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Model building blocks
Describers
These can be attached to basic objects to describe them. A describer is something that describes any kind of basic object.
Attribute
An attribute is something that describes a thing, substance or process, without using any numbers or amounts. Example: Eye color is an attribute for a person.
State or form
This is a special kind of describer. Generally something is in one state, then another, but isn't in two states at the same time. For example water can be in the form steam or the form ice, but not both at the same time. A person can be in the state sleeping or the state awake, but not both.