Added isExternalDocument method

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29824 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/interfaces/uploadable.py

@@ -112,3 +112,9 @@ class IUploadable(Interface):
 
     XXX - it is unclear whether MAX_REPEAT should be part of signature
     """
+
+  def isExternalDocument():
+    """
+    Returns True if content was downloaded from a URL. Returns False
+    if content was uploaded from a file.
+    """
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