PRInt32 n; nsresult rv = mContent->GetAttributeCount(n); *aLength = PRUint32(n); return rv;
*aLength = (PRUint32)mArray.Count(); return NS_OK;
DOMAttributeMap::GetLength(PRUint32 *aLength){  PRInt32 n;  nsresult rv = mContent->GetAttributeCount(n);  *aLength = PRUint32(n);  return rv;}