In Visum, network objects have many attributes you can save your input or output data to. Generally, there are two types of attributes:
- Direct attributes
- Indirect attributes
Direct attributes contain data that refer directly to a network object, e.g. the length or volume of a link (Direct attributes).
Indirect attributes refer to the relations between one network object and other network objects. E.g. the sum of volumes of all outgoing links is an indirect attribute of a node (Indirect attributes).
The number of attributes available in Visum is not static, but can be extended by user-defined attributes (User-defined attributes).
Time-varying attributes play a special role in dynamic assignments (Time-varying attributes).
A list of all attributes - except time-varying attributes - can be found in the program in the Lists menu. In addition to the ID, short name and long name, the list contains other attribute properties that are essential for their use or creation. In addition to serving as an overview, the list offers options for duplicating attributes, i.e. you can generate user-defined attributes based on predefined Visum attributes (User-defined attributes). The user-defined attributes can then be copied across network object types. In general, the list allows you to create and delete user-defined attributes.
