How do I add conditions to xslt?

[winkimjr2]

I want to check if CompDate has an Op code =E or A
OR if TimeStampChange node is the only node with Op code =E
AND if there are no Op codes on any other child nodes?
i.e. CaseEvent\TimeStampChange Op="E" and there are no Op codes on any other child elements.

If statement will be True when TimeStampChange is the only node in CaseEvent that have Op code=E
If statement will also be true if CompDate Op code =E or A but when TimeStampChange has no Op code.


Here is the xml that I am reading

<CaseEvent Op="E">
	<EventDate>08/06/2019</EventDate>
	<Comment Op="E">no rain</Comment>
	<Deleted>false</Deleted>
	<RevDate Op="E">08/08/2020</RevDate>
	<CompDate Op="E">08/06/2019</CompDate>
	<TimestampChange Op="E">08/06/2019 07:11:28:317</TimestampChange>
	<EventType Word="NOPERWELL">Personal</EventType>
</CaseEvent>

Here is my xslt code. I need help adding and condition to also check if any other child nodes in CaseEvent have Op code

<xsl:if test="(@Op='E') and ((EventType/@Word='NOPERWELL') or (EventType/@Word='NORIGHTS')) and ((CompDate[@Op='A']) or (CompDate[@Op='E']) or ((TimestampChange[@Op='E']) and (//CaseEvent[not(@Op)]/*)))">