When I used the google geo service i met "Required item type of first operand of '/' is node(); supplied value has item type xs:string" problem

[ShiYU Gao]

HI:

I'm a new user of the emml. When I use the <driectinvoke> to invoke
the google's geo service and use the XPath expression to do the
mashup, met an error like this

<error>
<errorMessage>1002</errorMessage>
<errorMessage><![CDATA[Required item type of first operand of '/' is
node(); supplied value has item type xs:string]]> </errorMessage>
</error>

and my emml is :

<directinvoke endpoint="http://maps.google.com/maps/api/geocode/xml"
latlng="$lanlon"
sensor="false"
outputvariable="$address" />
<display expr="$address//formatted_address"></display>
<appendresult outputvariable="$result">
<result>
<address>{$address//GeocodeResponse/result/formatted_address}
</address>
</result>
</appendresult>


please help me.
BRS

[Raj]

Hi,

Can you check what the response from google geocoding service is i.e.,

<display message="Google geocoding response = "  expr="$address"/>

It is probably returning a error response message.

Typically, you get that error message  when trying to dereference a string value in a variable as XML document.

thanks,

raj

[ShiYU Gao]

Hi,

I have printed the result of the google geocoding response. It is like this:

<?xml version="1.0" encoding="UTF-8"?>

<GeocodeResponse>

 <status>OK</status>

 <result>

  <type>street_address</type>

  <formatted_address>279-281 Bedford Ave, Brooklyn, NY 11211, USA</formatted_address>

  <address_component>

   <long_name>279-281</long_name>

   <short_name>279-281</short_name>

   <type>street_number</type>

  </address_component>

.....................

......................

 </result>

</GeocodeResponse>

It is a qualified xml response. But in the XPath it still product the error message.

thanks,

ShiYU Gao

2010/12/9 Raj <rajmohan.kr...@jackbe.com>

[Raj]

1. Can u send the server stack trace associated with this error.  (from your appserver console or log file)

2. I tried to re-produce this issue, but am able to execute the following equivalent EMML successfully:

        <output name="result" type="document"/>

        <variable name="latlng" type="string" default="40.714224,-73.961452"/>

        <directinvoke endpoint="http://maps.googleapis.com/maps/api/geocode/xml"

                       latlng="$latlng"

                        sensor="false"

                        outputvariable="$address" />                 

        <display expr="$address//formatted_address"></display>       

        <appendresult outputvariable="$result">

            <result>

             <address>{$address//GeocodeResponse/result/formatted_address}

             </address>

            </result>

        </appendresult>

The output :

<?xml version="1.0" encoding="UTF-8"?>

<xml>

   <result>

      <address>

         <formatted_address>279-281 Bedford Ave, Brooklyn, NY 11211, USA</formatted_address>

         <formatted_address>Williamsburg, New York, USA</formatted_address>

         <formatted_address>New York, NY 11211, USA</formatted_address>

         <formatted_address>Brooklyn, NY, USA</formatted_address>

         <formatted_address>Kings, New York, USA</formatted_address>

         <formatted_address>New York, NY, USA</formatted_address>

         <formatted_address>New York, USA</formatted_address>

         <formatted_address>United States</formatted_address>

      </address>

   </result>

</xml>

[ShiYU Gao]

Hi，

Thank you very much. My code is working now. Thanks again.

thanks,

ShiYU Gao

2010/12/10 Raj <rajmohan.kr...@jackbe.com>

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