1. A method of storing data, from a markup document containing a plurality of elements and a plurality of attributes, in a relational database, said method comprising: storing an element record for every element of said plurality of elements in an element table of said relational database, wherein each element record includes a unique element ID, and an element data set; and storing an attribute record for every attribute of said plurality of attributes in an attribute table of said relational database, wherein said attribute record comprises an attribute data set for one attribute and an element ID of an element to which the one attribute is assigned.