[xwiki-users] Best practice for an API Component

Hi, I would like to access my XWiki from an external web service. The web service would send a tag to XWiki and then receive links to all pages which are tagged with the given tag. I looked at the REST-API and the XMLRPC-API but I couldn't find a way to do the task with these apis. Now i am thinking about writing my own component which would query the tag plugin and then return the results in some way. My question is how can I make a component accessible from outside Xwiki? Is there an easy way to enhance the REST or XML-RCP components or is it possible to use an script on a wikipage to forward a get-request with its paramter to the component? Is there a best practice for tasks like this? Thanks a lot & Kind Regards, Sven