[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: parser models

model parser pattern

Arjun Ray wrote:
> james anderson <james.anderson@s...> wrote:
> | in the case of a pull parser, calls like currContent.newChild, below,
> | produce instances which are eventually passed back to the application,
> | while in a push parser they pass control into the application. there
> | is little difference between the two.
> I'm probably misunderstanding what you're saying, but one big difference
> would seem to be that the definition of the instance is determined by the
> parser system with pull and by the application with push.

unless the parser always works with a construction context, for which application provides the initial value. in that case, the context is in the position to
instantiate model nodes. 

>                                                           If you're
> saying that access to the parser (to pull event notifications) could be
> tag-teamed - on a call stack - between instance builders and content
> handlers, I'd agree: this is just the classic recursive descent pattern.

is it? does "classic recursive descent" pass both a control instance and a model instance?

> | nb. it is better for the interface and logic to distinguish between the
> | construction context and the constructed instance and to permit the
> | application the opportunity to decide whether they coincide.
> Yes, that's why I termed the example "cheesy".  The same class need not
> implement both Element and Content interfaces. The point of the pattern is
> the ability to separate them.

more general than that. the same class need not implement both the model and control interface. it applies to whatever is to be parsed, not just elements. 



Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.

Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.