The item_related category describes specific relationships
that exist between data items. These relationships are distinct
from the parent-child relationships that are expressed in the
item_linked category (Section 
).
The related item is identified
as _item_related.related_name which is a child of
_item.name.
The item relationships defined by _item_related.function_code
in this category include some of the following:
an item is related to another item by conversion factor;
an item is a replacement for another item, an item is replaced
by another item, an item is an alternative
expression of an item; items which differ only in some convention
of their expression; and items which express a set of related
characteristics. One can also identify that the declaration of
an item is mutually exclusive with its alternative item.
Multiple related items can be associated with
each data item, and multiple relationship codes can be specified
for each related item.
The DDL for the item_related category is given in the following section.
save_ITEM_RELATED
_category.description
;
Attributes which specify recognized relationships between data items.
;
_category.id item_related
_category.mandatory_code no
loop_
_category_key.name '_item_related.name'
'_item_related.related_name'
'_item_related.function_code'
loop_
_category_group.id 'ddl_group'
'item_group'
save_
save__item_related.related_name
_item_description.description
;
Identifies a data item by name which is closely related to the
defined data item by the manner described by _item_related.function_code
;
save_
save__item_related.function_code
_item_description.description
;
The code for the type of relationship of the item identified by
_item_related.name and the defined item.
ALTERNATE indicates that the item identified in
_item_related.related_name is an alternative expression in terms
of its application and attributes to the item in this definition.
ALTERNATE_EXCLUSIVE indicates that the item identified in
_item_related.related_name is an alternative expression in terms
of its application and attributes to the item in this definition.
Only one of the alternative forms may be specified.
CONVENTION indicates that the item identified in
_item_related.related_name differs from the defined item only
in terms of a convention in its expression.
CONVERSION_CONSTANT indicates that the item identified in
_item_related.related_name differs from the defined item only
by a known constant.
CONVERSION_ARBITRARY indicates that the item identified in
_item_related.related_name differs from the defined item only
by a arbitrary constant.
REPLACES indicates that the defined item replaces the item identified
in _item_related.related_name.
REPLACEDBY indicates that the defined item is replaced by the
item identified in _item_related.related_name.
ASSOCIATED_VALUE indicates that the item identified in
_item_related.related_name is meaningful when associated with the
defined item.
ASSOCIATED_ESD indicates that the item identified in
_item_related.related_name is the estimated standard deviation of
of the defined item.
;
_item.name '_item_related.function_code'
_item.category_id item_related
_item.mandatory_code yes
_item_type.code code
loop_
_item_enumeration.value
_item_enumeration.detail
alternate 'alternate form of the item'
alternate_exclusive 'mutually exclusive alternate form of the item'
convention 'depends on defined convention'
conversion_constant 'related by a known conversion factor'
conversion_arbitrary 'related by a arbitrary conversion factor'
replaces 'a replacement definition'
replacedby 'an obsolete definition'
associated_value 'a meaningful value when related to the item'
associated_esd 'an estimated standard deviation of the item'
save_