ValidationVisitorInterface deprecated

Validates values against constraints defined in {@link MetadataInterface} instances.

This interface is an implementation of the Visitor design pattern. A value is validated by first passing it to the {@link validate} method. That method will determine the matching {@link MetadataInterface} for validating the value. It then calls the {@link MetadataInterface::accept} method of that metadata. accept() does two things:

1. It calls {@link visit} to validate the value against the constraints of the metadata.
2. It calls accept() on all nested metadata instances with the correspon
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