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Note: the "ncid" integer identifies the file and the group within that file. Each group in the file has a different ID.
Calls to nc_create and nc_open return the ID of the root group of the file.
/* Create a file with some nested groups in it, suitable
* to storing information about the Tudor dynasty of England. */
if (nc_create(FILE_NAME, NC_NETCDF4, &ncid)) ERR;
if (nc_def_grp(ncid, HENRY_VII, &henry_vii_id)) ERR;
if (nc_def_grp(henry_vii_id, MARGARET, &margaret_id)) ERR;
if (nc_def_grp(margaret_id, JAMES_V_OF_SCOTLAND, &james_v_of_scotland_id)) ERR;
if (nc_def_grp(james_v_of_scotland_id, MARY_I_OF_SCOTLAND, &mary_i_of_scotland_id)) ERR;
if (nc_def_grp(mary_i_of_scotland_id, JAMES_VI_OF_SCOTLAND_AND_I_OF_ENGLAND, &james_i_of_england_id)) ERR;
if (nc_inq_grp_ncid(ncid, HENRY_VII, &grp_ncid)) ERR;
if (nc_inq_grps(ncid, &num_grps, NULL)) ERR;
if (num_grps != 1) ERR;
if (nc_inq_grps(ncid, NULL, grpid_in)) ERR;
if (nc_inq_grpname(grpid_in[0], name_in)) ERR;
if (strcmp(name_in, HENRY_VII)) ERR;
if (grpid_in[0] != grp_ncid) ERR;
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