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Article #7385Re: ��ô��XML��ѯ���Խ�����ʽ������
From: ��Զ
Date: Sat, 02 Aug 2003 03:43
Date: Sat, 02 Aug 2003 03:43
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1883 bytes
I guess if you want to do some reasoning or anything similar, you have to do it on the calculus or algebraic form of the language. c.f., SQL and relational algebra equavalence rules. However, even for simpler query language such as SQL, there is no clearly defined algebra for it. However, if you are doing research, you might restrict yourself to a core set of algebra operators though. �� �� gzm@smth.org (�̺�����) �Ĵ������ᵽ: �� : �ͱ�����˵��������ͨ�� BNF���������������涨������ġ� : ���������Ҫ������з��������翼��ij���Ӽ���ij�����ʣ��Ҹ� : ����������أ� : ����������ô������һ�����ʵ��Ӽ���������ô���װ��� -- +-------------------------+ | Ц��ܴ�����ȴ̫�ࡣ | +-------------------------+ [m[1;36m�� ��Դ:����ˮ˼Դ bbs.sjtu.edu.cn��[FROM: С�ٺ�BBS][m
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arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!sn-xit-02!sn-xit-06!sn-xit-04!sn-xit-01!sn-xit-08!supernews.com!newsfeed.news2me.com!newsfeed.media.kyoto-u.ac.jp!news.neu.edu.cn!SJTUShow Full Headers
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X-Google-Language: ENGLISH,GB X-Google-Thread: 115571,707ae26e8e83020b X-Google-Attributes: gid115571,public X-Google-ArrivalTime: 2003-08-01 20:44:52 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!sn-xit-02!sn-xit-06!sn-xit-04!sn-xit-01!sn-xit-08!supernews.com!newsfeed.news2me.com!newsfeed.media.kyoto-u.ac.jp!news.neu.edu.cn!SJTU From: fervvac.bbs@bbs.sjtu.edu.cn (��Զ) Newsgroups: cn.bbs.comp.xml Subject: Re: ��ô��XML��ѯ���Խ�����ʽ������ Date: 02 Aug 2003 03:43:58 GMT Organization: ��ˮ˼Դ Message-ID: <47UiaT$25x@bbs.sjtu.edu.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 8bit X-Filename: XML/M.1059795677.A Lines: 20