Abstract Class Name: Time Point

Superclass - <Base Time Data>

Subclasses

• <Absolute Time>
• <Relative Time>

Definition

An instance of a concrete class derived from this DRM class specifies a point in time.

Primary Page in DRM Diagram:

• 20

Secondary Pages in DRM Diagram:

• 23

Example

See specific subclasses for examples.

FAQs

What is the purpose of this class?

This class provides 1) ISO 19115-compliant metadata that describes the point in time when a high-level SEDRIS object (e.g. <Transmittal Root>, <Model>, <Image>, etc.) was created, and 2) a general-purpose mechanism for describing points in time. It allows potential users of a SEDRIS transmittal to evaluate the age of a transmittal, without necessarily having to obtain or examine the transmittal itself.

When is <Relative Time> required vs. <Absolute Time>?

<Absolute Time> always represents a GMT time. <Relative Time Point> can be used to represent alternate time references, such as simulation time or Julian dates.

Constraints

• <<Publishable Object>>

Component of (two-way) (inherited)

• zero or more <Environment Root> instances
• zero or more <Time Constraints Data> instances
• zero or one <Transmittal Root> instance

Inherited Field Elements

Notes

Fields Notes

time_significance

 The time_significance field specifies the significance of
 the time information.