Eigenpoll : D wish list : Relational class/array algebra 

Example 1: Peter is friend of everyone named "Andrew"

Person peter = new Person("Peter",18);
people[name=="Andrew"].friends ~= peter;

Example 2: Do something with people named "Andrew" when they are friend of people greater than 18 and marriend

foreach(Person someone; peope[age>=18 && married].friends[name=="Andrew"]) {

Example 3: Do someting with people whose some friends are greater than 18 and called Andrew

foreach( Person someone; people[friends[age>18 && name=="Andrew"].length!=0]) {

Example 3: Select people friends of Andrew.
Person andrew;
Person[] AndrewFriends = people[FriendsOf(andrew)];

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