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{foo is awesome and so is {bar}}

{foo is not {balanced}

{center foo}
||this is comment

|| an open brace looks like this {
{beginning of a block
{some function}
end of a block}

$text =~ s/\|\|(.*?)\n/\<\!\-\-$1\-\-\>\n/g; #turn line comment form i
+nto XML comment form
$text =~ s/<\!\-\-(.*?)\}(.*?)\-\->/<\!\-\-$1 endbrace $2\-\->/gxs; #e
+scape the end braces in comment so they needn't be balanced
$text =~ s/<\!\-\-(.*?)\{(.*?)\-\->/<\!\-\-$1 openbrace $2\-\->/gxs; #
+ditto for open braces

||{paragraph The union of zero or more  {glossary citation="type", typ
+es }
...
|| representational type } that can be used to  {glossary declare } a 
+ {glossary
|| variable } that can hold either an  {INT } or a  {FLOAT }. }

<!-- { paragraph The union of zero or more  <glossary citation="type",
+ types  } -->
...
<!-- representational type  }  that can be used to   { glossary declar
+e </glossary--> a  <glossary-->>
<!-- variable  }  that can hold either an   { INT </glossary--> or a  
+<FLOAT> </FLOAT>. > -->