nsIAtom *tag; aContent->GetTag(tag); return (tag != 0 && tag == nsSelection::sCellAtom);
nsCOMPtr<nsIAtom> tag; aContent->GetTag(*getter_AddRefs(tag)); return (tag != 0 && tag.get() == nsSelection::sCellAtom);
static PRBool IsCell(nsIContent *aContent){  nsIAtom *tag;  aContent->GetTag(tag);  return (tag != 0 && tag == nsSelection::sCellAtom);}