The common auxiliaries of form denote the form or presentation of documents. They are not used to denote the
subject matter of documents. Literary forms (poetry, plays, fiction etc.) are classed under 82-1/-9. Kinds of form not listed in Table 1d may be denoted by (0:...), e.g. 94(0:791) History presented as a film. INNER AND OUTER FORM. Where more than one form aspect is to be expressed, distinction should be made between inner form, where the form influences the subject (e.g. historical presentation) and outer form, which expresses only the physical characteristic s of the information carrier (e.g. a sound recording). Regardless of numerical order, inner form should occur next to the subject before outer form is expressed, e.g. 792(091)(086.7) Theatre - historical form of presentation - sound recording (history of the theatre as a sound recording)