Re: [basex-talk] XLink and XPointer

Florian,

As is said in my previous mail, element scheme with ID references is not well implemented. element(//*[@Id='sid-D453B3D6-0EA6-4607-A413-C6332ABE9F32']) will not be resolved.

You have to determine identified node paths, and replace ids with those paths (element(/1/n1/n2/n3...)

BTW, you have to add a fallback element in your <include/> tags

You will obtain sthg like:

<Links xmlns:xi="http://www.w3.org/2001/XInclude">

<Link>

<xi:include href="process-db.xml" xpointer="element(/1/nx1/nx2/.../nxn)">

xi:fallback...</xi:fallback> </xi:include>

<xi:include href="requirements.xml" xpointer="element(/1/ny1/ny2/.../nyn)"> xi:fallback...</xi:fallback> </xi:include>

</Link>

</Links>

That's not a very satisfactory solution - I know - but it works...

Jérôme

Le 27/04/2015 17:18, Eckey, Florian a écrit :

Hi Jérôme,

i tried to load following xml document (linking-test.xml) in basex (with deactivated internal parser and activated xinclude option) as you mentioned:

<Links xmlns:xi="http://www.w3.org/2001/XInclude">

<Link>

<xi:include href="process-db.xml" xpointer="element(//*[@Id='sid-D453B3D6-0EA6-4607-A413-C6332ABE9F32'])"/>

<xi:include href="requirements.xml" xpointer="element(//*[@Id='11cc0940-c8fb-4b81-920a-1ab5aea30037'])"/>

</Link>

</Links>

The answer form basex is:

„basex/linking-test.xml" (Zeile 3): "include" mit href "process-db.xml" nicht erfolgreich, und es wurde kein "fallback"-Element gefunden.

(I use the german version J; translated: „include“ with href „process-db.xml“ was not successful, and there is no “fallback”-Element found.)

It seems, there is no document with path “process-db.xml”, but it is! If I try: db:path(doc(“process-db”)) it returns “process-db.xml”

Have you any idea, what’s my mistake? Maybe the documents to link have to be stored in a different way?

Thanks and Regards

Florian

*Von:*Jérôme Chauveau [mailto:jerome.chauveau@unicaen.fr] *Gesendet:* Montag, 27. April 2015 16:18 *An:* Eckey, Florian *Cc:* basex-talk@mailman.uni-konstanz.de *Betreff:* Re: AW: [basex-talk] XLink and XPointer

Florian,

When the XINCLUDE option is enabled, xpointers are automatically executed.

/xpointer/ attribute has to be used on an /<include/>/ element (/href/ one is required to point on the xml document)

With this xml contents: in *yourdb/linking.xml:*

<Links*xmlns:xi="http://www.w3.org/2001/XInclude" http://www.w3.org/2001/XInclude*>

<Link> (linking activities with requirements)

<*xi:include href=*”requirements-db.xml” x*pointer=”element(/path/to/activity/with/activity-id-node)”*/> *

       <*xi:include href*=”bpmn-db.xml” 

*xpointer=”element*(*/path/to/requirement/with/requirement-id-node)*”/> *

</Link>

</Links>

• Unfortunately, element scheme with node IDs is not well implemented

(according to my tests) unless your documents are validating against a DTD (link http://www.w3.org/TR/xptr-framework/#term-ddi).

When you'll execute this query (on the REST interface for example):

doc('yourdb/linking.xml')/links/link[1]

will returned:

<Link> (linking activities with requirements) <Activity Id=”activity-id”>

…

</Activity>
<Requirement Id=”requirement-id”>

…

</Requirement>

</Link>

Hope this helps,

Jérôme.

Le 27/04/2015 15:35, Eckey, Florian a écrit :

Hi Jérôme,

thanks for your input. Following situation: I have two documents
in different xml databases (basex). On the one side a business
process model document (bpmn 2.0) and on the other side a
requirements specification document. These documents have to be
consistent. One approach to handle consistency is linking specific
elements of both documents with each other. In my approach, i need
to link activities (xml nodes) and specific requirements (xml
nodes) with each other. So the second approach seems to fit best.
I understand the syntax of this approach, but one time I have to
evaluate this xpointer expressions. Is the evaluation implemented
anywhere? Or how can I do this?

Maybe I even don’t need xinclude, but rather something like this
(more similar to xlink; linking in an external document):

Business process document (xml database in basex):

<Package>

…

<Activity Id=”activity-id”>

…

</Activity>

…

</Package>

Business process document (xml database in basex):

<Requirements>

…

<Requirement Id=”requirement-id”>

…

</Requirement>

…

</Requirements >

Linking:

<Links>

<Link> (linking activities with requirements)

<Locator href=”requirements-db”
xpointer=”element(Activity[@Id=$activity-id])”/> (use xinclude
here feels wrong)

<Locator href=”bpmn-db”
xpointer=”element(Requirement[@Id=$requirement-id])”/>

</Link>

</Links>

Is there something similar? Especially to execute xpointer? Or do
I have to implement it on my own?

Thanks for your answers.

Regards.

Florian

*Von:*basex-talk-bounces@mailman.uni-konstanz.de
<mailto:basex-talk-bounces@mailman.uni-konstanz.de>
[mailto:basex-talk-bounces@mailman.uni-konstanz.de] *Im Auftrag
von *Jérôme Chauveau
*Gesendet:* Montag, 27. April 2015 15:07
*An:* basex-talk@mailman.uni-konstanz.de
<mailto:basex-talk@mailman.uni-konstanz.de>
*Betreff:* Re: [basex-talk] XLink and XPointer

Hi Florian,

The XINCLUDE Option is enabled in the default BaseX configuration.
Which kind of xpointer link do you need?

Those 2 inclusion types seems to be well-implemented is the Java
XInclude support (xinclude implementation used in BaseX):

 1 - full document inclusion: <xi:include href='myDocument.xml'/>
 2 - Fragment inclusion: <xi:include href='myDocument.xml'
xpointer='element(/1/path/to/fragment' />

Hope this helps,

Regards.

Jérôme


Le 27/04/2015 13:29, Eckey, Florian a écrit :

    Hello,

    i am actually writing my master thesis using basex for xml
    processing. I need to create consistency links between two xml
    documents, especially basex databases and its content. So I am
    certainly looking for xlink and xpointer implementations in
    basex. Are there any examples to do this with basex or if not,
    has anyone implemented an xquery version to execute it? I
    recoginzed that there are capabilities with xinclude. But I
    does not find any references of xinclude in basex, unless
    this: http://docs.basex.org/wiki/Options#XINCLUDE

    So has anyone ideas or experiences using xlink and especially
    xpointer with basex or xquery?

    Regards,

    Florian

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