Oxygen not required

Doc/lectures.xpr

-<?xml version="1.0" encoding="UTF-8"?>
-<project version="21.0">
-    <meta>
-        <filters directoryPatterns="" filePatterns="\Qlectures.xpr\E" positiveFilePatterns="" showHiddenFiles="false"/>
-        <options>
-            <serialized version="21.0" xml:space="preserve">
-                <serializableOrderedMap>
-                    <entry>
-                        <String>enable.project.master.files.support</String>
-                        <Boolean>true</Boolean>
-                    </entry>
-                </serializableOrderedMap>
-            </serialized>
-        </options>
-    </meta>
-    <projectTree name="lectures.xpr">
-        <folder masterFiles="true" name="Master Files">
-            <file name="lectures.xml"/>
-        </folder>
-        <folder path="."/>
-    </projectTree>
-</project>
\ No newline at end of file