// existing managed content
contentValidator.registerValidator(HASH, new ModelTypeValidator(ModelType.BYTES, true));
// existing unmanaged content
contentValidator.registerValidator(ARCHIVE, new ModelTypeValidator(ModelType.BOOLEAN, true));
contentValidator.registerValidator(PATH, new StringLengthValidator(1, true));
contentValidator.registerValidator(RELATIVE_TO, new ModelTypeValidator(ModelType.STRING, true));
// content additions
contentValidator.registerValidator(INPUT_STREAM_INDEX, new ModelTypeValidator(ModelType.INT, true));
contentValidator.registerValidator(BYTES, new ModelTypeValidator(ModelType.BYTES, true));
contentValidator.registerValidator(URL, new StringLengthValidator(1, true));
this.validator.registerValidator(CONTENT, chain(new ListValidator(new ParametersOfValidator(contentValidator)),