A lot has been said and written about removing null tags in xml messages. Any integration ace will always suggest to go for XSLT to transform XML while an siebel eScript enthusiast will defend stating business service will be ideal way to achieve this. But a laggard like me is always in search of solution which is easier to implement and flexible enough to handle frequent changes. After peppering siebel forums one of my friend came up with devilicious idea of using the data mappers itself to remove the null tags.
As per siebel booskshelf:
"The Integration Component Fields list displays the list of fields for that component. Note the system fields Conflict Id, Created, Id, Mod Id, Updated, operation, and searchspec in the list. This setting prevents the EAI Siebel Adapter Query and QueryPage method from outputting these fields."
It says that system fields are not the part of output XML. Any integration field of type "System" is not included in the ouput siebel message of EAI Siebel Adapter. So key here is, if the tag is null we can replace it in datamapper with any system field.
Consider a scenario if description is blank in Service Request then we don't want Description Tag send to external system in the outbound message. In order to remove the null tag we can use following expression in the DataMap:
IIF([Description] IS NULL,[Created],[Description])
In this Description and Created are integration fields of IC. Created is of type System, so if description is coming as null then we are passing Created. Here as Created is system field it will not come up in the ouput message after conversion. Now one may say how to remove entire instance if all the tags are null. Siebel also has solution to that. Try out Source Search Expression for this scenario.
Other Approach:
XSLT to remove the null tag from Siebel Message
<!--
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="@*|node()">
<xsl:if test=". != '' or ./@* != ''">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
-->