java - can someone explain me the syntax of '${' and ':' in standalone.xml? -

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can explain me syntax of '${' , ':' in standalone.xml of jboss (for example) , in :

port-offset="${jboss.socket.binding.port-offset:0}" ?

i know 'jboss.socket.binding.port-offset' system properties . if being set - overwrite 0 value? meaning of ':' in context ?

from here

as can see contains beanshell expression means, unless jboss.socket.binding.port-offset set, evaluates 0 standard sockets.


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