NAME¶
GO::Model::Relationship - relationship between two terms
SYNOPSIS¶
DESCRIPTION¶
a relationship between two GO::Model::Terms
relationships can be thought of as
statements or sentences of the form
SUBJECT-TERM PREDICATE OBJECT-TERM
for example,
"dog" IS_A "animal"
"G-Protein coupled receptor" IS_A "transmembrane receptor"
Statements have a
subject (i.e. the subject of the sentence/statement), a
predicate/relationship-type and an
object (i.e. the object of the
sentence/statement)
Relationships can also be seen as arcs in a directed graph, with the subject
being equivalent to the child, and the object equivalent to the parent. The
arc is labeled with the predicate/relationship-type.
A Relationship object currently does not contain an actual pointer to a
GO::Model::Term object. Instead it stores the ID of that term. This is
intended to be used in conjunction with the Graph object, or with the
database.
subject_acc¶
Title : subject_acc
Usage : $obj->subject_acc($newid)
Usage : $currid = $obj->subject_acc()
Synonyms: subj_acc, acc2, child_acc
Function: gets or sets the identifier for the child/subject term
Example :
Returns : value of subject_acc (string)
Args : on set, new value (string)
All Relationships can be thought of "subject-predicate-object"
statements. The statement is *about* the subject, and states something about
the relationship *to* the object.
For example, the if we have a Relationship:
cell
^
|
| [part_of]
|
cell nucleus
This is a statement about cell nuclei in general, so "cell nucleus" is
the subject (sometimes called the child node). The Relationship tells us that
all cell nuclei are part_of some cell, so the object of the relationship
(sometimes called the parent node) is "cell"
object_acc¶
Title : object_acc
Usage : $obj->object_acc($newid)
Usage : $currid = $obj->object_acc()
Synonyms: obj_acc, acc1, parent_acc
Function: gets or sets the identifier for the parent/object term
Example :
Returns : value of object_acc (string)
Args : on set, new value (string)
See Also: subj_acc
type¶
Title : type
Usage : $obj->type($newval)
Usage : $currval = $obj->type()
Synonyms:
Function: gets or sets the relationship type (a string)
Example :
Returns : value of type (string)
Args : on set, new value (string)
Currently any string is allowed; in future the type string may be constrained to
come from a controlled vocabulary of relationship types