Re: documents or examples on defining / adding a new syntax?

[Zhang Weiwu <zhangweiwu@realss.com>]

On Mon, 5 Aug 2013, Michael StrÃder wrote:

> Zhang Weiwu wrote:
> > 3. Do I need to design a new syntax at all? My requirement is the following:
> >
> >     I need a new syntax for ranged-values. Examples are:
> >
> >     - netWeight: 12~13kg
> >     - ISOSensitivity: 800~1600
> >     - heightAdjustableRange: 1.2m~1.5m
> >
> >     The spec of ranged-value is a numeric, optionally followed by a
> >     measurement unit, followed by a tild as seperatorâ, followed by
> >     another measurement.
> >
> >     The syntax needs its own comparison rules, so that you can filter a
> >     range, and get entries who offer values ranging in that range.
>
> Not exactly what you're after but have a look at slapo-constraint. Maybe you
> can find some suitable regex patterns for your use-case.
>
> Hmm, it would be handy to have min/max constraints for attribute types for
> which an ORDERING matching rule is defined. So maybe extending
> slapo-constraint would be the most flexible way of implementing ranges.

Thanks for the comment, but the problem your solution to solve is not the 
one I face. I guess I wasn't clear enough.

I do not intend to constrain the value of attributes, but to store the 
constraint into the value.

Perhaps it is best explained with examples. Say I want to find out all desks 
that can adjust to exactly 1.4m, there are 3 entris:

dn: model=BigDesk,dc=wood,dc=com
model: BigDesk
heightAdjustableRange: 1.6m~2m

dn: model=MediumDesk,dc=wood,dc=com
model: MediumDesk
heightAdjustableRange: 1.3m~1.8m

dn: model=SmallDesk,dc=wood,dc=com
model: SmallDesk
heightAdjustableRange: 1.1m~1.5m

And I do an inquiry, expect to get only MediumDesk and SmallDesk.

To reprise, there is no constraint to the value, but there are constraints 
in the value.

There are 2 ways to solve it, I am unsure which is better. The first is to 
design a new SYNTAX, apparently requiring coding a matching model.

The other method is to use multi-value INTEGER syntax:

dn: model=BigDesk,dc=wood,dc=com
model: BigDesk
possibleHeightInCM: 160
possibleHeightInCM: 200

dn: model=MediumDesk,dc=wood,dc=com
model: MediumDesk
possibleHeightInCM: 130
possibleHeightInCM: 180

dn: model=SmallDesk,dc=wood,dc=com
model: SmallDesk
possibleHeightInCM: 110
possibleHeightInCM: 150


And I can find my choice of desk by using:

 (&(possibleHeightInCM>=140)(possibleHeightInCM<=140))

Which should result the SmallDesk and MediumDesk.