BaseX-Talk June 2022

basex-talk@mailman.uni-konstanz.de

26 participants
24 discussions

BaseX 9.6: The Summer Edition
by Christian Grün 28 Nov '24

28 Nov '24

Dear all, We provide you with a new and fresh version of BaseX, our open source XML framework, database system and XQuery 3.1 processor: https://basex.org/ Apart from our main focus (query rewritings and optimizations), we have added the following enhancements: XQUERY: MODULES, FEATURES - Archive Module, archive:write: stream large archives to file - SQL Module: support for more SQL types - Full-Text Module, ft:thesaurus: perform Thesaurus queries - Fulltext, fuzzy search: specify Levenshtein limit - UNROLLLIMIT option: control limit for unrolling loops XQUERY: JAVA BINDINGS - Java objects of unknown type are wrapped into function items - results of constructor calls are returned as function items - the standard package "java.lang." has become optional - array arguments can be specified with the middle dot notation - conversion can be controlled with the WRAPJAVA option - better support for XQuery arrays and maps WEB APPLICATIONS - RESTXQ: Server-Timing HTTP headers are attached to the response For a more comprehensive list of added and updated features, look into our documentation (docs.basex.org) and check out the GitHub issues (github.com/BaseXdb/basex/issues). Have fun, Your BaseX Team

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recursively used variables
by Rob Stapper 12 Aug '24

12 Aug '24

Hi, The code[1] below and send as attachment generates a error message: “Static variable depends on itself: $Q{http://www.w3.org/2005/xquery-local-functions}test”. I use these variables to refer to my private functions in my modules so I can easyly refer to them in a inheritance situation. It’s not a big problem for me but I was wondering if the error-triggering is justified or that it should work. [1]=========================================== declare variable $local:test := local:test#1 ; declare %private function local:test( $i) { if ( $i > 0) then $local:test( $i - 1) } ; $local:test( 10) =========================================== Kind regards, Rob Stapper Sent from Mail for Windows 10 -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

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xslt:transform-report result
by Andy Bunce 11 Mar '24

11 Mar '24

Hi, Using BaseX 9.7.1 and saxon9he-9.9.1.jar The documentation suggests the ?result from xslt:transform-report should be *a* document-node where possible [1] This seems not quite to be the case when there are processing instructions or comments at the top level. In these cases a sequence of document-nodes is returned. /Andy [1] https://docs.basex.org/wiki/XSLT_Module#xslt:transform-report let $xslt:=<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="3.0"> <xsl:mode on-no-match="shallow-copy"/> </xsl:stylesheet> let $xml:=document{ <?something type="compact"?>, <foo/>} return xslt:transform-report($xml,$xslt) Returns map { "messages": (), "result": (<?something type="compact"?>, <foo/>) }

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First steps with client/server on Linux - bulk import; error message in dba
by Florian Schmitt 18 Jul '22

18 Jul '22

Hi all, i'm currently evaluating BaseX running on a headless Linux Server. It took me quite a while to get it running (the docs seem to be focused on Windows environments)... Is there a way to contribute to the documentation? First question: After importing some of documents nicely organized in collections, i've found that the REST client will display all documents on the same "level" instead of showing just the first level of collections. This isn't nice if the db contains a great number of documents.... When accessing the same db using WebDAV (Oxygen), one can nicelly navigate using the collection structure. With REST, adding the collection names to the URL will restrict the output to the db content of those collections. But without such a restriction, it would be great if the REST web interface would just return the first level of collections without any XML resource entries. Second question: What's the "best practice" for bulk imports while retaining the directory structure of the imported files using collections? I've found that Oxygen "translates" subdirectories into collections when using the "import directories" feature. Is there somehing similar using the command line client? And another issue: The "Logs" page of the DBA webapp shows the following error warning: "Unexpected error: Improper use? Potential bug? Your feedback is welcome: Contact..." Is this a critical error? How to debug this? So far, i'found the wrapper-basex log, but it doesn't contain anything useful. Since i'm using the Yajsw Wrapper, there's no debug output or debug option (?). Yours sincerely. Florian

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the implicit context of position
by Graydon Saunders 30 Jun '22

30 Jun '22

Hello -- I've got an element node that's part of a document. I need its position among the element children of its parent. $step/position() will (correctly!) always return 1, there's one thing in $step, of course it does. replace($step/path(),'^.*\[(\p{Nd}+)\]$','$1') => xs:integer() gets me the implicit position but is something of a horror. for $e at $in in $step/../* where $e is $step return $in works, too, but any notion of elegance and clarity have fled screaming into the night. I keep thinking there must be a better way; anyone got any suggestions? Thanks! Graydon

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Sym links in BaseX 9.7.2
by Maud Ingarao 30 Jun '22

30 Jun '22

Hi everybody ! As we had problems getting our formatDateTime() outputs in french, we followed Christian's advice and updated to BaseX 9.7.2. Now it works and we get our outputs in French, thanks a lot ! But we face a new problem : symbolic links inside the webapp are no longer followed. We tried to had the following to jetty.xml : | <Call name="addAliasCheck"> <Arg><New class="org.eclipse.jetty.server.handler.AllowSymLinkAliasChecker"/></Arg> </Call> | But this doesn't seem to be the answer. I can't remember configuring anything in particular in the previous versions of BaseX and our webapp was just running fine. Thanks for your help. Maud || -- Maud Ingarao IHRIM - UMR 5317 Institut d’histoire des représentations et des idées dans les modernités École Normale Supérieure de Lyon 15 Parvis René Descartes - BP7000 - 69342 Lyon CEDEX 07 +33 4 37 37 65 79 - maud.ingarao(a)ens-lyon.fr */Présente les lundi - mardi - mercredi/* */At the office on mondays - tuesdays - wednesdays/* http://ihrim.ens-lyon.fr/ http://ahn.ens-lyon.fr/ https://cahier.hypotheses.org/

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How To Determine if You're In Daylight Saving Time?
by Eliot Kimber 28 Jun '22

28 Jun '22

I’m showing times on RESTXQ generated pages that need to be adjusted for a particular time zone. Doing the time zone adjustment is easy enough but I realized that knowing whether or not a given time zone should be standard or daylight time is a challenge not directly addressed by the XQuery time functions. So my question: does anyone have a technique for determining if a given time zone or region is using DST? Of course I can hard-code some sort of DST calendar for the time zones I know I need (U.S. time zones, European Central Time, India Standard Time) but it seemed like there ought to be a more general solution somewhere. My server is running on Linux but is developed and tested on macOS. Thanks, Eliot _____________________________________________ Eliot Kimber Sr Staff Content Engineer O: 512 554 9368 M: 512 554 9368 servicenow.com<https://www.servicenow.com> LinkedIn<https://www.linkedin.com/company/servicenow> | Twitter<https://twitter.com/servicenow> | YouTube<https://www.youtube.com/user/servicenowinc> | Facebook<https://www.facebook.com/servicenow>

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Fonts problem with database list and system dialogs
by Jonathan Robie 28 Jun '22

28 Jun '22

I can't read the names of databases in my UI now - the font is tiny. And the systems dialogs I might otherwise be able to use to find and fix the problem also use tiny fonts. Other windows are fine. [image: image.png] Jonathan

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XPATH injection / escaping
by trichel 26 Jun '22

26 Jun '22

Hello, How to write secure queries when the queried text nodes contain ampersands? For instance: declare variable $publisher external; (: $pub == 'Faber & Faber' :) declare variable $db := db:open('db'); let $records := $db/record/publisher[. = $publisher] (: publisher == 'Faber & Faber' :) The external variable is unsafe input, escaped by the sending application. Escaping the ampersand in the external variable with & (& a m p ;) doesn't work, Basex stops finding hits. Just letting the ampersand pass might expose the code to injection attacks? I could switch to a full-text query and remove the ampersand from the external variable, but that's a bit hackish. The expression is exact. How to proceed in a secure way?

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Link Graph Construction: Anything I Can Crib or Learn From?
by Eliot Kimber 26 Jun '22

26 Jun '22

In the context of our Project Mirabel system that manages DITA content, I need to be able answer the question “for topic X, what other topics link to it directly or indirectly?” That is, say Topic A links to Topic B that Links to Topic C. Asking the question “What topics ultimately link to topic C?” I would like to get the answer “Topic A, Topic B”. Getting the answer for direct references is easy—I already build a where-used index that captures, for each DITA map or topic, what other maps and topics link directly to it. But to get the Topic A part of the answer I need some kind of link graph index and I’m not sure how best to go about calculating this or capturing it in some index or set of indexes. In our content the fan out from a single Topic C to the set of topics that ultimately reference it could be 10s of 1000s of topics. We have about 45K topics in the content for each version of the ServiceNow Platform and a number of topics that are used by a large number of other topics, so the explosion can be quite large. That suggests that a simple topic-to-ultimately-referenced-topics index would be very inefficient in that the entry for any given topic could potentially have 45K – 1 entries (we don’t care that a topic references itself). On the other hand, working backwards through chains of direct references can also be expensive and is probably too slow, so maybe the brute-force index is the best option? At the same time, I would like to be able to quickly visualize the link graph extending from or ending in any given topic or simply the link graph for the entire information set, which requires capturing the nodes and edges. My question: does anyone either have experience or insight into this kind of link graph challenge or know of relevant papers or general discussion of graph processing I might look at? Thanks, Eliot _____________________________________________ Eliot Kimber Sr Staff Content Engineer O: 512 554 9368 M: 512 554 9368 servicenow.com<https://www.servicenow.com> LinkedIn<https://www.linkedin.com/company/servicenow> | Twitter<https://twitter.com/servicenow> | YouTube<https://www.youtube.com/user/servicenowinc> | Facebook<https://www.facebook.com/servicenow>

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BaseX-Talk June 2022