Add macros for Confluence for Plugin Contest pages?

Is it possible to use some macros, like:
{repository-plugin:id=MyPlugin}

To include information from repository to Confluence page.
Look example here:
http://confluence.atlassian.com/display/CONFEXT/GoogleMapsPlugin

The first table on this page - it macros execution result: The source of page contains only:
{repository-plugin:key=com.atlassian.confluence.ext.gmaps}

Description

A macro for including Google Maps of particular addresses within a page.
...

Thanks!

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