= Chapter 1 : Introduction
  * Compass -> GUI for MondoDB
  * Database names : collections and documents
    * collections ≅ tables
    * documents / objects ≅ registros
    * namespace = <database>.<collection>
  * Datasets
    * schema
    * documents
    * fields types:
      * int32
      * double
      * string
      * date
  * Fields with Documents as Values
    * uso en índices
    * nested documents : un documento (registro) puede contener otro documento (que contiene sus campos)
  * Fields with Arrays as Values
  * Filters:
    * [[http://www.json.org/|JSON]] format 
    * ''{"key":"value"}''
    * equality filter : exact value
    * range filter : ''{'birth year': {$gte: 1970,$lt: 1975}}''
      * ''$gte''(greater-equal), ''$lt''(less than) : operators
  * geographical data
    * many functions / filtes
    * click+shift to select arround a point