{
// We must look in the <extend/> element for expressions that may be present as
//
// <extend>../project.xml</extend>
Expression e = JellyUtils.decomposeExpression( pomToExtend, context );
pomToExtend = e.evaluateAsString( context );
pomToExtend = MavenUtils.makeAbsolutePath( projectDescriptor.getParentFile(), pomToExtend );
project.setExtend( pomToExtend );
File parentPom = new File( pomToExtend );
parentPom = parentPom.getCanonicalFile();