diff --git a/l18n b/l18n
index 524eadb..64e2ae6 160000
--- a/l18n
+++ b/l18n
@@ -1 +1 @@
-Subproject commit 524eadbbd27906ae85911b758acd5af0d5534ac7
+Subproject commit 64e2ae642a90aa1ecee9cd17abde3a8cf55b54d9
diff --git a/src/enums/MDTagRelationType.php b/src/enums/MDTagRelationType.php
new file mode 100644
index 0000000..a323b93
--- /dev/null
+++ b/src/enums/MDTagRelationType.php
@@ -0,0 +1,170 @@
+<?PHP
+/**
+ * Represents a type of link between tag and object (e.g. the tag being the object
+ * type, a material used for creating the object, etc.).
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Represents a type of link between tag and object (e.g. the tag being the object
+ * type, a material used for creating the object, etc.).
+ */
+enum MDTagRelationType implements MDValueEnumInterface, JsonSerializable {
+
+    case tag;
+    case object_type;
+    case material;
+    case technique;
+
+    /**
+     * Returns a value of this type based on a string.
+     *
+     * @param string $input Input to get a value from.
+     *
+     * @return MDTagRelationType
+     */
+    public static function fromString(string $input):MDTagRelationType {
+
+        return match($input) {
+            'tag' => self::tag,
+            'object_type' => self::object_type,
+            'material' => self::material,
+            'technique' => self::technique,
+            default => throw new MDpageParameterNotFromListException("Unknown tag relation type"),
+        };
+
+    }
+
+    /**
+     * Returns a value of this type based on an integer.
+     *
+     * @param string $input Input to get a value from.
+     *
+     * @return MDTagRelationType
+     */
+    public static function fromInt(int $input):MDTagRelationType {
+
+        return match($input) {
+            0 => self::tag,
+            1 => self::object_type,
+            2 => self::material,
+            3 => self::technique,
+            default => throw new MDpageParameterNotFromListException("Unknown tag relation type"),
+        };
+
+    }
+
+    /**
+     * Returns the default status.
+     *
+     * @return MDTagRelationType
+     */
+    public static function getDefault():MDTagRelationType {
+
+        return self::tag;
+
+    }
+
+    /**
+     * Lists all available names.
+     *
+     * @return array<string>
+     */
+    public static function caseNames():array {
+
+        $output = [];
+
+        $cases = self::cases();
+        foreach ($cases as $case) {
+            $output[] = $case->name;
+        }
+
+        return $output;
+
+    }
+
+    /**
+     * Lists all available names.
+     *
+     * @return array<string>
+     */
+    public static function caseInts():array {
+
+        $output = [];
+
+        $cases = self::cases();
+        foreach ($cases as $case) {
+            $output[] = $case->toInt();
+        }
+
+        return $output;
+
+    }
+
+    /**
+     * Returns integer representation of tag relations.
+     *
+     * @return integer
+     */
+    public function toInt():int {
+
+        return match(self) {
+            self::tag => 0,
+            self::object_type => 1,
+            self::material => 2,
+            self::technique => 3,
+            default => throw new MDpageParameterNotFromListException("Unknown tag relation type"),
+        };
+
+    }
+
+    /**
+     * Gets an unsorted list of the entries in a translated version.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string, string>
+     */
+    public static function getUnsortedList(MDTlLoader $tlLoader):array {
+        return MDValueSet::getTlUnsortedList($tlLoader, self::caseNames(), "tag_relation_type", "tag_relation_type");
+
+    }
+
+    /**
+     * Gets a sorted list of the entries in a translated version.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string, string>
+     */
+    public static function getSortedList(MDTlLoader $tlLoader):array {
+        return MDValueSet::getTlSortedList($tlLoader, self::caseNames(), "tag_relation_type", "tag_relation_type");
+
+    }
+
+    /**
+     * Returns the name of the current value in translation.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return string
+     */
+    public function getTledName(MDTlLoader $tlLoader):string {
+
+        return $tlLoader->tl("tag_relation_type", "tag_relation_type", $this->name);
+
+    }
+
+    /**
+     * Provides the option to serialize as a string during json_encode().
+     *
+     * @return string
+     */
+    public function jsonSerialize():string {
+
+        return $this->name;
+
+    }
+}