Aassign xsi:nill values from element to BPEL variable - Urgent..Plz..

Question

Hi all,I have a BPEL process which calls a Webservice,and at the end it transforms the output of the Webservice to the Output Variable in my BPEL process,but the thing is this process retuns elements with xsi:nil="true" and I get an error which says
*Could not initiate the BPEL process because the input xml is not well formed, the reason is :
Error parsing envelope: (4, 3679) Namespace prefix 'xsi' used but not declared. Please correct the input xml.*
I have verified the WSLD,.bpel file,the xsd..they all have xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
Heres the code of the assign
<from xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
variable="Invoke_P_getlV_OutputVariable"
part="parameters"
query="/ns7:getCViewResponse/ns7:getCViewReturn"/>
<to xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
variable="outputVariable" part="payload"
query="/ns1:GetOfferResponse/ns1:getCVResponse/ns1:getCViewReturn"/>
Please temme how do I get this to wrk...I need to get this working immediatly..

Answer 1

If you need to "clean" some xml from null values (empty tags) you can create an XSLT (like RemoveNullTags.xsl) with the following code:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:apply-templates select="@*|node()"/>
</xsl:template>
<xsl:template match="@*|node()">
<xsl:choose>
<xsl:when test="normalize-space(.)">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:when>
<xsl:when test="count(./*)">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:when>
<xsl:otherwise>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
This xslt will remove all the empty tags on your XML. So after you create this and paste it on your project, you need to use it into an ASSIGN activity like this:
<assign name="Remove_Nulls">
<copy>
<from expression="ora:processXSLT('RemoveNullTags.xsl',bpws:getVariableData('inputVariable','payload'))"/>
<to variable="inputVariable" part="payload"
query="/ns2:writeCollectedDeleteElement"/>
</copy>
<copy>
<from expression="ora:processXSLT('RemoveNullTags.xsl',bpws:getVariableData('inputVariable','payload'))"/>
<to variable="inputVariable" part="payload"
query="/ns2:writeCollectedDeleteElement"/>
</copy>
</assign>
As you can see in this sample, i make 2 copy operations because i have xml arrays, so i need a copy operation for each child the xml element have.
HTH,
Andres