OGNL provides a simple way to call the same method or extract the same property from each element in a collection and store the results in a new collection. We call this "projection," from the database term for choosing a subset of columns from a table. For example, this expression:
returns a list of all the listeners' delegates. See the coercion section for how OGNL treats various kinds of objects as collections.
During a projection the #this variable refers to the current element of the iteration.
objects.{ #this instanceof String ? #this : #this.toString()}
The above would produce a new list of elements from the objects list as string values.
