Attributes have simple types (one single value). The type of simple value must be stated. Typically, the type of an attribute is one of these:

Name	Description
String	A string with a max storable length
Text	A longer text of any size but not directly searchable
Integer	A number without decimals
Double	Any number
DateTime	Date and time
Boolean	Yes or No value
Blob	Binary data of any kind

Attributes can be nullable - they hold information that no value has been assigned. For integers, this means that there is a clear distinction between zero and nothing.

There are more settings on an attribute here.

To handle lists of values, use associations.

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