protected String specialXObjectDictEntries() {
final BoundingBox boundingBox = this.getBoundingBox();
final float llx = boundingBox.lowerLeftX();
final float lly = boundingBox.lowerLeftY();
final float urx = boundingBox.upperRightX();
final float ury = boundingBox.upperRightY();
final StringBuilder buffer = new StringBuilder();
buffer.append("/FormType 1" + EOL);
buffer.append("/BBox [");
buffer.append(llx + " ");
buffer.append(lly + " ");