new_contents: #!/usr/bin/env python
  # encoding=utf8
  
  from flexbe_core import EventState, Logger
  import json
  
  class Wonderland_Read_Entity_Position(EventState):
  	'''
  	Read the 3D position of an entity in a json string
  
  	># json_text    string  command to read
  	
  	#< x_pos        int  x position of the entity
  	#< y_pos        int  y position of the entity
  	#< z_pos        int  z position of the entity
  	
  	<= done         return when at least one entity exist
  	<= zero         return when no entity have the selected name
  	<= error        return when error reading data
  
  	'''
  	
  	def __init__(self):
  		# See example_state.py for basic explanations.
  		super(Wonderland_Read_Entity_Position, self).__init__(outcomes=['done', 'zero', 'error'], input_keys=['json_text'],
  			output_keys=['x_pos', 'y_pos', 'z_pos'])
  	
  	def execute(self, userdata):
  		#parse parameter json data
  		data = json.loads(userdata.json_text)
  		
  		#read if there is data
  		if not data:
  			#continue to Zero
  			return 'zero'
  		
  		#try to read data
  		if 'x' not in data[0]:
  			#continue to Error
  			return 'error'
  		
  		if 'y' not in data[0]:
  			#continue to Error
  			return 'error'
  		
  		if 'z' not in data[0]:
  			#continue to Error
  			return 'error'
  		
  		#write return datas
  		userdata.x_pos = data[0]['x']
  		userdata.y_pos = data[0]['y']
  		userdata.z_pos = data[0]['z']
  		
  		#continue to Done
  		return 'done'
subject: Add a state for read an entity position in Wonderland.