H5G.open
: group_id = H5G.open (loc_id, name, gapl_id)
Open an existing group, name, at the location specified by loc_id.
gapl_id is the group access property list.
H5G.open returns a group identifier for the group that was opened.
This group identifier should be released by calling H5G.close when
it is no longer needed.
See also: H5G.close