NameSpaceImpl* child = new NameSpaceImpl(mManager, this, aPrefix, aURI);
if (FindNameSpaceURI(aNameSpaceID)) { NameSpaceImpl* child = new NameSpaceImpl(mManager, this, aPrefix, aNameSpaceID);
NameSpaceImpl::CreateChildNameSpace(nsIAtom* aPrefix, const nsAReadableString& aURI,                                nsINameSpace*& aChildNameSpace){  NameSpaceImpl* child = new NameSpaceImpl(mManager, this, aPrefix, aURI);  if (child) {    return child->QueryInterface(kINameSpaceIID, (void**)&aChildNameSpace);  }  aChildNameSpace = nsnull;  return NS_ERROR_OUT_OF_MEMORY;}