function query($expression, $doc = null, $context = null)
{
$expression = $this->vars->apply($expression, true);
/*if($doc)
{
$expression = preg_replace('/([\w:]+\w)\(([^\)]+)\)/e', "\$this->replace_xpath('\\1', '\\2', \$doc, \$context)", $expression);
}*/
$expression = preg_replace('/([\\w:]+\\w)\\(([^\\)]*)\\)/e', "\$this->replace_permission('\\1', '\\2')", $expression);
//return $doc ? $doc->evaluate($expression, $context) : xpression::evaluate($expression);
return xpression::evaluate($expression);
}
