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