text: 
  const query = require('../query')
  const parse = require('../parse')
  const shared = require('./shared')
  
  let system = null
  let document = null
  
  function enter(node, index, parents) {
  
  	if (! query.is_type(node, 'expression')) return
  	if (! query.is_type_value(node.value[0], 'symbol', 'break')) return
  	node.value[0].value = 'br'
  	node.value.splice(1, 0, {
  		type: 'symbol',
  		value: '2',
  		whitespace: ' '
  	})
  }
  
  module.exports = function(system_, document_) {
  	
  	system = system_
  	document = document_
  	return {
  		enter
  	}
  }
  