Hello,
I am Struggling a lot to compare an xml element against null in decision tables. When I check an element against null, the rule is not firing though I am not passing any thing.
Interestingly, If I check element!=null against false, it is working. Please help me to find the right way to do this. Please find the below test.

Here Just to test that the service is working I am passing ABC and getting same ABC in output,

Now If I pass no value, I am not getting the text "NULL" that I have assigned in decision table.

Just in case, If it make sense, here is my XSD code
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.something.com/TestData" elementFormDefault="qualified"
xmlns:xs="[http://www.w3.org/2001/XMLSchema](http://www.w3.org/2001/XMLSchema)" xmlns:testIn="[http://www.something.com/TestData](http://www.something.com/TestData)">
\<xs:element name="TestElement" type="testIn:TestElementType"/>
\<xs:complexType name="TestElementType">
\<xs:sequence>
\<xs:element name="Input" type="xs:string"/>
\<xs:element name="Output" type="xs:string"/>
\</xs:sequence>
\</xs:complexType>
</xs:schema>
Thanks For the help,
N.