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diff --git a/vala/valagenericsymbol.vala b/vala/valagenericsymbol.vala
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+/* valagenericsymbol.vala
+ *
+ * Copyright (C) 2023  Rico Tzschichholz
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ * 	Rico Tzschichholz <ricotz@ubuntu.com>
+ */
+
+using GLib;
+
+/**
+ * The interface for symbols which support type parameters.
+ */
+public interface Vala.GenericSymbol : Symbol {
+	/**
+	 * Appends the specified parameter to the list of type parameters.
+	 *
+	 * @param p a type parameter
+	 */
+	public abstract void add_type_parameter (TypeParameter p);
+
+	/**
+	 * Returns the type parameter list.
+	 *
+	 * @return list of type parameters
+	 */
+	public abstract unowned List<TypeParameter> get_type_parameters ();
+
+	/**
+	 * Returns whether this symbol has type parameters.
+	 *
+	 * @return true if there are type parameters
+	 */
+	public abstract bool has_type_parameters ();
+
+	/**
+	 * Returns the index of the type parameter with the given name.
+	 *
+	 * @return index of a type parameter, or -1
+	 */
+	public abstract int get_type_parameter_index (string name);
+}