar '21

Dear, With a need to dig into ms eventlog converted to xml i landed with BaseX and was amazed by the functionality presented with this tool. I'm new to many things here so i'm going thru a learning curve here. This mail is mostly to propose improvement and feature requests, some minor other may be more elaborate * Map visualisation : a mode in which the keys are listed in hierarchical yet isometric way so they are not abreviated but listed for visual acessibility. * Forms builder : a simple form builder to datamine xml files would be nice, for my current purpose i'm to write a number of queries to identify specific eventid, attributes and values in relation to one another, being able to simply select a query in a drop down would be nice to review results etc * Possible bug : the preferences dialog no longer shows up * upgrade path : working with a linux distro prohibits simple upgrading, an upgrade dialog for drop in out of band upgrades could prove welcome to not flood this mailing list old bugs Thank you, Joris

2 3

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

BaseX-Talk