Send XML file with curl functions

I am trying to create the following command with the php curl functions: curl -F "data=@domain.xml" "http://path/to/api" The problem i'm having is that i'm creating the xml file with php - so the contents are stored in a variable. How can I send the contents of that variable via curl? I thought just assigning the xml variable to data would work - but it hasn't. Any suggestions? -- Aaron Axelsen lists@frozenpc.net Great hosting, low prices. Modevia Web Services LLC -- http://www.modevia.com