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From David Sean Taylor <da...@bluesunrise.com>
Subject Re: Adding Required Spring Categories Metadata for Filtering
Date Wed, 18 Feb 2009 17:53:45 GMT

On Feb 18, 2009, at 8:14 AM, Randy Watler wrote:

> Ate,
> Thanks for the reply. I am still pondering this, so I am not sure I  
> am going this route. If I do, I will follow your suggestions below.
> Would you have any objections to using a separate meta tag key for  
> required, (and possibly inverse), categories? I understand the use  
> of a '-' and '+' in CSV lists is a pattern in Spring, but unless we  
> start writing full predicate expressions, the syntax is going to be  
> obtuse for the layman. Do you think something like this is more  
> clear or more confusing?
> <meta key="j2:requires" value="ojb"/>
> <meta key="j2:cat" value="dbPageMangler"/>
> <meta key="j2:alias" value"..."/>
> In fact, perhaps this is even better:
> <meta key="j2:requires" value="ojb"/>
> <meta key="j2:supports" value="dbPageMangler"/>
> <meta key="j2:alias" value"..."/>
> That way I could also support this syntax in parallel:
> <meta key="j2:cat" value="dbPageMangler,+ojb"/>
> <meta key="j2:alias" value"..."/>
> Thoughts?

Expressions would be the easiest to understand. Distilling to its  
essence, some examples:

(dbpm OR jpa)

dbpm OR ojb AND serializer

<meta key="j2:cat" value="(an expression like above)"/>

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