The below solution that you suggested in the email works peractly fine for me without any errors.

Solution By Randal:
I looked at your issue. To make this work you will have to change the XpathSelector property in the XSD for both ExpirationDate and IssueDate (see below). After changing the XpathSelector drag the changed facts to your rule. You don’t need the exists in the rule anymore you just only need to use the ‘is greater or equal’ predicate.. The existence check is included in the xpath now.

ExpirationDate:
XPathSelector:
/*[local-name()='Provider' and namespace-uri()='urn:Access.XYZ.Provider']/*[local-name()='ProviderLicense' and namespace-uri()='urn:Access.XYZ.Provider'][count(*[local-name()='IssueDate']) = 1 and count(*[local-name()='ExpirationDate']) = 1]

IssueDate:

XPathSelector:
/*[local-name()='Provider' and namespace-uri()='urn:Access.XYZ.Provider']/*[local-name()='ProviderLicense' and namespace-uri()='urn:Access.XYZ.Provider'][count(*[local-name()='IssueDate']) = 1 and count(*[local-name()='ExpirationDate']) = 1]

Thanks once again.

Thanks for your comment to my post. Sorry I did not respond earlier.

Can you please mail me the exported policy (and optionally vocabulary) and one or more sample instance(s) so I can have a look.
You can find my e-mail address on the about page of my blog.

Thanks!

Business rule is ExpirationDate can not be less than IssueDate (If both elements are present). At the same time both of these elements are optional, if I pass the following xml to BRE.

abcder12
1980-01-01T00:00:00
1985-01-01T00:00:00

xyz456

I’m getting the following error
Field “*[local-name()='IssueDate' and namespace-uri()='urn:GeoAccess.PDE.Provider']” does not exist in XML document “Provider”, selector “/Provider/ProviderLicense”.

However the rules works fine, if there is only one node or all elements are present inside the node.

AND
IssueDate Exists in ProviderLicense
ExpirationDate Exists in ProviderLicense
IssueDate is greater than or equal to ExpirationDate

Thanks in advance.