Hi , in your core-drag-drop functions (implemented on polymer 0.5) as you 
can see in this source 
<https://github.com/Polymer/core-drag-drop/blob/master/core-drag-drop.html> , 
line 35-37 the polymer component (as i understand) observes the x and y 
property of itself and it call to the coordinatesChanged method to execute 
it , when you search in the migration guide you say "Unlike Polymer 0.5, 
observers do not support the this.$.elementId syntax for observing changes 
to the properties of local DOM children. However, in some cases you can use 
data binding to bind a property to the child element’s property, and 
observe the local property instead." , so , how you can observe the same 
property (on Polymer 1.0) if you can't reference it?

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