Read the summary and the most important questions on Geodata models

• 1 UML

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• What is the purpose of UML class diagram?

  To give basis to read ISO191xx and INSPIRE UML class diagrams

• What are the notions of UML class diagram?

  Class, Attribute, Operation, Association, Constraint, Package, Stereotype

• What is an Object Class?

  Description of a set of objects with similar properties (attributes, operations, relationships, constraints, and semantics)
  
  Example: Car (is the class), colour (object)

• What is a Class attribute?

  Characteristic common to all the objects of a class
  
  Example: city: String = "Den Haag"
  Class is defined = student 
  Attribute name = city
  Admissible values = string
  Optional: default value = Den Haag

• What is a Class operation?

  An operation (or method) is a serve that can be requested from an object. Objects in a class share the same operations.

• What are associations with specific semantics?

  Generalization ("is a")
  Aggregation ("part of")
  
  Semantics of the association are defined through argument typing, multiplicity and (implicitly) the name of the association.

• What is generalization of a class?

  Purpose: sharing similarities while preserving differences I
  
  Is an association between a class that acts as super-class and one or more classes called the sub-classes

• What is Aggregation relationship?

  Aggregation relationship between instances of a class and several instances of another class, is an association where you can say has an à A country has 0 or more regions, a region belongs to one country
  
  
   

• What is Composition relationship?

  Composition relationship between instances of a class and several instances of another class (they cannot exist independently)
  Difference is that in composition is that if you if the separate parts are useless (book), or with association the two parts are useful apart.
  
  

• What is Navigability relationship?

  Indication on the navigation supported by an association (note more implementation level, than conceptual model level)