+struct definition *variant_get_current_field(struct definition_variant *variant);
+int variant_rw(struct stream_pos *pos, struct definition *definition);
+
+/*
+ * 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(size_t len, struct declaration *elem_declaration,
+ struct declaration_scope *parent_scope);
+uint64_t array_len(struct definition_array *array);
+struct definition *array_index(struct definition_array *array, uint64_t i);
+int array_rw(struct stream_pos *pos, struct definition *definition);
+GString *get_char_array(const struct definition *field);
+int get_array_len(const struct definition *field);
+
+/*
+ * int_declaration and elem_declaration passed as parameter now belong
+ * to the sequence. No need to free them explicitly.
+ */
+struct declaration_sequence *
+ sequence_declaration_new(const char *length_name,
+ struct declaration *elem_declaration,
+ struct declaration_scope *parent_scope);
+uint64_t sequence_len(struct definition_sequence *sequence);
+struct definition *sequence_index(struct definition_sequence *sequence, uint64_t i);
+int sequence_rw(struct stream_pos *pos, struct definition *definition);