### Define derived role using OCL

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/FreeRole/index.html

Use this OCL expression to set a free role as derived based on specific conditions.

```OCL
context FreeRole-1 :: allInstances() : Set(FreeRole-1)
derive : DefinedRole.allInstances()- >select( x | <CONDITION>)
```

--------------------------------

### Define OCL derivation rule for Formal relation

Source: https://ontouml.readthedocs.io/en/latest/relationships/formal/index.html

Use this OCL rule to specify how a formal relation is derived based on the comparison of quality values.

```OCL
context Person::lighter : Set(Person)
derive : Person.allInstances()->select(x | self.weight > x.weight)
```

--------------------------------

### OCL template for implicit rigid subtype derivation

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/HetColl/index.html

Use this OCL template during refactoring to define a new rigid subtype derived from the negation of existing rigid subtypes.

```OCL
context NewRigid::allInstances() : Set(NewRigid)
derive : RigidParent.allInstances()- >select( x | not(x.oclIsTypeOf(Rigid_1 _) or
x.oclsIsTypeOf(Rigid_ 2 _) or … or x.oclIsTypeOf(Rigid_ n _))
```

--------------------------------

### OCL Left Universal Composition Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelComp/index.html

Enforces that type B has a left universal composition to type A.

```OCL
context BSource
inv: self.bTarget->asSet()->forAll( y |
ASource.allInstances()->forAll( z |
z.aTarget->asSet()->contains(y) implies
z.aTarget->asSet()->contains(self))
```

--------------------------------

### OCL Right Universal Composition Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelComp/index.html

Enforces that type B has a right universal composition to type A.

```OCL
context BSource
inv: self.bTarget->asSet()->forAll( y |
ASource.allInstances()->forAll( z |
z.aTarget->asSet()->contains(self) implies
z.aTarget->asSet()->contains(y))
```

--------------------------------

### Define Redefine Constraint in OCL

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelSpec/index.html

Use this OCL invariant when all elements related through A must also be related through B.

```OCL
context BSource
inv subset : self.oclAsType(ASource).aTarget=self.bTarget.oclAsType(ATarget)
```

--------------------------------

### Define Uniqueness Constraint (Current Relator)

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RepRel/index.html

OCL invariant to limit the number of coexistent relator instances that mediate the same combination of types.

```OCL
context Relator
inv: Relator.allInstances()- >select( r | r <> self and
r.type1 = self.type1 and r.type2=self.type2)- >size() = <n-1>
```

--------------------------------

### Define Subset Constraint in OCL

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelSpec/index.html

Use this OCL invariant when being connected through relation B implies being connected through relation A.

```OCL
context BSource
inv subset : self.oclAsType(ASource).aTarget- >includesAll(self.bTarget.oclAsType(ATarget)
```

--------------------------------

### Enforce Multiplicity Constraint with OCL

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/ImpAbs/index.html

Use this OCL invariant to restrict the number of instances of a specific subtype that a source class instance can be connected to.

```OCL
context Source
inv: let sub1Size = self.target->select( x |
x.oclIsTypeOf('Target Subtype-1'))->size()
in sub1Size >= min1 and sub1Size <= max1
```

--------------------------------

### OCL Custom Existential Composition Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelComp/index.html

Enforces that type B has a custom existential composition to type A with a specific cardinality constraint.

```OCL
context BSource
inv: self.bTarget->asSet()->forAll( y |
ASource.allInstances()->select( z |
z.aTarget->asSet()->contains(y) and
z.aTarget->asSet()->contains(self))->size()[>|<|=]n)
```

--------------------------------

### OCL Exclusiveness Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelOver/index.html

Use this OCL template to enforce that an individual cannot play multiple roles with respect to the same relator instance.

```OCL
context Relator
inv: self.over1.oclAsType(Supertype)- >asSet()->excludesAll(
self.over2.oclAsType(Agent)- >asSet() and
self.over1.oclAsType(Supertype)- >asSet()->excludesAll(
self.over3.oclAsType(Agent)- >asSet() and
self.over2.oclAsType(Supertype)- >asSet()->excludesAll(
self.over3.oclAsType(Agent)- >asSet()))
```

--------------------------------

### Define OCL Derivation for Intersection

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/DecInt/index.html

Use this OCL constraint to specify that the extension of a type is derived by the intersection of the extensions of two or more concrete parents.

```OCL
context Parent1
inv: (self.oclIsTypeOf(Parent2) and self.oclIsTypeOf(Parent2))
implies self.oclIsTypeOf(Type)
```

--------------------------------

### Define Uniqueness Constraint (Historical Relator)

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RepRel/index.html

OCL invariant and helper function to limit the number of concurrent relator instances over time.

```OCL
context Relator
inv: Relator.allInstances()- >select( r | r<>self and r.type1=self.type1
and r.type2=self.type2 and concurrent(self,r))- > size()=<n-1>

context Relator::concurrent(r:Relator):Boolean
body: self.start = r.start or (self.start <r.start and r.start<self.end)
or (r.start <self.start and self.start<self.end)
```

--------------------------------

### OCL Existential Composition Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelComp/index.html

Enforces that type B has an existential composition to type A.

```OCL
context BSource
inv: self.bTarget->asSet()->forAll( y |
ASource.allInstances()->exists( z |
z.aTarget->asSet()->contains(self) and
z.aTarget->asSet()->contains(y))
```

--------------------------------

### Define Disjoint Constraint in OCL

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelSpec/index.html

Use this OCL invariant when being related through B implies not being related through A.

```OCL
context BSource
inv subset : self.oclAsType(ASource).aTarget- >excludesAll( self.bTarget.oclAsType(ATarget)
```

--------------------------------

### OCL Exclusiveness Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/PartOver/index.html

An OCL invariant template used to forbid an individual from playing multiple roles with respect to the same part instance.

```OCL
context Part
inv: self.over1.oclAsType(Supertype)->asSet()->excludesAll(
self.over2.oclAsType(Agent)->asSet() and
self.over1.oclAsType(Supertype)->asSet()->excludesAll(
self.over3.oclAsType(Agent)->asSet() and
self.over2.oclAsType(Supertype)->asSet()->excludesAll(
self.over3.oclAsType(Agent)->asSet())
```

--------------------------------

### OCL Forbidden Composition Invariant

Source: https://ontouml.readthedocs.io/en/latest/anti-patterns/RelComp/index.html

Enforces that type B has a forbidden composition to type A.

```OCL
context BSource
inv: self.bTarget->asSet()->forAll( y |
ASource.allInstances()->forAll( z |
not(z.aTarget->asSet()->contains(y) and
z.aTarget->asSet()->contains(self)))
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.