[kepler-users] Extracting XML Attributes

[Daniel Crawl]

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
>   
> ------------------------------------------------------------------------
>
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