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Re: XML and LDAP: Common APIs?

• From: rweltman@n... (Rob Weltman)
• To: xml-dev@l...
• Date: Sun, 27 Aug 2000 17:55:06 -0700

"John F. Schlesinger" wrote:

> Well, the problem isn't whether the query engine needs to know the data
> type, it is whether I need to know the data type to formulate the query - or
> maybe I'm barking up the wrong tree?
>

  Suppose you want to search for employees with an employee number higher than
200. You could express that in LDAP filter syntax as "(employeeNumber > 200)".
Should the query return a record for the employee with number 1000? It depends
on if the value is considered a string or an integer (in LDAP it is determined
by the syntax of the attribute).

Rob


>
> Yours,
> John F Schlesinger
> SysCore Solutions
> 212 619 5200 x 219
> 917 886 5895 Mobile
>
> -----Original Message-----
> From: rsanford [mailto:rsanford@n...]
> Sent: Friday, August 25, 2000 3:48 PM
> To: xml-dev@l...
> Subject: RE: XML and LDAP: Common APIs?
>
> for single values the query engine wouldn't need to
> know what the data type was but what about range
> queries. for example, how would you search for
> records where a date is between 2 march 98 and 4
> august 99?
>
> rjsjr
>
> > -----Original Message-----
> > From: John F. Schlesinger [mailto:johns@s...]
> > Sent: Friday, August 25, 2000 11:25 AM
> > To: 'KenNorth'; xml-dev@l...
> > Subject: RE: XML and LDAP: Common APIs?
> >
> >
> > Ken wrote:
> > "How do you know whether a query should match a binary '101' or a decimal
> > '101' if you don't use data types?"
> >
> > I don't think I need to know that to formulate a query. The
> > system that does
> > the matching will have to cast both the things being matched and my match
> > string to some common form, but that's a different problem. In many cases
> > everything is cast to a string - then my "101" matches ether a
> > decimal "101"
> > or a binary "101". If I meant a decimal "101" and it matched to a binary
> > "101" by mistake, then I was querying the wrong field.
> >
> > Yours,
> > John F Schlesinger
> > SysCore Solutions
> > 212 619 5200 x 219
> > 917 886 5895 Mobile
> >
> > -----Original Message-----
> > From: KenNorth [mailto:KenNorth@e...]
> > Sent: Thursday, August 24, 2000 4:37 PM
> > To: xml-dev@l...
> > Subject: Re: XML and LDAP: Common APIs?
> >
> >
> >
> >
> > > Francis wrote:
> > > "...Xpath (unlike XML-Schema)doesn't understand basic types like dates"
> > >
> > > I don't need data types to query.
> >
> > Okay, let's say you have a value of '101'.
> >
> > How do you know whether a query should match a binary '101' or a decimal
> > '101' if you don't use data types?
> >
> >
> >
> >
> >
> >

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