Boolean
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A boolean is a binary value, indicating either a "true" or a "false".
In general, only a value of 0 or 1 is allowed. Any other value may cause undefined behavior, though as a rule of thumb any positive value is interpreted as "true".
| Value | Meaning |
|---|---|
| 0 | False (No) |
| 1 | True (Yes) |
Presence
For some functionalities, the presence of an attribute is used, rather than the actual value of that attribute. This is referred to as a "boolean by presence". In these cases, if the attribute is not present, it's considered a logical "False". If the attribute is present, it's considered a logical "True".