XML - SAX
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SAX (Simple API for XML) and DOM (Document Object Model) both provide programmatic access to XML documents, but differ in their approaches. SAX processes XML documents as a stream of parsing events rather than building an in-memory tree. It is great for linear processing of large XML documents. Unlike DOM, SAX can only be used for parsing existing documents in a stream, not for generating documents. SAX notifies a client program through events as it reads an XML document sequentially.
XML - SAX
- 1. SAX Simple API for XML (SAX) SARASWATHI RAMALINGAM SRI AKILANDESWARI WOMENS COLLEGE
- 2. SAX • Both DOM and the Simple API for XML (SAX) provide a programmatic layer that allows a user to directly access the information contained within an XML document. • However, each of these mechanisms provides a different approach to accessing this information.
- 3. SAX • Whereas DOM creates an object that represents a hierarchical tree of nodes that reflects the structure of an XML document, – SAX processes an XML document by giving applications a stream of parsing events around that document.
- 4. SAX • Rather than interacting with an in-memory XML tree, a user is interacting with a stream of data that can be acted upon. • DOM is great for in-memory tree manipulation, whereas SAX is great for linear processing of large XML documents. • Event-based parsers such as SAX provide a view of XML documents that is data centric and event driven.
- 5. SAX • DOM can also be used for creating documents. Unlike DOM, SAX can only be used for parsing existing documents. • parser for the English language might break up a document into paragraphs, words, and punctuation. • In the case of XML, the important pieces of data include elements, attributes, text, and so on. This is what SAX does.
- 6. SAX • Some SAX parsers can validate a document against a Document Type Definition (DTD). • Validating parsers can also tell you specifically where validation has failed.
- 7. SAX • DOM is an in-memory tree structure of an XML document or document fragment. • • DOM is a natural object model of an XML document, but it’s not always practical. • Large documents can take up a lot of memory.
- 8. SAX • SAX is, in many ways, much simpler than DOM. • There is no need to model every possible type of object that can be found in an XML document. • This makes the API easy to understand and easier to use.
- 9. SAX • SAX is an event-based API. • Instead of loading an entire document into memory all at once, SAX parsers read documents and notify a client program when elements, text, comments, and other data of interest are found. • SAX parsers send you events continuously, telling you what was found next. • The DOM parses XML in space, whereas SAX parses XML in time.