Re: [basex-talk] XLink and XPointer

27 Apr 2015

      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"*>

<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] *Im Auftrag von 
*Jérôme Chauveau
*Gesendet:* Montag, 27. April 2015 15:07
*An:* 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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