Incrementing Variable value in XSLT

Summary:

Hello Team,

I have a requirement in XSLT where I need to keep on incrementing the value of counter variable by 1 whenever any of the for each loop execution is completed. And increment the ordCounter variable by 1 only when order for loop is completed.
Given below is the expected payload.

Content (please ensure you mask any confidential information):
Hello Team,

I have a requirement in XSLT where I need to keep on incrementing the value of counter variable by 1 whenever any of the for each loop execution is completed. And increment the ordCounter variable by 1 only when order for loop is completed.