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

SAX questions

  • From: David Megginson <david@m...>
  • To: xml-dev@i...
  • Date: Wed, 22 Jul 1998 16:45:04 -0400

sax questions
Patrice Bonhomme writes:

 > 1/ For instance, the construction of the tree is supporting by the
 > parser (with some insertLast(...)).  Do i need to transfer the tree
 > construction within the "default XML handler" ?

SAX can work as an iterator over a tree, but it is suboptimal: a good
iterator would return each tree node.  For my MSXML SAX driver, I
explicitly disabled tree construction, since the greatest advantage of
an event-based (or streaming) API is the light resource usage.

 > 2/ What about CDATA sections, XML declaration, and validation
 > processus ?

CDATA sections and the XML declaration may both be included in a
level-two SAX, aimed at authoring tools, but they are not relevant for
the down-level processing tasks (such as formatting or database
import) which were SAX's initial target.

The user chooses validation or non-validation implicitly through the
selection of a SAX driver; SAX itself has no facility for turning
validation on or off, though it does allow an application to
distinguish validation errors from well-formedness errors (and to
ignore validation errors if desired).

 > 3/ If i understand the event-based philosophy, an XML parser do not
 > need to know something about DOM objects (no "new Element()", "new
 > Comment()" called within the code of the parser !) ?

The level-one SAX does not report comments.  If you are using
FREE-DOM, you can let FREE-DOM take care of node creation; if you are
building your own DOM using SAX, then you should create nodes inside
the handlers.

 > 4/ Is there a kind of "blue print" for developping an event-based
 > XML parser ?

Not specifically, but if you have access to a copy of DESIGN PATTERNS
(Gamma, Helm, Johnson, and Vlissides) take a look at the Visitor
pattern on page 331.

More usefully, many of the existing XML parsers come with source code,
so dive in!


All the best,


David

-- 
David Megginson                 david@m...
           http://www.megginson.com/

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i...
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/
To (un)subscribe, mailto:majordomo@i... the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo@i... the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@i...)


  • References:

PURCHASE STYLUS STUDIO ONLINE TODAY!

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.
Email
First Name
Last Name
Company
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.