OptionalcopyIndicates that given text attribute should be copied from an inline object to the next inserted inline content.
OptionalcopyIndicates that given text attribute should be copied to the next block when enter is pressed.
OptionalcopyIndicates that given attribute should be preserved while replacing the element.
OptionalisIndicates that the attribute should be considered as a visual formatting, like bold, italic or
fontSize rather than semantic attribute (such as src, listType, etc.). For example, it is used by the "Remove format" feature.
A structure containing additional metadata describing the attribute.
See module:engine/model/schema~ModelSchema#setAttributeProperties
Schema#setAttributeProperties()for usage examples.