(untested) another rough code sketch for how validating rdf types for Files within FileSets might work

rdf_type_validator.rb

# NOTE: class names, module names, and file paths will depend on which namespaces we decide to use.
# And the namespaces will depend on where we want them to live. There's no "right" answer for this.
# Just varying levels of "that makes sense" vs. "wtf?".

module Hyrax::Validations::FileRdfTypeValidation
  extend ActiveSupport::Concern
  included do
    validate :validate_pcdm_file_rdf_types
  end
  
  def validate_pcdm_file_rdf_types
    validates_with PcdmFileRdfTypeValidator
  end
end


class Hyrax::Validators::PcdmFileRdfTypeValidator
  
  def validate!()
    # Read validation rules from config
    # For each File within FileSet#files
    #  apply validation rules
  end
end

# And then.. we'd add our new module to default FileSetBehavior within Hyrax
module Hyrax::FileSetBehavior
  # this line is added
  include Hyrax::Validations::FileRdfTypeValidation
end

# Or something along those lines...