19. The system of claim 17 , wherein the set of attributes of a node of the initial hierarchical data structure includes geometric parameters of a semantic element of the document in accordance with the pseudo-rendering of the document.
19. The system of claim 17 , wherein the set of attributes of a node of the initial hierarchical data structure includes geometric parameters of a semantic element of the document in accordance with the pseudo-rendering of the document. 21. The system of claim 19 , wherein the set of attributes includes a pseudo-title of the semantic element in the document.