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Logical classifications

Logical classifications combine other classifications to produce a single true or false result.

They are used when a condition depends on multiple things being true or false at the same time.

Examples:

  • A customer is eligible for booking only if they are active and have a valid contract.
  • A room is available if it is not under maintenance and not already booked.
  • A task is ready to start if all prerequisites are complete.

Logical classifications make it possible to build larger rules from smaller ones.

What a logical classification is

A logical classification is a named condition that combines other classifications.

Instead of checking a column directly, it references existing classifications and combines their results.

Example:

Table: Customer

Existing classifications:

  • Active customer
  • Has valid contract

Logical classification:

Active customer AND Has valid contract

Result:

Customer Active customer Has valid contract Eligible customer
Anna true true true
Erik true false false
Maria false true false

The logical classification does not change the data.
It simply combines the results of other classifications.

Boolean operators

Logical classifications use standard boolean operators.

AND

All referenced classifications must be true.

Example:

Active customer AND Has valid contract

The result is true only if both conditions are true.

OR

At least one referenced classification must be true.

Example:

VIP customer OR Premium subscription

The result is true if either condition is true.

NOT

Reverses the result of another classification.

Example:

NOT Account suspended

If Account suspended is true, the result becomes false.

Combining multiple classifications

Logical classifications can combine several conditions.

Example:

Active customer
AND Has valid contract
AND NOT Payment overdue

Result:

Customer Active Contract Payment overdue Allowed booking
Anna true true false true
Erik true true true false

This makes it easy to express real business rules clearly.

Reusing classifications

Logical classifications are often used to reuse existing logic.

Instead of repeating the same conditions everywhere, the system defines them once and combines them when needed.

Example structure:

Active customer
Has valid contract
Payment overdue
↓
Logical classification:
Customer allowed to book

If any underlying classification changes, the logical classification updates automatically.

A simple way to think about logical classifications

A logical classification answers a question like:

When several conditions exist, what combination should count as true?

By combining smaller classifications, the system can express complex rules while keeping each individual classification simple.

Reference

How-to

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