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GO::Model::Relationship.3pm

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