BaseX-Talk May 2023

basex-talk@mailman.uni-konstanz.de

7 participants
9 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

11 43

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/>) }

3 7

PHP Client Session Object: infinite loop in read method when bpos is null
by Tamara Marnell 13 Jul '23

13 Jul '23

Hello everyone, Once in a while, my server running BaseX will suddenly experience a big spike in write operations, the hard disk space will fill up to 100%, and the whole server will lock up. I can't say what initiates this, because the logs and metrics disprove every theory I can think of. (There's nothing unusual in the access logs or BaseX data logs, memory usage stays consistently at 45% and CPU usage at 5%, no user attempted anything like a huge bulk upload, etc.) However, one thing that always happens during these incidents is that the Apache error log blows up to a crazy size like 1 GB, filled with the message: PHP Notice: Trying to access array offset on value of type null in /[path]/client/session.php on line 164 This line is in the read method of the Session class from GitHub, and it indicates that the byte position passed to the buffer property is null. My error log probably fills up because read() is called by readString() in a while loop that never terminates. There might be extraordinary circumstances in which during construction, socket_connect returns "true" but the response is not valid or expected. -Tamara -- Tamara Marnell Program Manager, Systems Orbis Cascade Alliance (orbiscascade.org <https://www.orbiscascade.org/>) Pronouns: she/her/hers

2 5

Minor GUI irritation
by Andy Bunce 19 Jun '23

19 Jun '23

Hi, In the GUI when viewing an open database with many namespaces via database -> properties->information. The properties window is excessively tall, often larger than the screen height. There seems to be extra blank space below the "Resource Properties" section and perhaps the namespaces section that could have a scroll bar if required. db:create("nstest",(1 to 60)!``[<foo xmlns="ns`{.}`" />]``,(1 to 60)!(. || ".xml")) Creates a database that shows the behavior on my screen. Seen with BaseXGUI 10.6 on windows, but I think I also saw it with v9. Regards /Andy [image: image.png]

2 2

Empty namespace declarations
by Johannes Bauer 23 May '23

23 May '23

Hi, we've recently updated BaseX from 10.5 to 10.6 and it seems there was some change in the namespace declaration behavior. Example: declare function local:list() as element()+ { ( <string>1</string>, <string>2</string>, <string>3</string> ) }; declare function local:to-json() as element() { <map xmlns="http://www.w3.org/2005/xpath-functions"> <string key="id">id</string> <array key="list">{local:list()}</array> </map> }; local:to-json() Output 10.5: <map xmlns="http://www.w3.org/2005/xpath-functions"> <string key="id">id</string> <array key="list"> <string>1</string> <string>2</string> <string>3</string> </array> </map> Output 10.6: <map xmlns="http://www.w3.org/2005/xpath-functions"> <string key="id">id</string> <array key="list"> <string xmlns="">1</string> <string xmlns="">2</string> <string xmlns="">3</string> </array> </map> The empty namespace attributes are added when the elements are created with a function and not directly in the context of the parent element. Was this intended and if yes is there a switch to get the old behavior back? Best Regards Johannes

2 1

Counterintuitive behavior with cast to double
by Shuxin Li 23 May '23

23 May '23

Hi, I'm Shuxin. Recently I came across this test case in which BaseX returned counterintuitive result. From my feelings it seems like a bug but the behavior of Saxon is similar, and therefore is hard for me to confirm. Give XML document <P1 id="1"><A1 id="2">1</A1><A1 id="3">1</A1>1</P1> and XPath query //*[boolean(.) cast as xs:double] Both Saxon and BaseX return the result node set [1, 2]. However, the nodes with id 2 and 3 seems identical to me and is hard to understand why node 2 is selected while 3 is not. If node 2 is deleted from the XML document, result set [1,3] is returned. I'm interested in whether this is intended behavior which I might have limited knowledge of? If it is also of interest for you you may have a look. Thank you very much! Best Regards, Shuxin Li 2023.5.23

3 2

"Invalid byte 1 of 1-byte UTF-8 sequence." error occurred
by 이창우 22 May '23

22 May '23

Hello? I've been testing BaseX for data backup in a Linux environment for a few months. (Some of the contents are in Japanese.) While using it a while ago, suddenly "Invalid byte 1 of 1-byte UTF-8 sequence." An error has occurred. The content of the file used was fine and was the same as before. I opened this file in VI editor and simply saved and exited. And when I ran the program again, it worked normally. - This file is a compressed xml file in gz format. - The program reads this file, takes the necessary parts, and saves them by passing them to BaseX through the PUT Method. - In this part, "Invalid byte 1 of 1-byte UTF-8 sequence." has occurred. This has been happening for a few hours and I haven't taken any action, but now it's working fine. Is there a part that uses BaseX and can explain why this is happening? Or is it a program problem? Can this problem occur using BaseX? Or is it a problem with the program or the environment? I think it's an encoding problem, but I don't know the exact cause. - The program is made in Java. - Some of the contents of reading and transmitting data are as follows. URL url = new URL(urlTemp); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("PUT"); conn.setRequestProperty("Content-Type", "application/xml"); OutputStream out = conn.getOutputStream(); InputStream in = null; in = new GZIPInputStream(new FileInputStream(filePath)); int len = 0; byte[] readBuffer = new byte[1024]; while ((len = in.read(readBuffer)) > 0) { out.write(readBuffer, 0, len); }

2 1

xquery:eval() - handling of &
by Andrew Sales 11 May '23

11 May '23

Hello, The query xquery:eval( 'contains(.,"&")', map{'':<foo><&></foo>} ) results in: [XPST0003] Invalid entity: '&")...'. I can get the expected result if I double-escape the entity: 'contains(.,"&amp;")' or wrap in a call to serialize: serialize('contains(.,"&")') However, both xquery:eval( 'contains(.,"<")', map{'':<foo><&></foo>} ) and xquery:eval( 'contains(.,">")', map{'':<foo><&></foo>} ) return true, as expected. Is this a bug, or am I missing something? Thanks, Andrew

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BaseX-Talk May 2023