def _get_field(xdmf_file, data_item):
shp = _get_dim(data_item)<EOL>h5file, group = data_item.text.strip().split('<STR_LIT>', <NUM_LIT:1>)<EOL>icore = int(group.split('<STR_LIT:_>')[-<NUM_LIT:2>]) - <NUM_LIT:1><EOL>fld = _read_group_h5(xdmf_file.parent / h5file, group).reshape(shp)<EOL>return icore, fld<EOL>
Extract field from data item.