If a compound type has been created and there is a wish to have this node ``named'', then use this function for marking this node to be committed. See the HDF5 documentation for a more detailed description on what ``committed'' means.
Arguments:
node: A Datatype node to mark.
testStruct_hid: The HDF5 hid_t reference to the datatype.
Returns 1 if successful and 0 otherwise.