ISO/IEC 18023-1:200x(E) — Table 6.220 DRM_Relative

Table 6.220 — DRM_Relative_Time

Property

Description

Class

<DRM Relative Time>

Superclass

<DRM Time Point>

Subclass

None.

Definition

An instance of this DRM class specifies a date and time relative to either a specified <DRM Absolute Time> instance or (if a <DRM Absolute Time> instance is not specified) relative to the simulation start time.

The delta_days field specifies the number of whole days relative to the specified time.

The delta_hours field specifies the number of whole hours relative to the specified time, after delta_days has been taken into account.

The delta_minutes field specifies the number of whole minutes relative to the specified time, after delta_days and delta_hours have been taken into account.

The delta_seconds field specifies the remaining seconds relative to the specified time. Fractions provide sub-second accuracy, if needed.

Class diagram

Figure 6.274 — DRM_Relative_Time

Inherited field elements

Field name	Range	Field data type
time_significance		Time_Significance

Field elements

Field name	Range	Field data type
delta_days		Integer
delta_hours	[0..23]	Byte_Unsigned
delta_minutes	[0..59]	Byte_Unsigned
delta_seconds	[0,0, 61,0]	Long_Float

Default field values

Default field values for DRM_Relative_Time

Associated to (one-way) (inherited)

None.

Associated to (one-way)

None.

Associated by (one-way) (inherited)

None.

Associated by (one-way)

None.

Associated with (two-way) (inherited)

None.

Associated with (two-way)

None.

Composed of (two-way) (inherited)

None.

Composed of (two-way)

zero or one <DRM Absolute Time> instance

Composed of (two-way metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

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

Component of (two-way)

None.

Constraints

Clarifications

None.

Example(s)

The date/time is an astronomical Julian day of 2449143.77083 (June 5, 1993 0630Z). Astronomical Julian dates are referenced to 1 January 4712 BCE at 12Z. Since the fractional days are converted to hours, minutes and seconds, the fields in the <DRM Relative Time> instance are set as follows.

delta_days	2449143
delta_hours	18
delta_minutes	30
delta_seconds	0,0

The fields in the <DRM Absolute Time> component are set as follows.

time_value.configuration	DATE_YMD_AND_TIME_H
time_value.value. ymd_h.year	-4712
time_value.value. ymd_h.month	JANUARY
time_value.value.ymd_h.day	1
time_value.value.ymd_h.hour	12

The time is 6 hours 25 minutes and 30 seconds after the start of the simulation. The fields of the <DRM Relative Time> instance are set as follows.

delta_days 0

delta_hours 6

delta_minutes 25

delta_seconds 30,0
A DRM object becomes active 20 minutes after the simulation starts. That is, its activation time is expressed in simulation time (relative to the start of the simulation), so the activation time is specified using a <DRM Relative Time> instance. The time_significance field is set to OCCURRENCE.