Legend

Single values (like Opacity of object which is measured in percentages) are denoted by their type like:

Opacity: decimal% in [0 .. 100]

Values which can accept just certain number range (like Count in Repeat which is an integer greater than 0) are denoted by range restrictions written after their names listed with their types like:

Count: integer > 0

If range in a specific range (inclusive or exclusive) we use something like:

PropertyName: integer in [2 .. 53].

Values which are groups of named sub-properties (like Size in Blur which consist of Width and Height sub-values) are denoted by list of properties with their types inside them like:

Width: decimal px > 0
Height: decimal px > 0

Values which are sequences (like Handles in Perspective Deform which is a group of points) are denoted by array of followed by indented item type description:

Handles array of 4 items:
X: decimal%
Y: decimal%

If we know that the number of such values is limited we write a specific number like above, otherwise put nothing between square brackets like in Puppet Deform.

Simpler example:

Position: array of 3 decimal px

It means that handle which we are dealing with is subject to Snapping settings and takes them into account when being placed. A good examples of it is a path handle which can be snapped to scene, for instance when Snapping to Scene is enabled.

It means that the value is a group of 2 or more values like Size and can maintain proportions during any of its values modification.