A method of performing a search of a numerical DOM (document object model), includes the steps of receiving a query. When the query is a fully qualified query, the target string is transformed to form a fully qualified hashing code. An associative lookup is performed in a map index using the fully qualified hashing code. A map offset is returned. The map offset points to a couplet that can be converted into a standard portion of a structured data document. Finally, a data couplet is returned.