mongodbTagStructure.coffee

Tag:
  _id: ObjectId
  tag: String #formal name of tag, i.e 'Javascript'
  tagL:
    type: String #lower case name of tag, i.e 'javascript'
    index: true #important for performance when searching for tag data from tag name

Item:
  _id: ObjectId
  tags: [String] #array of informal names of tag, i.e 'jaVAsCripT'
  tagsL: [ #array of lowercase tags, these will map to the tagL fields of the tags themselves
    type: String
    index: true #important for performance when searching for items by tag
  ]