Where are the supported jdbc drivers listed for the liquibase-maven-plugin?

General Discussion
1
I am trying to configure
          oracle.jdbc.driver.OracleDriver
          jdbc:oracle:thin:@tf-appserv-linux:1521:xeHow do I know what to use for PostgreSQL? Is it documented anywhere?
2

Okay, after some sleuthing around on the internet, ??? is the Java class name for the JDBC Driver.