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+<?php
+
+/**
+ * @file classes/migration/install/MetadataMigration.php
+ *
+ * Copyright (c) 2014-2021 Simon Fraser University
+ * Copyright (c) 2000-2021 John Willinsky
+ * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
+ *
+ * @class MetadataMigration
+ *
+ * @brief Describe database table structures.
+ */
+
+namespace PKP\migration\install;
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class MetadataMigration extends \PKP\migration\Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        // Citations
+        Schema::create('citations', function (Blueprint $table) {
+            $table->comment('A citation made by an associated publication.');
+            $table->bigInteger('citation_id')->autoIncrement();
+
+            $table->bigInteger('publication_id');
+            $table->foreign('publication_id', 'citations_publication')->references('publication_id')->on('publications')->onDelete('cascade');
+            $table->index(['publication_id'], 'citations_publication');
+
+            $table->text('raw_citation');
+            $table->bigInteger('seq')->default(0);
+
+            $table->unique(['publication_id', 'seq'], 'citations_publication_seq');
+        });
+
+        // Citation settings
+        Schema::create('citation_settings', function (Blueprint $table) {
+            $table->comment('Additional data about citations, including localized content.');
+            $table->bigIncrements('citation_setting_id');
+            $table->bigInteger('citation_id');
+            $table->foreign('citation_id', 'citation_settings_citation_id')->references('citation_id')->on('citations')->onDelete('cascade');
+            $table->index(['citation_id'], 'citation_settings_citation_id');
+
+            $table->string('locale', 14)->default('');
+            $table->string('setting_name', 255);
+            $table->mediumText('setting_value')->nullable();
+            $table->string('setting_type', 6);
+
+            $table->unique(['citation_id', 'locale', 'setting_name'], 'citation_settings_unique');
+        });
+
+        // Filter groups
+        Schema::create('filter_groups', function (Blueprint $table) {
+            $table->comment('Filter groups are used to organized filters into named sets, which can be retrieved by the application for invocation.');
+            $table->bigInteger('filter_group_id')->autoIncrement();
+            $table->string('symbolic', 255)->nullable();
+            $table->string('display_name', 255)->nullable();
+            $table->string('description', 255)->nullable();
+            $table->string('input_type', 255)->nullable();
+            $table->string('output_type', 255)->nullable();
+            $table->unique(['symbolic'], 'filter_groups_symbolic');
+        });
+
+        // Configured filter instances (transformations)
+        Schema::create('filters', function (Blueprint $table) {
+            $table->comment('Filters represent a transformation of a supported piece of data from one form to another, such as a PHP object into an XML document.');
+            $table->bigInteger('filter_id')->autoIncrement();
+
+            $table->bigInteger('filter_group_id')->default(0);
+            $table->foreign('filter_group_id')->references('filter_group_id')->on('filter_groups')->onDelete('cascade');
+            $table->index(['filter_group_id'], 'filters_filter_group_id');
+
+            $table->bigInteger('context_id')->default(0);
+            $table->string('display_name', 255)->nullable();
+            $table->string('class_name', 255)->nullable();
+            $table->smallInteger('is_template')->default(0);
+            $table->bigInteger('parent_filter_id')->default(0);
+            $table->bigInteger('seq')->default(0);
+        });
+
+        // Filter Settings
+        Schema::create('filter_settings', function (Blueprint $table) {
+            $table->comment('More data about filters, including localized content.');
+            $table->bigIncrements('filter_setting_id');
+            $table->bigInteger('filter_id');
+            $table->foreign('filter_id')->references('filter_id')->on('filters')->onDelete('cascade');
+            $table->index(['filter_id'], 'filter_settings_id');
+
+            $table->string('locale', 14)->default('');
+            $table->string('setting_name', 255);
+            $table->mediumText('setting_value')->nullable();
+            $table->string('setting_type', 6);
+
+            $table->unique(['filter_id', 'locale', 'setting_name'], 'filter_settings_unique');
+        });
+    }
+
+    /**
+     * Reverse the migration.
+     */
+    public function down(): void
+    {
+        Schema::drop('filter_settings');
+        Schema::drop('filters');
+        Schema::drop('filter_groups');
+        Schema::drop('citation_settings');
+        Schema::drop('citations');
+    }
+}