nsIRDFLiteral* literal = NS_STATIC_CAST(nsIRDFLiteral*, PL_HashTableLookup(mLiterals, aValue));
PLDHashEntryHdr *hdr = PL_DHashTableOperate(&mLiterals, aValue, PL_DHASH_LOOKUP);
RDFServiceImpl::GetLiteral(const PRUnichar* aValue, nsIRDFLiteral** aLiteral){    NS_PRECONDITION(aValue != nsnull, "null ptr");    if (! aValue)        return NS_ERROR_NULL_POINTER;    NS_PRECONDITION(aLiteral != nsnull, "null ptr");    if (! aLiteral)        return NS_ERROR_NULL_POINTER;    // See if we have on already cached    nsIRDFLiteral* literal =        NS_STATIC_CAST(nsIRDFLiteral*, PL_HashTableLookup(mLiterals, aValue));    if (literal) {        NS_ADDREF(literal);        *aLiteral = literal;        return NS_OK;    }    // Nope. Create a new one    return LiteralImpl::Create(aValue, aLiteral);}