is a helper for _loadOneSource.

def _loadThreePartSource(self, sourceFName, sourceLines):
        """is a helper for _loadOneSource.
        """
        lineno = 1
        for ln in sourceLines:
            lineno += 1
            try:
                stem, pubType, source = ln.split("\t", 2)
                stem = stem.strip()[-9:]
                self._addPub(stem, source)
                if pubType=="C":
                    self.confstems[stem] = 1
            except ValueError:
                sys.stderr.write("sourcematchers.py: %s (%d): skipping source line: %s"%(sourceFName,lineno,ln))