[PHP] trouble parsing an XML document

[alfredo]

Hello,
I'm trying to parse a XML doc, but the doc has some tags like:
<REG-ORIG>
so when I try to initialize variables:

class Documenti {
        var $FILE; //nomefile
        var $NUMERO; //numerodiserie
        var ${'REG-ORIG'}; // here is the broblem
    function Documenti($aa) {
        foreach ($aa as $k=>$v)
            $this->$k = $aa[$k];
    }
i have an error:
Parse error: parse error, unexpected '$', expecting T_VARIABLE...
I tryed changing the $ position:
var {$'REG-ORIG'}; // here is the broblem
does not change anything:
Parse error: parse error, unexpected '{', expecting T_VARIABLE...
thanks for any suggestion,
Alfredo (Italy)
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