Re: [Jsdsi-users] RE: Why?

[Sameer A. <aj...@cs...>]

We will *not* change JSDSI to support application-specific tags.  The
point of SPKI/SDSI's flexible tag design is to enable applications to
design their own tag format and leverage JSDSI's existing tag semantics.=20
[I was even a bit wary about the "reverse prefix" tag (but I couldn't
think of a way to simulate it using other tags).]

Luis,  I would suggest using a more explicit tag structure, so that you
can extend it more easily in the future.  For example:
(tag (email (*set write sign send)))

This is "extensible" because you can add other permissions to the set, yo=
u
can add fields to the "email" SimpleTag, and you can add other kinds of
permissions to the tag:
(tag (*set (email (*set write sign send edit) (to (list jsdsi-devel))
           (file (*set read write) (*prefix /home/lpmbv))))

Here, I've added a "file" simple tag to the outer set, I've added an
"edit" permission to the inner (email permission) set, and I've restricte=
d
the email permission to work only for letters to the jsdsi-devel list.

Sameer

> I see.
>
> I guess your (tag (* set "send email")) should really be something mroe
> like:
>
> (tag email (* set write sign send))
>
> Otherwise 'we' would need a way of getting application specific tags
> 'into' the jsdsi 'framework'.
>
>
> Sean
>
>
> On Mon, 2004-03-22 at 13:49, Luis Pedro wrote:
>> Sean,
>>
>> I agree with you. The problem here was that i used the first version
>> of jsdsi with something that we call complexTags. That complex tags
>> have atomic meaning, like:
>> 	(tag (* set "send email")) means to do (tag (* write)), (tag (*
>> sign)), (tag (* send))
>> And this is in a xml file(properties file), when the parse is done the
>> set tags and all others are treated like this:
>> 	if(x instanceof SetTag)
>> 		yyyyyy
>> If i use (tag write) wich is a StringTag then the parse is made but in
>> the wrong way. Maybe one day, right now i don't have too much patient
>> to change this one the application. I'll use the earlier SetTag or
>> take the "if (e =3D=3D null || --> e.length < 2 <--)".
>>
>> But i'm the only one encharge of this...they are users and when that
>> happened they were blocked the application went down :))))))
>>
>> Thanks for your explanation
>>
>>    -- Luis Pedro
>>
>>
>> =BB   -----Original Message-----
>> =BB   From: Sean Radford [mailto:sra...@ae...]
>> =BB   Sent: segunda-feira, 22 de Mar=E7o de 2004 13:07
>> =BB   To: Luis Pedro
>> =BB   Cc: devel jsdsi
>> =BB   Subject: Re: Why?
>> =BB
>> =BB   Luis,
>> =BB
>> =BB   (tag (* set foo))
>> =BB
>> =BB   is exactly equivalent in meaning to:
>> =BB
>> =BB   (tag foo)
>> =BB
>> =BB   It was decided that allowing a SetTag to be empty or
>> =BB   contain only one element was non-sensical and so should be
>> =BB   disallowed - with any SetTag that would contain only 1
>> =BB   element (resulting from intersection) to be 'converted' to
>> =BB   the the element itself.
>> =BB
>> =BB   Sorry if it has caused you problems.
>> =BB
>> =BB   Do people want to re-visit this issue?
>> =BB
>> =BB   Sean
>> =BB
>> =BB   On Mon, 2004-03-22 at 12:50, Luis Pedro wrote:
>> =BB   > Well,
>> =BB   >
>> =BB   > I remember, a little, of a discussion about the Tags.
>> =BB   This my sound
>> =BB   > stupid, but can any of u (Sean, Sameer) explain me why the
>> SetTag  =BB   > needs at least 2 elements.
>> =BB   >
>> =BB   > I made an actualization of jsdsi on the application(here)  =BB
>> and because
>> =BB   > of that change it's all up side down :), i think i'm
>> =BB   gonna revert the process!!
>> =BB   > Some people here are beginning to cry :))))....they don't  =BB
>> know about
>> =BB   > the backup!! :)))
>> =BB   >
>> =BB   >    -- Luis Pedro
>> =BB   --
>> =BB   Dr. Sean Radford, MBBS, MSc
>> =BB   sra...@ae...
>> =BB   http://www.aegeus-technology.com
>> =BB
>> =BB
> --
> Dr. Sean Radford, MBBS, MSc
> sra...@ae...
> http://www.aegeus-technology.com
>
>
>
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