anchor.diff:  - ...
   
   Instead of holding a node reference and start calling methods from
  -that reference in order to figure out if it is the node we want to act
  -over, we can use criterias.
  +that reference in order to find out which is the node we are
  +interested in, we can use criterias.
   
  -NOTE: At the moment criterias are only available in `global
  -transformers`. Check transformers link:javadocs/index.html[javadocs]
  -in order to know which criterias are available.
  +IMPORTANT: Criterias are available directly as static nodes in the
  +link:javadocs/asteroid/Criterias.html[`asteroid.Criterias`] or via
  +link:javadocs/asteroid/A.html[`A.CRITERIA`]
   
  -IMPORTANT: Because criterias are meant to be shared among many types
  -of transformations, it's probably that criterias will be available in
  -the future as standalone functions.
  +=== Transformers
   
   Lets say we would like to apply a given transformation to a specific
   set of classes annotated with a certain annotation.
  
positive.code: `asteroid.global.samples` and nodes containing `Logger` or nodes
  ending with `Example`
  <2> Applying the criteria in the constructor
  <3> Adding a note to filtered nodes
negative.code: 
  Sometimes using only one criteria could be limiting, sometimes we may
  want to combine two or more criterias at once. For that purpose you can
  use `A.CRITERIA.and` and `A.CRITERIA.or`. Check next example:
  
  [source, groovy]
  ----
  