Specialization rules for attributes
There are certain rules that apply to attribute specializations.
A specialized attribute has the following characteristics:
• It is specialized from props or base.
• It is declared as a global attribute. Attribute specializations cannot be limited to specific element types.
• It does not have values or value ranges that are more extensive than those of the attribute from which it was specialized.
• Its values must be alphanumeric space-delimited values. In generalized form, the values must conform to the rules for attribute generalization.
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