singly-linked list
See also

 Array
 Associative array: Creation, Iteration
 Collections
 Compound data type
 Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
 Linked list
 Queue: Definition, Usage
 Set
 Singly-linked list: Element definition, Element insertion, List Traversal, Element Removal
 Stack
enum NEXT,DATA
type slnode(object x)
    return (sequence(x) and length(x)=DATA and myotherudt(x[DATA]) and integer(x[NEXT])
end type
