Class Name: Relative Time Interval

Superclass - <Time Interval>

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:

• 20

Secondary Pages in DRM Diagram:

Example

1. The time period for which a SEDRIS transmittal should be considered to be valid. The stop time can be considered to be an "expiration date".

FAQs

What is the purpose of this class?

This class provides a means to specify a time interval in terms of times relative to another time. The time interval is used to specify [CSDGM]-compliant metadata that describes the time period within which a high-level SEDRIS object (e.g. <Transmittal Root>, <Model>, <Image>, etc.) and as a general-purpose mechanism for describing time intervals. <Relative Time Interval> allows potential users of a SEDRIS transmittal to evaluate the time period covered by the transmittal or object, without necessarily having to actually obtain or examine the transmittal or object directly.

How do I specify a time interval relative to start of simulation?

Do not include the component <Absolute Time Point>. If there is no component <Absolute Time Point> then the deltas are relative to simulation start.

Constraints

• <<Legal Time Ranges>>
• <<Time Dependency>>
• <<Time Interval Calculation>>

Composed of (two-way)

• zero or one <Absolute Time Point> instance (notes)

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 <Month> instances
• zero or more <Season> instances
• zero or more <Sound Instance> instances
• zero or more <Source> instances

Inherited Field Elements

Field Elements

Notes

Composed of Notes

Absolute_Time_Point

 If present, the Time_Interval is relative to an absolute time
 Otherwise, the Time_Interval is relative to simulation start

Fields Notes

time_significance

 This indicates the significance of the time information.

delta_start_hours

 Shall be between 0 and 23

delta_stop_hours

 Shall be between 0 and 23

delta_start_minutes

 Shall be between 0 and 59

delta_stop_minutes

 Shall be between 0 and 59

delta_start_seconds

 Shall be between 0.0 and 59.0

delta_stop_seconds

 Shall be between 0.0 and 59.0