FOP-2348:fixing PDF file attachment extension; patch submitted by Matthias Reischenbacher

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1655097 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/java/org/apache/fop/render/pdf/extensions/PDFEmbeddedFileElement.java b/src/java/org/apache/fop/render/pdf/extensions/PDFEmbeddedFileElement.java
index 3fef552..f269987 100644
--- a/src/java/org/apache/fop/render/pdf/extensions/PDFEmbeddedFileElement.java
+++ b/src/java/org/apache/fop/render/pdf/extensions/PDFEmbeddedFileElement.java
@@ -30,6 +30,7 @@
 import org.apache.fop.fo.Constants;
 import org.apache.fop.fo.FONode;
 import org.apache.fop.fo.PropertyList;
+import org.apache.fop.fo.extensions.ExtensionAttachment;
 
 /**
  * Extension element for pdf:embedded-file.
@@ -97,4 +98,12 @@
     public String getLocalName() {
         return ELEMENT;
     }
+
+    /**
+     * Instantiates extension attachment object.
+     * @return extension attachment
+     */
+    protected ExtensionAttachment instantiateExtensionAttachment() {
+        return new PDFEmbeddedFileAttachment();
+    }
 }