POSC Specifications: Epicentre Version 3.0 | Logical Data Model |
A set of adjacent grid elements, defined by two bounding elements, that are modified by another grid. This may be grid refinement (large cells replaced by small cells) or grid coarsening (small cells replaced by large cells).
- element_kind (M: ndt_element_type) (C137)
- The kind of element being used to delimit the refined portion of the target grid.
- first_element (M: ndt_pint4)
- The element of the target grid that is the lower bound of the portion being modified. For (i,j,k) in a 3D grid of (nx,ny,nz), the element is (i + (j-1)*ny + (k-1)*ny*nz).
- second_element (M: ndt_pint4)
- The element of the target grid that is the upper bound of the portion being modified. For (i,j,k) in a 3D grid of (nx,ny,nz), the element is (i + (j-1)*ny + (k-1)*ny*nz).
- source_grid (M: grid_structured(used_to_modify))
- Indicates the grid that is being used as the modification to the target grid. The source grid replaces the portion of the target grid designated by this modification. Each grid_modification must use one grid_structured.
- target_grid (M: grid_structured(modified_by))
- Indicates the grid for which this modification is created to modify. Each grid_modification must modify one grid_structured.
- description (O, I: ndt_comment) (C117)
- A remark or comment about the instance. Inherited from e_and_p_data.
- duration (O, I: ndt_time)
- Defines the duration of the association expressed in any valid units of time. Inherited from transient_association.
- end_time (O, I: ndt_date_tod)
- End time of the association. Inherited from transient_association.
- instance_create_date (O, I: ndt_date_tod) (C126)
- This is the date that this instance was created. This date is defined by the source if imported, or is the date the instance is created if a new instance. Inherited from e_and_p_data.
- instance_creator (O, I: ndt_identifier) (C126)
- This is the person, company or application that created this instance. This identifies the party responsible for loading this instance. Inherited from e_and_p_data.
- is_current (O, I: ndt_boolean) (C137)
- When TRUE, this flag indicates that this instance is designated as a current instance. This flag can be used in place of time based attributes or can be used in conjunction with them; however, it should not conflict with them. Inherited from transient_association.
- last_updated (O, I: ndt_date_tod) (C126)
- This is the date that this instance was last updated. This value should be updated when any part of this instance is altered (except for inverse relationships). Inherited from e_and_p_data.
- last_updated_by (O, I: ndt_identifier) (C126)
- This records the person or application making the update to this instance. Inherited from e_and_p_data.
- source (O, I: ndt_identifier) (C126)
- The provider of this instance, which is usually a data provider for imported/purchased data. If this instance is provided by POSC, then this attribute must be "POSC". Inherited from e_and_p_data.
- start_time (O, I: ndt_date_tod)
- Start time of the association. Inherited from transient_association.
- caused_by (O, I: activity(cause_association))
- Specifies the activity which establishes this association. Each grid_modification may be caused by one activity. Inherited from transient_association.
- data_collection (I, V: SET[0:?] data_collection_content(collection_part)) (C020)
- Indicates the data collections that include this instance of E and P data. Each grid_modification may be a member of one or more data_collection_content. Inherited from e_and_p_data.
- document_information_content (I, V: SET[0:?] document_information_content(e_and_p_data)) (C136)
- These are the document specification parts that include this data value and define its meaning within a document specification. Each use may define a different meaning, and many uses are allowed. Each grid_modification may be included in one or more document_information_content. Inherited from e_and_p_data.
- graphical_element (I, V: SET[0:?] graphical_element(depicted_object))
- Specifies one or more graphical elements which are depicting this data item. Each grid_modification may be depicted by one or more graphical_element. Inherited from e_and_p_data.
- ref_transient_period (O, I: ref_transient_period(transient_association)) (C138)
- The type of period over which the property applies, such as day, month, quarter, cumulative, etc. Each grid_modification may represent a period of one ref_transient_period. Inherited from transient_association.
- terminated_by (O, I: activity(terminate_association))
- Specifies the activity which established the termination of a transient association between two objects. Each grid_modification may be terminated by one activity. Inherited from transient_association.
Local rules:
- Abstract supertype:
- Each GRID_MODIFICATION must be instantiated as one of its subtypes. These subtypes are: grid_coarsening_modification, grid_refinement_modification
- [I: transient_association] Instance Value Constraint (C050)
-
If REF_TRANSIENT_PERIOD is either YEAR TO DATE, MONTH TO DATE or CUMULATIVE, then END_TIME must be instantiated.
- [I: transient_association] Instance Value Constraint (C050)
-
If REF_TRANSIENT_PERIOD is ANNUAL, SEMIANNUAL, QUARTER, MONTHLY, DAILY, or HOURLY, then either both START_TIME and END_TIME are blank or both must be instantiated.
- [I: transient_association] Instance Value Constraint (C050)
-
If REF_TRANSIENT_PERIOD is EVENT, then both START_TIME and END_TIME must either be blank or be identical.
- Different Related Instance
-
The GRID STRUCTURED used as the source grid must not be the GRID STRUCTURED used as the target grid.
Supertype path(s):
Referenced in Diagrams:
Generated on Tue Jul 10 15:43:16 2001
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