$filter

[Michael Schwartz <mike@gluu.org>]

First stab at some ideas for $filter:

1) Prefix notation (like ldap filters). Examples:
   1) (&(a=b)(c=d))
   2) (!(|(a>b)(c<d)))

2) Filter on Context:
   context equality  : (context=+friend)
   context substring : (context=*friends*)

3) Filter on Relational Arcs:
   rel equality      : (rel=+friends)
   rel substring     : (rel=*friend*)

4) Filter on Literal Arcs
   lit equality      : (lit=mike)  (note: "=schwartz" is ok...)
   lit substring     : (rel=*mike*)

5) Use of filters could also be used to specify what part of the arc not 
to return. For example: what if you don't want the $d literal returns:
   (!(lit=$d))

6) Filter on values
   val equality                      : (val=Mike)
   val case insensitive substring    : (val=*Mike*)
   val integer                       : (val>9) ... > < <= >= =
   val date                          : (val>20110615000000000Z)

Now, this might return some messed up graphs, we'd have to probably return 
parent graphs, unless we want the server to return graph fragments.

Thoughts?

- Mike



On Fri, 23 Dec 2011, Markus Sabadello wrote:

. . .


> Regarding filters, we used to have something called XDI queries (originally
> proposed by Giovanni), where you could work with variables, constraints,
> etc., but we didn't fully develop it. I did an implementation of it that
> demonstrated some pretty complex queries, but it was not optimized and had
> really bad performance.
>
> Markus
>
> On Thu, Dec 22, 2011 at 10:55 PM, Michael Schwartz <mike@gluu.org> wrote:
>
> > XDI TC:
> >
> > At OX, we are finding that it can be hard to get just the information you
> > need.
> >
> > For example, let's say the graph for =schwartz is 2GB. Somewhere in my
> > graph, there is a reference to "important-email". How can I search my graph
> > to find this information? There is no way to specify filters. Also, I still
> > think scope is a nagging issue. Let's say I just want to find out the names
> > of the contexts I have under =schwartz*messages. How can I do that? If I do
> > a $get on =schwartz*messages, I'll get back the entire subtree.
> >
> > I think these issues are going to be really important as we compete with
> > SQL and LDAP, where you can express complex filters and conditions.
> >
> > - Mike
> >
> >
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