\XML(name)    <name\s*(.*?)>(...XML balanceado)</name>     $1 - att ; $2 - contents
\XML    <(\s+?)\s*(.*?)>(...XML balanceado)</name>         $1 - $q/$2 - att/$3 - contents

$xml1=mkxml(a);


$cbb = qr{\{ .*? \} }sx   ; ## curly brackets block { ... }    FIXME!!!
$bb  = qr{\[ .*? \] }sc    ; ##  FIXME!!!  [... ]

### XML

### LaTeX  

$texcom1=qr{\\(\w+)($bb)?($cbb)};                  ## \com[args]{contents}
$texcom2=qr{\\(\w+)($bb)?($cbb)($cbb)};            ## \com[args]{contents}{}
$texcom3=qr{\\(\w+)($bb)?($cbb)($cbb)($cbb)};      ## \com[args]{contents}{}{}
$texcom4=qr{\\(\w+)($bb)?($cbb)($cbb)($cbb)($cbb)};## \com[args]{contents}{}{}{}

$texenv =qr{\\begin\{(\w+)\}(.*?)\\end\{\1\}}s;
$texenv1=qr{\\begin\{(\w+)\}($bb)?($cbb)(.*?)\\end\{\1\}}s;
$texenv2=qr{\\begin\{(\w+)\}($bb)?($cbb)($cbb)(.*?)\\end\{\1\}}s;

RULES xml2tex

\XML(term)==>\\term{}{$3}
\XML(dic)==>\\begin{dic}$3\\end{dic}
\XML==>\\$1[$2]{$3}

ENDRULE

RULES balanced

\BALANCED

ENDRULED