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Re: Early Draft Review: XQuery for Java (JSR 225)

Re:  Early Draft Review: XQuery for Java (JSR 225)
Bob Foster wrote:

>> Not in my experience. Having access to a syntax tree can be quite 
>> useful.
> Yes, it can. But the most common use of syntax trees is as a parse 
> result. A corollary in this domain would be if one could read a stored 
> (or user-entered) query and obtain a syntax tree from it. But I didn't 
> get that from the sketched proposal, which seemed to me to be 
> output-only. Granted, given that there is no actual proposal, one is 
> free to attach all sorts of wonderful things one would like to be in 
> it, but it would be good to know what use cases you or others are 
> thinking an OOPified API would address.
Here is the beginning sketchy proposal
=== from  http://lists.xml.org/archives/xml-dev/200405/msg00346.html

>With algebraic types, it would be possible to build up an abstract 
>syntax tree, which would be passed to the driver before shipping to the 
=== end

The algebraic types bit does not matter, it really boils down to having 
an ast or a similar representation.

All this started to avoid having only strings.

I don't think asking for use cases makes much sense: you can include
o all use cases of the string based API (as all of this is possible, 
either with the objects, or using some wrappers that parse strings), plus
o having a high-level representation of queries (introspection, 
reflection, (schema?)validation)

It is not obvious to do any of the latter use cases with strings (unless 
you parse them), and good design does not a priori make it more 
difficult to get work done.



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