Periodicity

Overview

Periodicity specifies the regular frequency with which a publication is issued or a recurring event occurs. It provides temporal classification for genuine periodical research content — daily market commentary, weekly sector reviews, quarterly outlooks — and for events that recur on a fixed schedule. The frequency is expressed via the required periodicityValue attribute drawn from PeriodicityEnum, with an optional publisherDefinedValue attribute for custom frequencies not covered by the standard enumeration (sources: data-dictionary-2.5.1 p.53, user-guide-2.1 p.35).

Usage

Periodicity is an optional element that appears within ProductSeries to describe how often a serial publication is issued, and (from v2.2 onward) within EventDetails to describe how often a recurring event occurs (sources: user-guide-2.2 p.36, data-dictionary-2.5.1 p.53). A single occurrence is expected per parent. The periodicityValue attribute is required and must be drawn from PeriodicityEnum, which covers frequencies from hourly through annual [user-guide-2.1 p.35]. When periodicityValue is set to PublisherDefined, the publisherDefinedValue attribute must carry a free-text description of the custom frequency [user-guide-2.2 p.36]. The element should only be applied to *genuine* periodicals — named, recurring series such as "Tech Weekly" or "Quarterly Coal Review" — and not to ad-hoc reports that simply happen to be published frequently. For non-periodical content, omit the element entirely rather than supplying a null or placeholder value [data-dictionary-2.5.1 p.18].

Rules

• MUSTWhen periodicityValue is set to PublisherDefined, publisherDefinedValue must be supplied to describe the custom frequency.[RIXML User Guide v2.2 p.36] [RIXML Research Data Dictionary v2.4 p.51] [RIXML Research Data Dictionary v2.5.1 p.53]
• MUSTPeriodicity should be applied only to reports published at regular fixed intervals as part of a named, recurring series, not to all output of a publisher that happens to publish frequently.[RIXML Research Data Dictionary v2.5.1 p.18] [RIXML Research Data Dictionary v2.4 p.18]
• SHOULDFor non-periodical content, omit Periodicity entirely rather than including it with a null or placeholder value.[RIXML Research Data Dictionary v2.5.1 p.18]
• SHOULDThe periodicityValue selected should match the actual publication interval (e.g. Weekly for weekly publications, Quarterly for quarterly publications).[Best Practices for Publishing RIXML p.24]

Relationships

• child-ofProductSeries — Periodicity appears as an optional child of ProductSeries to declare the publication frequency of the series.
• child-ofEventDetails — From RIXML 2.2 onward, Periodicity may also appear within EventDetails to indicate the recurrence frequency of an event.
• constrained-byPeriodicityEnum — The periodicityValue attribute draws its allowed values from PeriodicityEnum.
• related-toProductDetails — Whether Periodicity is applied is connected to the broader periodical character of the product, also reflected on ProductDetails; the element should only be used for true periodical content.