anchor.diff:      
       + type: Room (optional, string) -  comma-separated list of elements.
         Retrieve entities whose type matches one of the elements in the list.
  +      Incompatible with typePattern.
   
       + idPattern: Bode_.* (optional, string) - A correctly formated regular expression.
         Retrieve entities whose ID matches the regular expression. Incompatible with id.
  +
  +    + typePattern: Room_.* (optional, string) - A correctly formated regular expression.
  +      Retrieve entities whose type matches the regular expression. Incompatible with type.
       
       + q: temperature>40 (optional, string) - A query expression, composed of a list of statements
         separated by `;`, i.e., q=statement;statements;statement.
  
positive.code: 
  A `subject` contains the following subfields:
  
  + `entities`: A list of objects, each one composed of the following subfields (`id`/`idPattern` or
    `type` must be present):
      + `id` or `idPattern`: Id or pattern of the affected entities. Both cannot be used at the same
        time, but at least one of them must be present.
      + `type`: Type of the affected entities (optional).
  + `condition`: Condition to trigger notifications. This field is optional and it may contain two
    properties, both optional:
      + `attrs`: array of attribute names
  
negative.code: 
  # Group Entities
  
  ### List entities [GET /v2/entities{?limit,offset,options,type,id,idPattern,typePattern,q,georel,geometry,coords,attrs,orderBy}]
  
  Retrieves a list of entities that match different criteria (by id, idPattern, type, typePattern or those which
  match a query or geographical query). A given entity has to match all the criteria to be retrieved
  (i.e., the criteria is combined in a logical AND way). Note that the id and idPattern parameters are
  incompatible - cannot be used together. The same incompatibility happens with type and typePattern.
  See [Simple Query Language](#simple_query_language) and [Geographical Queries](#geographical_queries).
  
  The response payload is an array containing one object per matching entity. Each entity follows
  