Self is a convenience function for Validate called at the ValidationLevelSelfOnly level and combining the resulting errors.

Validate performs validation checks on the provided descriptors, up to the specified level.

ImmutableRead is the default validation level when reading an immutable descriptor.

MutableRead is the default validation level when reading a mutable descriptor.

Write is the default validation level when writing a descriptor.

ValidationDereferencer is an interface to retrieve descriptors and namespace entries.