+struct_get_field_from_index(struct definition_struct *struct_definition,
+ unsigned long index);
+
+/*
+ * The tag enumeration is validated to ensure that it contains only mappings
+ * from numeric values to a single tag. Overlapping tag value ranges are
+ * therefore forbidden.
+ */
+struct declaration_untagged_variant *untagged_variant_declaration_new(const char *name,
+ struct declaration_scope *parent_scope);
+struct declaration_variant *variant_declaration_new(struct declaration_untagged_variant *untagged_variant,
+ const char *tag);
+
+void untagged_variant_declaration_add_field(struct declaration_untagged_variant *untagged_variant_declaration,
+ const char *field_name,
+ struct declaration *field_declaration);
+struct declaration_field *
+ untagged_variant_declaration_get_field_from_tag(struct declaration_untagged_variant *untagged_variant_declaration,
+ GQuark tag);
+/*
+ * Returns 0 on success, -EPERM on error.
+ */
+int variant_definition_set_tag(struct definition_variant *variant,
+ struct definition *enum_tag);
+/*
+ * Returns the field selected by the current tag value.
+ * field returned only valid as long as the variant structure is not appended
+ * to.
+ */
+struct field *variant_get_current_field(struct definition_variant *variant);
+
+/*
+ * elem_declaration passed as parameter now belongs to the array. No
+ * need to free it explicitly. "len" is the number of elements in the
+ * array.
+ */
+struct declaration_array *
+ array_declaration_new(const char *name,
+ size_t len, struct declaration *elem_declaration,
+ struct declaration_scope *parent_scope);