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diff --git a/src/formats/osxml/OsxmlAttributeLocator.hpp b/src/formats/osxml/OsxmlAttributeLocator.hpp
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+++ b/src/formats/osxml/OsxmlAttributeLocator.hpp
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+/*
+    Ousía
+    Copyright (C) 2014, 2015  Benjamin Paaßen, Andreas Stöckel
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file OsxmlAttributeLocator.hpp
+ *
+ * Contains a class used for locating the byte offsets of the attributes given
+ * in a XML tag.
+ *
+ * @author Andreas Stöckel (astoecke@techfak.uni-bielefeld.de)
+ */
+
+#ifndef _OUSIA_OSXML_ATTRIBUTE_LOCATOR_HPP_
+#define _OUSIA_OSXML_ATTRIBUTE_LOCATOR_HPP_
+
+#include <map>
+
+namespace ousia {
+
+// Forward declarations
+class CharReader;
+class SourceLocation;
+
+/**
+ * Class containing one static function for locating the byte offsets of the
+ * attributes in a XML tag. This are not retrieved by our xml parser, so we have
+ * to do this manually.
+ */
+class OsxmlAttributeLocator {
+public:
+	/**
+	 * Function used to reconstruct the location of the attributes of a XML tag
+	 * in the source code. This is necessary, as the xml parser only returns an
+	 * offset to the begining of a tag and not to the position of the individual
+	 * arguments.
+	 *
+	 * @param reader is the char reader from which the character data should be
+	 * read.
+	 * @param offs is a byte offset in the xml file pointing at the "<"
+	 * character of the tag.
+	 * @return a map from attribute keys to the corresponding location
+	 * (including range) of the atribute. Also contains the location of the
+	 * tagname in the form of the virtual attribute "$tag".
+	 */
+	static std::map<std::string, SourceLocation> locate(CharReader &reader,
+	                                                    size_t offs);
+};
+
+}
+
+#endif /* _OUSIA_OSXML_ATTRIBUTE_LOCATOR_HPP_ */
+