BaseX-Talk April 2018

basex-talk@mailman.uni-konstanz.de

26 participants
42 discussions

Global locks
by Andy Bunce 11 Feb '19

11 Feb '19

Running the following in the GUI (8.6.5) ``` let $db:="BEP" return count(collection($db)) ``` The info windows shows $db is inlined Compiling: - inline $db_0 - pre-evaluate collection("BEP") to document-node() sequence - pre-evaluate count((db:open-pre("BEP",0), ...)) to xs:integer - simplify gflwor Optimized Query: 9193 All good. Submitting a job ``` let $q:='let $db:="BEP" return count(collection($db))' return jobs:eval($q,(),map{"cache":true()})!(jobs:wait(.),jobs:list-details(.)) ``` returns: <job id="job90" type="ScheduledXQuery" state="cached" user="admin" duration="PT0.007S" reads="(global)" writes="(none)">let $db:="BEP" return count(collection($db))</job> Note @reads="(global)" But ``` let $q:='count(collection("BEP"))' return jobs:eval($q,(),map{"cache":true()})!(jobs:wait(.),jobs:list-details(.)) ``` <job id="job92" type="ScheduledXQuery" state="cached" user="admin" duration="PT0.006S" reads="BEP" writes="(none)">count(collection("BEP"))</job> Note @reads="BEP" Is this correct and/or of any consequence? /Andy

2 8

BaseX 9.0: The Spring Edition!
by Christian Grün 01 Nov '18

01 Nov '18

Dear BaseX aficionados, We are very happy to announce the release of BaseX 9.0! The new version of our XML database system and XQuery 3.1 processor includes some great new features and a vast number of minor improvements and optimizations. It’s both the usage of BaseX in productive environments as well as the valuable feedback of our open source users that make BaseX better and better, and that allow and motivate us to keep going. Thanks to all of you! Along with the new release, we invite you to visit our relaunched homepage: http://basex.org/. Java 8 is now required to run BaseX. The most prominent features of Version 9.0 are: XQUERY - Comprehensive extensions in the internal XQuery optimizer framework - Dynamic hash joins rewritings of general comparisons - Register query jobs as persistent services - Process very large CSV files via the new CSV 'xquery' format - Update Module: higher-order functions for performing updates - Unified static typing, including maps, arrays and function items - COPYNODE: Lightweight copying of XML fragments - ENFORCEINDEX: Enforce rewriting for index access STORAGE - Improved database compression (short strings, whitespaces) WEB APPLICATIONS - Permissions layer: Unified definition of RESTXQ access patterns - RESTXQ: Full support for client- and server-side quality factors - REST: Run BaseX command scripts - Web server upgrade to Jetty 9 REPOSITORIES - Combined packaging mechanism (XQuery and Java) - Java Packaging: Bundling of additional libraries DISTRIBUTIONS - Revised detection and configuration of BaseX home directory - Windows executable: better detection of Java libraries DBA: BASEX DATABASE ADMINISTRATION - Improved editing and evaluation of XQuery modules - Revised file, session and job management More details can be found on our homepage. We are looking forward to your feedback. Enjoy and have fun, Christian, BaseX Team

7 8

Unlock database
by Ben Engbers 30 Apr '18

30 Apr '18

Hi, Somehow, I managed to lock a (test)-database and now I can't get it unlocked. Is it possible to manually remove the lock? If so, how? Cheers, Ben Engbers

2 1

BaseX 9.0.1 and validate:xsd-info
by France Baril 30 Apr '18

30 Apr '18

Hi, This used to work, but it doesn't anymore. Setup: Create a db called AppResources and put any xsd in it with the root id set to 'schema-test-validate'. .xq: Expected result: validation error. Result I get: Stopped at *path*/xsd-validate-test.xq, 6/30: [FODC0002] Resource 'test-to-delete.xsd' does not exist. I checked, the xsd does exist on my file system. I also validated content against it. The .xsd works, it does validate content outside of baseX. Can you help? Thanks! -- France Baril Architecte documentaire / Documentation architect france.baril(a)architextus.com

2 3

Variable prefixing, modules and RESTXQ
by Andreas Mixich 28 Apr '18

28 Apr '18

Hello, writing a RESTXQ application, I have the following code in a module: module namespace page = 'http://localhost/web-page'; declare %rest:path("/list/{$category}") %rest:GET %rest:query-param("page:category", "{$category}") %output:method("xhtml") %output:omit-xml-declaration("no") %output:doctype-public("-//W3C//DTD XHTML 1.0 Transitional//EN") %output:doctype-system("http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd") function page:list($page:category as xs:string) { () }; I get: [basex:restxq] Variable $category is not specified as argument. If I replace *every* '$category' with '$page:category' I get: [basex:restxq] Variable $page:category is specified more than once. But the only place I use '$page:category' in this module is at this point. The rules are, as far as I have understood: 1. In a module, only one namespace can be used for the functions and variables defined therein, foreign namespaces can be sourced via module imports only. 2. This namespace can not be in the {http://www.w3.org/2005/xquery-local-functions} namespace, but must go into my own namespace, here {http://localhost/web-page}. 3. All variables must be in the relevant namespaces *(global or local only?)*. I now have tried several approaches. As I see in the XQM modules in the BaseX DBA application, it seems, that neither the '%rest:query-param' is needed nor is it needed to prefix variable/parameter names, that are local to that function. This can be found, for example, in 'dba/common.xqm': module namespace dba = 'dba/common'; (:~ : Shows a "page not found" error. : @param $path path to unknown page : @return page :) declare %rest:path("/dba/{$path}") %output:method("html") function dba:unknown( $path as xs:string ) as element(html) { html:wrap( <tr> <td> <h2>Page not found:</h2> <ul> <li>Page: dba/{ $path }</li> <li>Method: { Request:method() }</li> </ul> </td> </tr> ) }; So, I am disturbed by now. What am I doing wrong here? -- Goody Bye, Minden jót, Mit freundlichen Grüßen, Andreas Mixich

2 3

Adding local declarations in a module?
by Andreas Mixich 27 Apr '18

27 Apr '18

Hello, in a module, consisting of many function declarations, how can I configure a single function to `declare copy-namespaces="no-preserve, no-inherit";` ? Thanks. -- Goody Bye, Minden jót, Mit freundlichen Grüßen, Andreas Mixich

1 0

BaseX on Docker
by Rolf Kleef 25 Apr '18

25 Apr '18

Hi, Thanks for version 9! I am trying to get things running in docker container, and see in the github issues there have been a few changes such as the directories BaseX uses [1] which are not reflected in the README yet. If you like I can put a few things in a pull request while I figure things out here :-) ~~Rolf. [1] https://github.com/BaseXdb/basex/issues/1546

2 1

Missing 'DELETE' in server protocol?
by Ben Engbers 25 Apr '18

25 Apr '18

Hi, It was only after starting to implement my R-client implementation in examples, that I noticed there is no 'DELETE'-command specified in the server protocol. Is this a deliberate ommission? I would guess that implementing such a command would come down to something like this: delete = function(name = name) { writeBin(as.raw(---BYTE---), private$sock) writeBin(private$raw_terminated_string(name), private$sock) return(list(info = private$info, success = self$bool_test_sock())) } If this is correct, where can I find (a list with) the required byte-codes? Ben Engbers

2 5

BaseX Result pane wrap/unwrap option
by Yitzhak Khabinsky 24 Apr '18

24 Apr '18

Hello, I am running a XSLT transformation which is producing a wide textual output. <xsl:output method="text" /> Its output is 300 plus characters wide. It seems that the BaseX Result pane doesn't have a wrap/unwrap option. Is it possible to introduce such functionality to the BaseX Result pane? [cid:image001.png@01D3DBD4.8C176710] Regards, Yitzhak Khabinsky Technical Services Lead Millicom International Services LLC 396 Alhambra Circle, Suite 1100 Coral Gables, FL 33134 Skype4B: +1 (305) 445-4172 Tel: (954) 684-8673 yitzhak.khabinsky(a)millicom.com<mailto:.khabinsky@millicom.com> www.millicom.com<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.millico…>

2 1

BaseX 9.0.1: Bug Fixes, Improvements
by Christian Grün 24 Apr '18

24 Apr '18

Dear all, Welcome to our first BaseX 9.01 maintenance release: http://basex.org/ An update is highly recommended: The major release had a critical bug, regarding the storage of short non-ASCII Unicode strings. This is the 9.0.1 changelog: CRITICAL BUG FIXES * Storage: short strings with extended Unicode characters fixed * XQuery: nested path optimizations reenabled (e.g. in functions) * XQuery: map:merge, size computation fixed * XQuery: node ordering across multiple database instances fixed IMPROVEMENTS * GUI: Better Java 9 support (DPI scaling, font rendering) * XQuery, collections: faster document root tests * New R client. Thanks Ben Engbers! * Linux: exec command used in startup scripts MINOR BUG FIXES * XQuery: Allow interruption of tail-call function calls * XQuery, HTTP parsing of content-type parameters * XQuery, restrict rewriting of filter to path expression * GUI: progress feedback when creating databases via double-click Have fun everyone, Christian

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BaseX-Talk April 2018