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=head3  <%= _a_perl_expression_ %>

     evaluates the perl expression, and the block gets replaced by 
     the expression's value.

     '<%+ %>' is the same as '<%= %>', but the output gets url-encoded.
     (mnemonic: '+' is a space in a url-encoded string.)

     '<%^ %>'is the same as '<%= %>', but the output gets html-escaped.
     (mnemonic: '^' looks like the '<' and '>' that get replaced.)

     '<%\ %>'is the same as '<%= %>', except the string gets escaped for
     use as a single-quoted javascript var. ("'", "\", NL, CR get escaped.)

=head3  <%- _a_comment_ %>

     is ignored and replace by nothing.
     (mnemonic: "-" as in "<!-- html comments -->".)

=head3  <%# _comment_out_text_and/or_template_blocks_ #%>