DOM is a platform-and language- (71) API that allows programs and scripts todynamically access and update the content． structure and style of WWW documents(currently，definitions for HTML and XML documents are part ofthe specification)．Thedocument can be further processed and the results of that processing can be incorporated backinto the presented (72) ．DOM is a (73) -based API to documents，which requires the wholedocument to be represented in (74) while processing it．A simpler altemative to DOM is the event—based SAX，which can be used to process very large (75) documents that do not fitinfo the memory available for processing．

A．text
B．image
C．page
D．graphic