【66-70】dom is a platform- and language- （66） api that allows programs and scripts to dynamicallyaccessand update the content， structure and style of www documents（currently， definitions forhtmlandxml documents are part of the specification）. the document can be further processed andtheresultsof that processing can be incorporated back into the presented （67）. dom is a （68）-basedap1 to documents， which requires the whole document to be represented in （69）whileprocessingit. a simpler alternative to dom is the event-based sax， which can be used to processverylarge（70） documents that do not fit into the memory available for processing.
