gistfile1.js

var foo = new Thing(),
    bar = new Thing();

foo.process(function (stream) {
  return {
    date: stream.splice('<div class="date">', '</div>'),
    city: stream.splice('<h3 class="city">', '</h3>'),
    url: stream.splice('<div class="item">', '</div>')
          .match(/<a href="(.*?)">(.*?)<\/a>/)
  }
}).on('url', bar);

bar.process(function (stream) {
  return {
    data: stream.splice('<div class="content">', '</div>')
  }
}).on('data', whatever)

{ date: '9-25-2014', city: 'seattle', url: 'http://foo.com/seattle/1', content: 'whatever 1' }
{ date: '9-25-2014', city: 'seattle', url: 'http://foo.com/seattle/2', content: 'whatever 2' }
// not: { date: '9-26-2014', city: 'seattle', url: 'http://foo.com/seattle/2', content: 'whatever 2' }
{ date: '9-26-2014', city: 'seattle', url: 'http://foo.com/seattle/3', content: 'whatever 3' }
{ date: '9-26-2014', city: 'seattle', url: 'http://foo.com/seattle/4', content: 'whatever 4' }