To define the structure of the lexicon, select the new lexicon in the lexicon list and switch to the Schema and View Editor (in the Switch to menu in the top frame). The editor window has two frames. The left frame shows the default lexicon structure, consisting of a Form and Sense component. The right frame displays the information on the selected element of the schema. The information contains the name of the element, a description and specifies whether the element is mandatory in the lexical entries of the lexicon.