[kepler-users] Extracting XML Attributes

[Daniel Crawl]

Hi Jon,

The nightly build is temporarily not being generated, so you
will have to download and compile the source. The instructions
for this can be found here:

https://dev.kepler-project.org/developers/reference/downloading-and-building-the-kepler-source-code/

Please let us know if you have any problems,

  --dan


Jon Goodall wrote:
> Hi Dan,
>
> Do I need to use the nightly build of Kepler to get the updated XPath 
> actor?  I'm having trouble running the attached workflow with the 1.0 
> Kepler version. 
>
> Thanks,
> Jon
>
> On Tue, Oct 14, 2008 at 6:41 PM, Daniel Crawl <crawl at sdsc.edu 
> <mailto:crawl at sdsc.edu>> wrote:
>
>
>     Hi Jon,
>
>     I've updated the XPath actor with a new port that outputs
>     attribute or text() data. Attached is a modified version
>     of your workflow that uses this functionality.
>
>     Let me know if you have questions,
>
>      --dan
>
>
>     Jon Goodall wrote:
>
>         Hello,
>
>         I'm trying to extract XML attributes from a web service in
>         Kepler and
>         could use some help.  I've tried doing this a couple different
>         ways.
>         First, I tried the following xpath query:
>         /timeSeriesResponse/timeSeries/values/value/@dateTime and the
>         exception is ...
>
>         ptolemy.kernel.util.IllegalActionException: XPath: node
>         selected with
>         XPath isn't an element.
>               at org.sdm.spa.XPath.fire(XPath.java:167)
>               at ptolemy.actor.AtomicActor.iterate(AtomicActor.java:398)
>               at
>         ptolemy.actor.sched.StaticSchedulingDirector.fire(StaticSchedulingDirector.java:170)
>               at
>         ptolemy.actor.CompositeActor.fire(CompositeActor.java:400)
>               at ptolemy.actor.Manager.iterate(Manager.java:688)
>               at ptolemy.actor.Manager.execute(Manager.java:332)
>               at ptolemy.actor.Manager.run(Manager.java:1071)
>               at ptolemy.actor.Manager$3.run(Manager.java:1112)
>
>         The xpath query /timeSeriesResponse/timeSeries/values/value
>         works fine
>         and gives this response ..
>
>         send to channel 0: {<value dateTime="2000-01-01T00:00:00"
>         qualifiers="A">483</value>, <value dateTime="2000-01-02T00:00:00"
>         qualifiers="A">464</value> ...
>
>         I've also tried using an XMLDisassembler actor to access the
>         dateTime
>         attributes, but no luck.  I was able to get the values, but
>         unable to
>         get the dateTimes (I tried setting the port name to @dateTime
>         and to
>         dateTime).  See attached workflow for details.
>
>         One other thing to note is that this service I'm using can return
>         either simple or complex types.  Right now, I'm working with the
>         simple type, which is a XML string.  I tried using the complex web
>         service actor, but still was unable to get at the dateTime
>         attributes.
>          If you want to try this yourself, the service is
>         http://river.sdsc.edu/wateroneflow/NWIS/DailyValues.asmx?WSDL.
>          The
>         method GetValues returns the XML string, the method
>         GetValuesObject
>         returns a complex type.
>
>         The workflow is attached if you want to take a look.  The goal is
>         simply to create a chart of the streamflow time series.  I would
>         appreciate any help on this.  Thanks in advance!
>
>         Jon
>
>         Jonathan Goodall
>         Civil and Environmental Engineering
>         University of South Carolina
>          ------------------------------------------------------------------------
>
>         _______________________________________________
>         Kepler-users mailing list
>         Kepler-users at ecoinformatics.org
>         <mailto:Kepler-users at ecoinformatics.org>
>         http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-users
>
>
>