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diff --git a/libvaladoc/importer/internalidregistrar.vala b/libvaladoc/importer/internalidregistrar.vala
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+++ b/libvaladoc/importer/internalidregistrar.vala
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+/* gtkdocindexsgmlreader.vala
+ *
+ * Copyright (C) 2014  Florian Brosch
+ *
+ * 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:
+ *  Florian Brosch <flo.brosch@gmail.com>
+ */
+
+using Valadoc;
+using Gee;
+
+
+public class Valadoc.Importer.InternalIdRegistrar {
+	private HashMap<string, Api.Node> symbol_map;
+	private HashMap<string, string> map;
+
+
+	public InternalIdRegistrar () {
+		map = new HashMap<string, string> ();
+		symbol_map = new HashMap<string, Api.Node> ();
+	}
+
+	
+	public void register_symbol (string id, Api.Node symbol) {
+		this.symbol_map.set (id, symbol);
+	}
+
+	public string? map_url_id (string id) {
+		return map.get (id);
+	}
+
+	public Api.Node? map_symbol_id (string id) {
+		return symbol_map.get (id);
+	}
+
+
+	public void read_index_sgml_file (string filename, string? index_sgml_online, ErrorReporter reporter) {
+		MarkupSourceLocation begin;
+		MarkupSourceLocation end;
+		MarkupTokenType token;
+
+		string base_path = index_sgml_online ?? realpath (filename);
+		var reader = new MarkupReader (filename, reporter);
+
+		while ((token = reader.read_token (out begin, out end)) != MarkupTokenType.EOF) {
+			if (token == MarkupTokenType.START_ELEMENT && reader.name == "ONLINE") {
+				if (index_sgml_online == null) {
+					base_path = reader.get_attribute ("href");
+					if (base_path == null) {
+						reporter.error (filename, begin.line, begin.column, end.column, reader.get_line_content (begin.line), "missing attribute `href' in <ONLINE>");
+					}
+				}
+			} else if (token == MarkupTokenType.START_ELEMENT && reader.name == "ANCHOR") {
+				string id = reader.get_attribute ("id");
+				if (id == null) {
+					reporter.error (filename, begin.line, begin.column, end.column, reader.get_line_content (begin.line), "missing attribute `id' in <ANCHOR>");
+				}
+
+				string href = reader.get_attribute ("href");
+				if (href == null) {
+					reporter.error (filename, begin.line, begin.column, end.column, reader.get_line_content (begin.line), "missing attribute `href' in <ANCHOR>");
+				} else if (index_sgml_online != null) {
+					href = Path.get_basename (href);
+				}
+
+				map.set (id, Path.build_path ("/", base_path, href));
+			} else {
+				reporter.error (filename, begin.line, begin.column, end.column, reader.get_line_content (begin.line), "expected element of <ONLINE> or <ANCHOR>");
+			}
+		}
+	}
+}
+
+