# Codelist Catalog

This report describes the ISO TC211 codelist catalogs, the codelists they contain, and the values and definitions of the codes.

Please contact Ted Habermann if you have questions or suggestions.

## Catalog

Name: Codelists from the Metadata for Maintenance Information (mex) Namespace
Scope: Codelists from the Metadata for Maintenance Information (mex) Namespace
Field of application: ISO TC211 Metadata Standards
Version: 1.1
Date: 2017-09-10
Number of CodeLists: 1
Number of items: 15

## Codelists

## MD_MaintenanceFrequencyCode :

Description: frequency with which modifications and deletions are made to the data after it is first produced
CodeSpace: http://standards.iso.org/iso/19115/-3/mmi/1.0
Number of items: 15

Entry | Definition
--- | ---
continual | resource is repeatedly and frequently updated
daily | resource is updated each day
weekly | resource is updated on a weekly basis
fortnightly | resource is updated every two weeks
monthly | resource is updated each month
quarterly | resource is updated every three months
biannually | resource is updated twice each year
annually | resource is updated every year
asNeeded | resource is updated as deemed necessary
irregular | resource is updated in intervals that are uneven in duration
notPlanned | there are no plans to update the data
unknown | frequency of maintenance for the data is not known
periodic | resource is updated at regular intervals
semimonthly | resource updated twice a monthly
biennially | resource is updated every 2 years

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