题目内容

Document(url,(68), text, type, length, modify)
Where all the(69)are character strings. In this framework, anindividual document is identified with a(70)in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will de left blank, but this is not uncommon in any database.

A. schema
B. relation
C. platform
D. module

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A．＜X,101,F＞＜X，I12＞B．＜X,I01,F＞＜X，I10＞C．＜X,I01＞＜X，I12＞D．＜X,I01,P＞＜X，I12，F＞

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