silverstripe-framework/ORM/Versioning/VersionableExtension.php

<?php

namespace SilverStripe\ORM\Versioning;

/**
 * Minimum level extra fields required by extensions that are versonable
 */
interface VersionableExtension {

	/**
	 * Determine if the given table is versionable
	 *
	 * @param string $table
	 * @return bool True if versioned tables should be built for the given suffix
	 */
	public function isVersionedTable($table);

	/**
	 * Update fields and indexes for the versonable suffix table
	 *
	 * @param string $suffix Table suffix being built
	 * @param array $fields List of fields in this model
	 * @param array $indexes List of indexes in this model
	 */
	public function updateVersionableFields($suffix, &$fields, &$indexes);
}