There are some special properties of collections that OGNL makes available. The reason for this is that the collections do not follow JavaBeans patterns for method naming; therefore the size(), length(), etc. methods must be called instead of more intuitively referring to these as properties. OGNL corrects this by exposing certain pseudo-properties as if they were built-in.

Collection	Special Properties
Collection (inherited by Map, List & Set)	size The size of the collection isEmpty Evaluates to true if the collection is empty
List	iterator Evalutes to an Iterator over the List.
Map	keys Evalutes to a Set of all keys in the Map. values Evaluates to a Collection of all values in the Map. These properties, plus size and isEmpty, are different than the indexed form of access for Maps (i.e. someMap["size"] gets the "size" key from the map, whereas someMap.size gets the size of the Map.
Set	iterator Evaluates to an Iterator over the Set.
Iterator	next Evalutes to the next object from the Iterator. hasNext Evaluates to true if there is a next object available from the Iterator.
Enumeration	next Evalutes to the next object from the Enumeration. hasNext Evaluates to true if there is a next object available from the Enumeration. nextElement Synonym for next. hasMoreElements Synonym for hasNext.