terface <CODE><A HREF="../../../../org/apache/fop/complexscripts/fonts/Substitutable.html" title="interface in org.apache.fop.complexscripts.fonts">Substitutable</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if performs substitution.</DL>
</DD>
</DL>
<HR>

<A NAME="performSubstitution(java.lang.CharSequence, java.lang.String, java.lang.String)"><!-- --></A><H3>
performSubstitution</H3>
<PRE>
public java.lang.CharSequence <B>performSubstitution</B>(java.lang.CharSequence&nbsp;cs,
              