Group

group ::=  identifier ":" "{"
           "alias" ":" hdf5_path_name_array
           "attributes" ":" attribute_collection ","
           "links" ":" link_collection ","
           "created" ":" utc_datetime ","
           "lastModified" ":" utc_datetime ","
           "creationProperties" ":" gcpl
           "}"

link_collection ::=  "[" link_list "]"
link_list       ::=  link ("," link)*
link            ::=  hard_link | soft_link | external_link | ud_link
hard_link       ::=  "{"
                     "class" ":" "H5L_TYPE_HARD",
                     "title" ":" link_name ","
                     "collection" ":" ("datasets" | "datatypes" | "groups" )
                     "id" ":" uuid
                     "creationProperties" ":" lcpl
                     "}"
soft_link       ::=  "{"
                     "class" ":" "H5L_TYPE_SOFT",
                     "title" ":" link_name ","
                     "h5path" ":" unicode_string
                     "creationProperties" ":" lcpl
                     "}"
external_link   ::=  "{"
                     "class" ":" "H5L_TYPE_EXTERNAL",
                     "title" ":" link_name ","
                     "file" ":" unicode_string
                     "h5path" ":" unicode_string
                     "creationProperties" ":" lcpl
                     "}"
ud_link         ::=  "{"
                     "class" ":" "H5L_TYPE_USER_DEFINED",
                     "title" ":" link_name ","
                     "target" ":" byte_array
                     "creationProperties" ":" lcpl
                     "}"
lcpl            ::=  "{"
                     "charSet" ":" char_encoding
                     "creationOrder" ":" non_negative_integer
                     "}"

gcpl                  ::=  "{"
                           ocp ","
                           "filters" ":" "[" link_name_filter_list "]" ","
                           "linkCreationOrder" ":" link_crt_order ","
                           "linkPhaseChange" ":" link_phase_change ","
                           "linksEstimate" ":" links_estimate ","
                           "localHeapSizeHint" ":" non_negative_integer ","
                           "trackTimes" ":" track_times
                           "}"
link_crt_order        ::=   "H5P_CRT_ORDER_TRACKED"
                          | "H5P_CRT_ORDER_INDEXED"
link_phase_change     ::=  "{"
                           "maxCompact" ":" non_negative_integer ","
                           "minDense" ":" non_negative_integer
                           "}"
links_estimate        ::=  "{"
                           "numEntries" ":" non_negative_integer ","
                           "nameLength" ":" non_negative_integer
                           "}"
link_name_filter_list ::=  deflate_filter