March 2020 - BaseX-Talk - mailman.uni-konstanz.de

Options for ft:search
by Sebastian Zimmer 15 Mar '21

15 Mar '21

Hi, I'd like to request a feature concerning the ft:search method: An `lserror` option that works exactly like the global option `LSERROR`. It would be nice if we could set the maximum Levenshtein distance specifically for each fuzzy search without having to adjust the global option. Another question on ft:search: Is there a reason why it doesn't have a `case` option just like ft:contains has one? Best regards, Sebastian

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Feature Request: Save untitled, open scripts when exiting GUI
by Andreas Mixich 30 Jul '20

30 Jul '20

SublimeText has this nifty feature, that it saves all open tabs, even if the have no representation on the filesystem, so one can continue exactly, where one has left off. I find myself often to have several, unnamed, XQueries open, to test this concept, to compose that function, etc. It would be nice, if one could simply shut off and have them reopened next time without naming a file and saving each item in question. -- Minden jót, all the best, Alles Gute, Andreas Mixich

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Memoize
by Mickael Desfrenes 25 Jul '20

25 Jul '20

Hello dear basex list, Is there any known solution for function memoization in basex ? Or maybe a cache implementation ? M. Desfrênes

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BaseX 9.3.2: Performance Tweaks, Bug Fixes
by Christian Grün 15 May '20

15 May '20

Dear all, We are glad to provide you with a new BaseX 9.3.2 maintenance release: http://basex.org In preparation to version 9.4, we have introduced numerous small query optimizations that speed up path, predicate and simple map operations and will rewrite your queries for index access more often than before. Feel free to check out the full list of added rewritings and enhancements on Github: https://github.com/BaseXdb/basex/issues?q=is%3Aissue+is%3Aclosed Have fun with the new release, Christian BaseX Team

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9.2.1 not found in maven central
by andreas.hengsbach＠nexoma.de 07 May '20

07 May '20

Hi, is there a reason, that I can't find the current Version (9.2.1) in maven central? Thanks and best regards, Andreas

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Use of function-lookup in REST-XQ environment
by Mauro Mugnaini 04 May '20

04 May '20

Hi all, In order to have a "dynamic backend” implementation to REST-XQ invocations we used the fn:function-lookup() function but we are experiencing a strange behavior if the target looked-up function is an updating function that for example adds a resource to a database. Putting the provided files in the webapp folder of a fresh new BaseX latest (9.3.2) downloaded instance (adding "MIXUPDATES = true” setting in the .basex and with a database named DB already created inside) and invoking the REST function that calls directly the backend function with [1] the resource is correctly created on the database, by invoking the REST function that performs the dynamic lookup by using the fn:function-lookup() with [2] it completes without errors but the resource is not added to the DB. In our implementation the implementation modules are stored in the repo but the same behavior can be reproduced with “direct” function call as per my example. Is there any limitation in the looked-up function related to updating databases? Regards, Mauro [1] http:send-request( <http:request method="POST"> <http:body media-type="application/xml"/> </http:request>, "http://localhost:8984/store", <joe/> ) [2] http:send-request( <http:request method="POST"> <http:body media-type="application/xml"/> </http:request>, "http://localhost:8984/dyn-store", <joe/> )

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Re: [basex-talk] How to apply array:for-each on an array of arrays?
by Martin Honnen 31 Mar '20

31 Mar '20

On 31.03.2020 18:32, Ben Engbers wrote: > Hi, > > For (my personal) clarity, I have split up the original function in two > parts: > > declare function local:step_one($nodes as node()*) as array(*)* > { > let $text := for $node in $nodes > return $node/text() => > tokenize() => distinct-values() > let $idf := $text => > tidyTM:wordCount_arr() > return $idf > }; > > In local:step_one(), I first create a sequence with the distinct tokens > for each $node. All the sequences are joined in $text. > I then call wordCount_arr to count the occurences of each word in $text: > > declare function tidyTM:wordCount_arr( > $Words as xs:string*) > as array(*) { > for $w in $Words > let $f := $w > group by $f > order by count($w) descending > return ([$f, count($w)]) > } ; > > I would say that tidyTM:wordCount_arr returns a sequence of arrays but I > am not certain if I have specified the correct return-type? Reading the code I agree that the return type seems to be a sequence of arrays but therefore I wonder why you don't get a similar error as later on with declaring array(*) and not array(*)* > Calling local:step_one(tidyTM:remove_Stopwords($nodes, "Stp", $Stoppers)) > returns: > ["probleem", 703] > ["opgelost.", 248] > .... > > I had hoped that calling the following local:wordFreq, would add the > idf to each element but instead I get an error > > declare function local:wordFreq_idf($nodes as node()*) as array(*) > { > let $count := count($nodes) > let $idf := local:step_one($nodes) > let $result := for-each( $idf, > function($z) {array:append ($z, math:log($count div $z(2) ) ) } ) > return $result > }; > [XPTY0004] Cannot promote (array(xs:anyAtomicType))+ to array(*): $idf > := ([ "probleem", 703 ], [ "opgelost.", 248 ], ...). The message tries to tell you that the declared return type array(*) is a single array while the function returns a (non-empty) sequence of arrays so using declare function local:wordFreq_idf($nodes as node()*) as array(*)* would remove that error. To insert the third value into each array I think you want let $result := $idf ! array:append(., math:log($count div .(2) ))

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How to apply array:for-each on an array of arrays?
by Ben Engbers 31 Mar '20

31 Mar '20

Hi, In textmining, the 'idf' or inverse document frequency is defined as idf(term)=ln(ndocuments / ndocuments containing term). I am working on a function that should return this idf. This function: declare function local:wordFreq_idf($nodes as node()*) as array(*) { let $count := count($nodes) let $text := for $node in $nodes return $node/text() => tokenize() => distinct-values() let $idf := $text => tidyTM:wordCount_arr() return $idf }; returns: ["probleem", 703] ["opgelost.", 248] ["dictu", 235] ["opgelost", 217] ["medewerker", 193] ... For "probleem", the idf should be calculated as ln($count/703). Since there are 1780 nodes this would result in 0.929011751. I tried to exten the 'let $idf' line with: => array:for-each(function($idf) {array:append($idf, math:log($count div $idf[2]) )}) which should result in ["probleem", 703, 0.929011751] but no mather what I do, every time I get this error: [XPTY0004] Cannot promote (array(xs:anyAtomicType))+ to array(*): ([ "probleem", 703 ], [ "opgelost.", 248 ], ...). Is it possible to apply array:for-each on an array of arrays? Ben

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collection('/test-db-1/bib')//Q{}libro versus collection('/test-db-1/bib')//libro
by Martin Honnen 30 Mar '20

30 Mar '20

Using BaseX 9.3.2, why does a query collection('/test-db-1/bib')//Q{}libro return 6 items while collection('/test-db-1/bib')//libro gives 0 items? If I run collection('/test-db-1/bib')//Q{}libro, collection('/test-db-1/bib')//libro the info window shows Compiling: - rewrite fn:collection([uri]) to document-node() item: collection("/test-db-1/bib") -> db:open-pre("test-db-1", 12000002) - merge steps: descendant::element(libro) - rewrite fn:collection([uri]) to document-node() item: collection("/test-db-1/bib") -> db:open-pre("test-db-1", 12000002) - remove step without results: element(libro) - rewrite iter step to empty sequence: element(libro) -> () - rewrite cached path to empty sequence: db:open-pre("test-db-1", 12000002)/descendant-or-self::node()/() -> () - rewrite expression list to iter path: (db:open-pre("test-db-1", 12000002)/descendant::element(libro), ()) -> db:open-pre("test-db-1", 12000002)/descendant::element(libro) Optimized Query: db:open-pre("test-db-1", 12000002)/descendant::element(libro) Query: collection('/test-db-1/bib')//Q{}libro, collection('/test-db-1/bib')//libro Result: - Hit(s): 6 Items - Updated: 0 Items - Printed: 1455 b - Read Locking: test-db-1 - Write Locking: (none)

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Re: [basex-talk] serialize with SerialMethod.XML
by jfrm.maurel＠gmail.com 30 Mar '20

30 Mar '20

Hi Christian, Le 30/03/2020 à 15:51, Christian Grün a écrit : > You should always close instances of classes that inherit the > Closeable interface. Thank you for the tip. I will change my code. Regards. -- Jean-François MAUREL PIMECA http://www.pimeca.com

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