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The value of this keyword MUST be an integer. This integer MUST be greater than, or equal to, 0.
A string instance is valid against this keyword if its length is less than, or equal to, the value of this keyword.
The length of a string instance is defined as the number of its characters as defined by RFC 4627 [RFC4627].
Graphical Representation
The constraint is represented in line within the diagram, properties with the icon 
apply to instance string values.
Constraints are also shown in the property grid when the containing schema is selected.
If the schema is not allowed to contain a string value then constraint is ignored, and not shown in the property grid.
The constraint values are also shown on the tooltips (select and hover over an item in the diagram).
Editing
Its value can be edited in the following ways
- In place on the schema object by expanding the properties and clicking on it once it is already selected.
- Edited via the properties window when the containing schema is selected
- Edited directly in the Json Source view.
It can be deleted by selecting it and pressing delete, or right clicking it an pressing delete.