What is difference between -Dwtpversion and wtpversion?

I am new to Maven. I am going to develop my first application in with Maven. So while reading the documentation I found mvn eclipse:eclipse -Dwtpversion=2.0

I know WTP is the "Web Tools platform", but what is -Dwtpversion? I searched on the Internet, but didn't find anything.


The "-D" prefix in the argument means that it's a system property.

A system property is defined like this in(http://docs.oracle.com/javase/jndi/tutorial/beyond/env/source.html#SYS):

A system property is a key/value pair that the Java runtime defines to describe the user, system environment, and Java system. The runtime defines and uses a set of default system properties. Other properties can be made available to a Java program via the -D command line option to the Java interpreter.

mvn eclipse:eclipse -Dwtpversion=2.0 makes it a maven project that can be run from eclipse

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