Re: WWW/Internet 2009: 2nd CFP until 21 September

From: paul c <toledobythesea_at_oohay.ac>
Date: Fri, 14 Aug 2009 14:25:30 GMT
Message-ID: <utehm.41210$PH1.31779_at_edtnps82>



Mr. Scott wrote:
...
> The table {X,A,B,C,D,E} has one predicate. All of the attributes apply to
> all orders even if their values are at present unknown.
>
> The predicate is "being an order that has order number X for customer E that
> was placed on date D with delivery e-mail address A and delivery snail-mail
> address B and delivery contact phone number C where X is an element of the
> domain of all order numbers and E is an element of the domain of all
> customers and D is an element of the domain of all dates and A is an element
> of the domain of all e-mail addresses and B is an element of the domain of
> all snail-mail addresses and C is an element of the domain of all phone
> numbers" where X, A, B, C, D and E are free. A row in the table consists of
> values that are to be substituted for free variables in the predicate. The
> row {x1,a1,b1,c1,d1,e1} would mean after substitution "the order with order
> number x1 for customer e1 that was placed on date d1 with delivery e-mail
> address a1 and snail-mail address b1 and delivery contact phone number c1."
> A row with a null snail-mail address and a null delivery contact,
> {x2,a2,d2,e2} means after substitution "the order that has order number x2
> for customer e2 that was placed on date d2 with delivery e-mail address a2
> and delivery snail-mail address B and delivery contact phone number C where
> B is an element of the domain of all snail-mail addresses and C is an
> element of the domain of all phone numbers."
> ...

How can four values be substituted into a predicate with six place-holders? Received on Fri Aug 14 2009 - 09:25:30 CDT

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