Issue raised by Andrea Perego.
In ISO 19115, element “Maintenance information” is meant mainly to describe how frequently a resource is updated.
DCAT and DCAT-AP, the update frequency is expressed through dct:accrualPeriodicity, with the frequency codes defined in the Dublin Core Collection Description Frequency Vocabulary, which can be partially mapped to the ones used in ISO 19115, as shown in the following table (the missing alignments are in bold).
NB (Andrea Perego): This table has been revised on 22/04/2015 based on Madeleine's comment to issue VO4 (that issue is strictly related to the one under discussion here).
|
continual |
continuous |
|
daily |
daily |
| threeTimesAWeek | |
| semiweekly | |
|
weekly |
weekly |
|
fortnightly |
biweekly |
| threeTimesAMonth | |
| semimonthly | |
|
monthly |
monthly |
| bimonthly | |
|
quarterly |
quarterly |
| threeTimesAYear | |
|
biannually |
semiannual |
|
annually |
annual |
| biennial | |
| triennial | |
|
asNeeded |
|
|
irregular |
irregular |
|
notPlanned |
|
|
unknown |
|
Comments
During the 3rd WG meeting of 29 April 2015, Willem Van Gemert pointed out that the metadata registry of the Publications Office also has a controlled vocabulary on frequency information (NAL frequencies) under preparation.
During the 3rd WG meeting of 29 April 2015, it was decided by vote that
The GeoDCAT-AP proposal for maintenance information (update frequency) is accepted by the Working Group. This entails that update frequency is expressed through dct:accrualPeriodicity, with the frequency codes defined in the Dublin Core Collection Description Frequency Vocabulary,
Alignments concerning optional elements of maintenance information are not required.