RDF and N3 documents under this path accept SPARQL queries via HTTP POST. Configure your client to send the mime type "application/sparql-query".
Create a new document by posting an INSERT query to it. The following example creates a new file called NewFile in the root of the wiki using curl. (Subdirectories are automatically generated for files created in subdirectories.)
$ curl -d "INSERT {<s> <p> <o>}" -H "Content-Type: application/sparql-query" http://dig.csail.mit.edu/2007/wiki/NewFile
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