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5252 discussions

RESTXQ accept/produces issue
by Marc van Grootel 22 Apr '15

22 Apr '15

Hi, I spend a couple of hours pulling my "hair" before I realized what was going on here. Question: what happens when I call a RESTXQ function which has a rest:produces('application/xml') annotation but the request does not have a Accept header? This is what HTTP 1.1 spec[1] says about that: "If no Accept header field is present, then it is assumed that the client accepts all media types. If an Accept header field is present, and if the server cannot send a response which is acceptable according to the combined Accept field value, then the server SHOULD send a 406 (not acceptable) response." In fact, what does happen is that you get a 404, and this is caused by the rest:produces annotation. In a REST call you do not always set or have the option to set an appropriate accept header (e.g. HTTP client libraries or when doing doc('http://.....') call from XSLT). I believe that when no Accept header is present the response should assume that any mediatype is ok. Additionally it would be nice for REST clients if in case the path matches but the content-negotiation fails that a 406 would be returned instead of a 404. The latter is saying the resource does not exist, whereas 406 expresses that the issue is with the media-type but the resource may exist. Quite possibly the text in the RESTXQ spec has to be modified as well in that case because it currentlly reads (consistent with current behaviour): "If the %rest:produces annotation is specified, a function will only be invoked if the HTTP Accept header of the request matches one of the given types." Would it be possible to get this changed? Or is it maybe better to take this up in another forum? [1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html [2] http://exquery.github.io/exquery/exquery-restxq-specification/restxq-1.0-sp… --Marc

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Creation of Full-Text-Index failed
by Goetz Heller 21 Apr '15

21 Apr '15

Addendum: This is an issue with German language only. Indexing with all other languages work as expected given there is enough RAM available to the JVM (sometimes the error messages issued are somewhat strange when they report negative array indexes in case of insufficient memory). Meanwhile I found two other packages exhibiting the same problem. The Java Batch runs on a Windows 8 Box with Base 8.1.1 and Java 1.8.0_40_b25 installed in client-server mode.

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Optimizing Element Access By Attribute Value Matching
by Eliot Kimber 21 Apr '15

21 Apr '15

DITA defines the notion of layered hierarchy of element types, where every DITA-defined element is either a base type or a "specialized" type derived from some base type. The type hierarchy of each element is specified by a @class attribute that lists the ancestry and leaf type of the element. For example, the element type "concept" is a specialization of the base type "topic" and so has a @class value of "- topic/topic concept/concept ". Each blank-delimited term is a module name/element name pair. Processing in DITA is "specialization aware" if selection of elements is in terms of a @class token rather than concrete element type. For example, you might apply processing to topics of any type by matching on "*[contains(@class, ' topic/topic ')]", which will match all DITA topics, regardless of their specialized type. The challenge this presents in a database context is optimizing finding of things based on these @class values. For large repositories an XQuery like "//*[contains(@class, ' topic/topic ')]" is going to be quite slow as it requires a string comparison of every @class value. Even if there is an attribute value index it will still be slow. The obvious solution would be to index by @class token, e.g., an index where keys are "topic/topic", "topic/p", etc. Is there a way to construct such an index in BaseX? Is there a better to address type of string-match-based lookup? Thanks, Eliot ————— Eliot Kimber, Owner Contrext, LLC http://contrext.com

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Simple xQuery functions do not work as expected
by Goetz Heller 21 Apr '15

21 Apr '15

Hi Christian, nice tip - I did not know this. With BaseX I'm really a newbie, and I just try to get my work done. As to now, it's a very nice experience, and BaseX supports many of the requirements I have. I'll give it a try and let you know! Kind regards

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Simple xQuery functions do not work as expected
by Goetz Heller 21 Apr '15

21 Apr '15

I think the issue is not of great relevance. Up to now, I hadn't the issue when working programmatically, so it appears to be a GUI problem which probably could be solved be assigning more memory to the runtime. I did not try this out. However, I can see that I'm quite often in the red region of memory consumption after a having worked with it a while. I'm going to start a larger batch these days crunching through several gigs of data. If this problem arises there I'll let you know. Kind regards, Goetz

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Strange bug ? testing the db:path of a non-stored database node
by cmarchand＠oxiane.com 21 Apr '15

21 Apr '15

Hello, I have this error. According to http://docs.basex.org/wiki/Database_Module#Database_Nodes, I thought modify() was transforming a node to a database node It seems it does not initialize a document name... Best regards, Christophe Error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 8.1 Java: Oracle Corporation, 1.8.0_31 OS: Windows 7, amd64 Stack Trace: java.lang.NullPointerException at org.basex.query.value.item.Str.get(Str.java:49) at org.basex.query.func.db.DbPath.item(DbPath.java:23) at org.basex.query.expr.ParseExpr.value(ParseExpr.java:64) at org.basex.query.QueryContext.value(QueryContext.java:415) at org.basex.query.up.expr.Transform.value(Transform.java:91) at org.basex.query.up.expr.Transform.iter(Transform.java:59) at org.basex.query.up.expr.Transform.iter(Transform.java:25) at org.basex.query.MainModule.iter(MainModule.java:114) at org.basex.query.QueryContext.iter(QueryContext.java:343) at org.basex.query.QueryContext.execute(QueryContext.java:605) at org.basex.query.QueryProcessor.execute(QueryProcessor.java:98) at org.basex.core.cmd.AQuery.query(AQuery.java:83) at org.basex.core.cmd.XQuery.run(XQuery.java:22) at org.basex.core.Command.run(Command.java:379) at org.basex.core.Command.execute(Command.java:95) at org.basex.gui.GUI.exec(GUI.java:466) at org.basex.gui.GUI.access$400(GUI.java:41) at org.basex.gui.GUI$7.run(GUI.java:410) Query: copy $c := <test/> modify () return db:path($c) Query plan: <QueryPlan compiled="true"> <Transform> <Let> <Var name="$c" id="0" as="node()"/> <CElem> <QNm value="test" type="xs:QName"/> </CElem> </Let> <Empty size="0"/> <DbPath name="path(node)"> <VarRef> <Var name="$c" id="0" as="node()"/> </VarRef> </DbPath> </Transform> </QueryPlan>

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Specific elements as function input types
by Kristian Kankainen 20 Apr '15

20 Apr '15

Hello! I wonder why I get a syntax error in BaseX for the following code. Is it really not possible to specify this fine granularity for function input types? <code> declare variable $local:ns := "somenamespace declare function local:afunction( $input as element( QName( $local:ns, "elementname" ) ) ) { <function-body /> }; </code> I get error XPST0003 Expecting ')' found '('. Best regards Kristian Kankainen

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Updating xml takes more than usual
by George Karakatsiotis 20 Apr '15

20 Apr '15

Hi all, I have deployed basex.war (8.0.3) in a resin web server (with default options) and sometimes updating takes longer than usual. Here is a snippet from .logs: 1 resource(s) replaced in 2323.41 ms. 423273.55 ms My understanding is that updating takes 2323.41 ms, but overall the whole process takes 423273.55 ms. Do you have any suggestion what could be the cause of these delays? I should note that this happens while processing a big batch of documents in parallel (each HTTP request is in a different thread). Thank you for your time, GK

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Working With Maps Using FLOWR Expressions?
by Eliot Kimber 19 Apr '15

19 Apr '15

I think I'm missing something fundamental but I haven't been able to find a relevant example of what I'm trying to do. I suspect I'm being derailed by procedural brain damage. I have a function that takes as input a map and will return a new map reflecting updates applied to input map. The business logic of this function is to iterate over some sequence and add or update map items as needed, e.g.: let $map := map { } for $key in ('A', 'B') return map:put($map, 'A', 'somevalue') The problem is that each interation of the for loop returns a new map. In the context of a FLOWR expression I'm not seeing how to effectively update the same map instance. What fundamental aspect of map manipulation am I missing? Thanks, Eliot ————— Eliot Kimber, Owner Contrext, LLC http://contrext.com

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How To Reflect XML Source in HTML Output?
by Eliot Kimber 17 Apr '15

17 Apr '15

I'm use the RESTXQ stuff (very nice) to build a little DITA link management application. In the service of this I need to sometimes show the raw XML source of the docs in the repo. I looked at the DBA Web app and it looks like it's using some Javascript for this and I didn't see any obvious solution in the various BaseX packages, but I could have missed something. I hacked a quick little typeswitch transform just to get something but it doesn't preserve newlines from the source XML (but I notice the DBA Web app does, so they must be preserved under the covers). Is there a built-in way to generate escaped XML for use in e.g., HTML <pre> or is there some silly thing I need to do in my typeswitch to make sure the newlines make it to the HTML result? Thanks, Eliot ————— Eliot Kimber, Owner Contrext, LLC http://contrext.com

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