1. A method for reconfiguring data network nodes in a data network, the method comprising the steps of: storing information comprising: a first set of data representing a current configuration of the data network nodes, and a second set of data representing a desired configuration of the data network nodes; storing a data model which together with said first and second sets of data provides data structure representations of said current and desired configurations of the data network nodes; generating, from said first and second sets of data and said data model: text entities describing said current and desired configurations of the data network nodes in plain text, and metadata entities associated with said text entities and relating the text of the text entities to said data model; generating, from said first set of data and said second set of data, an information entity representing a difference between said current configuration and said desired configuration, wherein said data model, said text entities, and said metadata entities are used in the generation of said information entity; and reconfiguring at least one of said data network nodes using said information entity.