The data models describe the definitions or semantics of cadastral information. Entity relationship diagrams are a shorthand method for showing the associations among various objects and hence the definitional relationships of the objects. The diagram conventions for the entity relationship diagram in the Cadastral Data Content Standard are described in the following sections. All three are important to the semantic definition of the object in the standard. 2.1.1 Entities click here to make a comment A data entity is any object about which the organization chooses to collect data.
Attributes are additional information about the entity.
Entities and their attributes are defined in a data dictionary. Data entities are shown in boxes on the entity relationship diagram. In the Cadastral Data Content Standard the entity name is underlined and is the first item listed in the box. The entity attributes are listed below the entity name. The entities and their attributes are defined in Part 3 of the Standard.