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谁能帮我写一个相当于给定DTD的Datalog程序。
DTD:
<!DOCTYPE abc[ <!ELEMENT abc (xyz*|def+)> <!ELEMENT xyz (def?)> <!ELEMENT def (#PCDATA)> ]>
在将 dtd 转换为相应的数据记录程序时,我们还需要遵循任何特定规则吗?