Table 6.5—DRM_Absolute_Time_Point

Property

Description

Superclass

· <DRM Time Point>

Class

· <DRM Absolute Time Point>

Subclass

· none

Definition

This class is used to specify absolute time (that is, Greenwich Mean Time (GMT), which is not relative to some other point in time).

<DRM Absolute Time Point> provides:

a. a means to specify an absolute time (GMT) for ISO 19115.2-compatible metadata (see 2.[I19115.2]), and

b. a general-purpose mechanism for describing points in absolute (GMT) time.

Example(s)

· Consider a SEDRIS transmittal constructed from a historical database, in which the time at which an event happened is recorded as Oct 3 17:56:47 GMT 1994. In the SEDRIS transmittal, this information is specified by an <DRM Absolute Time Point> instance with time_significance = OCCURRENCE, as follows.

time_significance	=	OCCURRENCE
configuration	=	DATE_YMD_AND_TIME_HMS
year	=	1994
month	=	OCTOBER
day	=	3
hour	=	17
minutes	=	56
seconds	=	47.0

· Consider a SEDRIS transmittal for which the data provider wishes to represent the date and time when the transmittal was created - in this example, Mar 23 15:18:33 GMT 2003. In this case, the data provider would create an <DRM Absolute Time Point> instance with time_significance = CREATION_DATE and the other field values set appropriately, as follows.

time_significance	=	CREATION_DATE
configuration	=	DATE_YMD_AND_TIME_HMS
year	=	2003
month	=	MARCH
day	=	23
hour	=	15
minutes	=	18
seconds	=	33.0

· This <DRM Absolute Time Point> instance would then be attached as a component of the transmittal's <DRM Transmittal Root>.

· Consider a SEDRIS transmittal for which the data provider wishes to represent the date and time when an observation was made - in this example, May 26 17:32:57 GMT 2003. In this case, the data provider would create an <DRM Absolute Time Point> instance with time_significance = OBSERVATION and the other field values set appropriately, as follows.

time_significance	=	OBSERVATION
configuration	=	DATE_YMD_AND_TIME_HMS
year	=	2003
month	=	MAY
day	=	26
hour	=	17
minutes	=	32
seconds	=	57.0

Inherited field elements

field_name	range	Field_Data_Type
time_significance^1		Time_Significance

Field elements

field_name	range	Field_Data_Type
configuration		Time_Configuration
year		Integer
month		Month
day		Integer
hour^2	0..23	Unsigned_Byte
minutes^3	0..59	Unsigned_Byte
seconds^4	[0, 60)	Long_Float

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)

· none

Composed of (two-way metadata) (inherited)

· none

Composed of (two-way metadata)

· none

Component of (inherited)

· zero or more <DRM Environment Root>s

· zero or more <DRM Time Constraints Data>s

· zero or one <DRM Transmittal Root>

Component of

· zero or more <DRM Absolute Time Interval>s

· zero or more <DRM Citation>s

· zero or more <DRM Process>s

· zero or more <DRM Relative Time Interval>s

· zero or more <DRM Relative Time Point>s

Constraints

· Legal Time Ranges

Notes

¹Used to indicate the significance of the time information.

²Use 24 hour clock for hour.  The value shall be between -1 and 23, where a value of -1 indicates not applicable.

³The value shall be between -1 and 59, where a value of -1 indicates not applicable.

⁴Fractions provide higher accuracy if needed (e.g. milliseconds); -1 indicates not applicable. This is the only valid negative value.

Class diagram

<DRM Absolute Time Point>