Sharepoint 2007 custom web service

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SharePoint

webservice

Hello!

I have a question about a custom web service, that would populate an xml file(from the fields), wich would be later transfered to a sharepoint library along with some meta data, that is used for searching varius documents... The problem is (in my opinion) that the user(who will use this service) is not on the same network/domain as the sharepoint server is and integrated sharpoint services cannot be used... So my question is how to best resolve this problem.

Thank you for your answers...