by toPDF(). Only use 
 this method to implement the serialization if the object can be fully 
 represented as text. If the PDF representation of the object contains
 binary content use toPDF() or output(OutputStream) instead. This applies
 to any object potentially containing a string object because string object
 are encrypted and therefore need to be binary.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/fop/pdf/PDFObject.html#toPDFString()">toPDFString</A></CODE> in class <CO