classThis is a simple implementation of['a Pxp_document.node #Pxp_document.extension as 'a]
hash_index :object
..end
Pxp_tree_parser.index
using
a hash table.method add : string -> 'a Pxp_document.node -> unit
Pxp_tree_parser.ID_not_unique
is raised.method find : string -> 'a Pxp_document.node
Not_found
method index : (string, 'a Pxp_document.node) Hashtbl.t