[Liquibase-user] New Topic: diff in version liquibase-2.0-rc7 requires referenceUrl parameter

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When trying to run the diff command on two databases I got the error:
Liquibase Update Failed: referenceUrl parameter missing. For more information, use the --logLevel flag)

The command I run looks like this:

liquibase --driver=oracle.jdbc.driver.OracleDriver
--classpath=ojdbc6.jar
--url="jdbc:oracle:thin:@dbserver:1521:TEST"
--username=newdb
--password=newdb
diff
--baseUrl="jdbc:oracle:thin:@dbserver:1521:TEST"
--baseUsername=basedb
--basePassword=basedb

When running it in version 1.9.5 it works fine.
1. What should I specify with parameter referenceUrl?
2. If I must use it, why is it necessary to use the referenceUrl parameter when I want to compare two databases?

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