Relative Time Interval

The SEDRIS Data Representation Model APPENDIX A - Classes Relative Time Interval

Class Name: Relative Time Interval

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies an interval of time, defined by a start time and a stop time that are relative to another time.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

This class appears on only one page of the DRM class diagram.

Example

The <Relative Time Interval> instance specifies the time period for which a transmittal should be considered to be valid. The stop time can be considered to be the time at which the validity expires.

FAQs

What is the purpose of this class?: This class provides a mechanism for specifying a time interval in terms of times relative to another time. The time interval is used to specify ISO 19115-compliant metadata that describes a time period that is significant for some high-level DRM object (e.g., an instance of <Transmittal Root>, <Model>, or <Image>) and as a general-purpose mechanism for describing time intervals. <Relative Time Interval> allows potential users of a transmittal or DRM object to evaluate a time period significant for that transmittal or DRM object without necessarily obtaining or examining the transmittal or DRM object directly.
How can a data provider specify a time interval relative to start of simulation?
: This is specified by omitting the <Absolute Time> component. If there is no <Absolute Time> component, the deltas are relative to simulation start.

Constraints

Composed of (two-way)

zero or one <Absolute Time> instance¹

Component of (two-way) (inherited)

zero or more <Environment Root> instances
zero or more <Time Constraints Data> instances
zero or one <Transmittal Root> instance
zero or more <Season> instances
zero or more <Sound Instance> instances
zero or more <Source> instances

Field Elements

SE_Integer	delta_start_days;	³
SE_Integer	delta_stop_days;	⁴
SE_Byte_Unsigned	delta_start_hours;	⁵
SE_Byte_Unsigned	delta_stop_hours;	⁶
SE_Byte_Unsigned	delta_start_minutes;	⁷
SE_Byte_Unsigned	delta_stop_minutes;	⁸
SE_Long_Float	delta_start_seconds;	⁹
SE_Long_Float	delta_stop_seconds;	¹⁰

Notes

Composed of Notes

If the <Relative Time Interval> instance R has an <Absolute Time> component, R is relative to the specified absolute time; otherwise, R is relative to the start time of the consuming application (i.e., simulation start time).

Fields Notes

time_significance

The time_significance field specifies the usage of the time information.

delta_start_days

The delta_start_days field specifies the starting whole day of the interval, relative to the specified time.

delta_stop_days

The delta_stop_days field specifies the stopping whole day of the interval, relative to the specified time.

delta_start_hours

The delta_start_hours field specifies the starting whole hour of the interval, relative to the specified time.

delta_stop_hours

The delta_stop_hours field specifies the stopping whole hour of the interval, relative to the specified time.

delta_start_minutes

The delta_start_minutes field specifies the starting whole minute of the interval, relative to the specified time.

delta_stop_minutes

The delta_stop_minutes field specifies the stopping whole minute of the interval, relative to the specified time.

delta_start_seconds

The delta_start_seconds field specifies the starting second of the interval, relative to the specified time.

delta_stop_seconds

The delta_stop_seconds field specifies the stopping second of the interval, relative to the specified time.

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Last updated: July 1, 2011