Java, naming convention question

I see in the documentation the

Class MQConnectionMetaData 

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in the package Package

com.ibm.mq.jms, 

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Can I assume that the package com.ibm.mq.jms is contained in the jar file:

com.ibm.mqjms.jar

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The odd thing is there is no '.' between the mq and the jms in the jar file name

Thanks