The following functions are defined to retrieve name-value records:
hc_nvr_get_count
hc_nvr_get_value_at_index
hc_nvr_get_long
hc_nvr_get_double
hc_nvr_get_string
hc_nvr_get_binary
hc_nvr_get_date
hc_nvr_get_time
hc_nvr_get_timestamp