'Generate a CIX <scope ilk="blob"> tree for the given CSL
(client-side language) tokens and append the blob to the given
file element.
A language that supports being a client-side language in a
multi-lang document must implement this method. Realistically
this just means JavaScript for now, but could eventually include
Python for the new Mozilla DOM_AGNOSTIC work.'

def scan_csl_tokens(self, file_elem, blob_name, csl_tokens):

    raise VirtualMethodError('CILEDriver.scan_csl_tokens')
