[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] 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...)
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|