By David Brownell
This concise booklet can provide the data you must successfully use the straightforward API for XML (SAX2), the dominant API for effective XML processing with Java. With SAX2, builders have entry to details in XML files as they're learn, with out implementing significant reminiscence constraints or a wide code footprint. SAX2 is usually utilized by different APIs "under the covers", and gives a origin for processing and growing either XML and non-XML info. either builders studying approximately SAX2 for the 1st time and builders returning for reference and complex fabric approximately SAX2 will locate worthy details during this ebook. Chapters offer distinct factors and examples of many various points of SAX2 improvement, whereas appendices offer a connection with the API and an evidence of the relationships among the SAX2 API and the XML info Set. whereas the center of the SAX2 API is kind of approachable, lots of its extra complicated positive factors are either imprecise and robust. SAX2 additionally has a few major obstacles that purposes have to handle of their personal methods. This new e-book grants the element and examples required to take advantage of SAX2 to its complete capability, profiting from its energy whereas warding off its boundaries.
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This concise publication offers the knowledge you want to successfully use the straightforward API for XML (SAX2), the dominant API for effective XML processing with Java. With SAX2, builders have entry to info in XML files as they're learn, with no implementing significant reminiscence constraints or a wide code footprint.
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Extra info for SAX2 [Simple API for XML
The first role is an event pr oducer, which is typically an XML parser packaged as an instance of some library class. The producer is in charge of pushing parsing events to objects that serve the second role: an event consumer. Most SAX applications will only have one event producer, though we’ll look at some cases where you need more than one. This chapter touches on several of the ways to configure (or customize) event producers. Consumers normally do most of the “real” work for any given SAX-based application: they make sense of the parsing events and often create some specialized data structures.
For example, if you validated the input against its own DTD, that DTD might have been modified (using the internal subset or some other mechanism) so that it no longer meets your program’s expectations. Such a scan over attribute values can be a good time to 3 January 2002 10:07 Basic ContentHandler Events 41 make sure your application does the right thing with any attributes that need to be #IMPLIED, or have type ID. Other attributes issues Attribute values will always be whitespace-normalized as required by the XML specification.
In this case, we can use code like Example 2-3 to avoid printing that extra whitespace; however, we’ll have to add our own line ends since the input lines won’t have any. Example 2-3. write (new String (buf, offset, length)); } } With a more complicated content model, this particular algorithm probably wouldn’t work. SAX content handlers are often written to understand particular content models and to carefully track application state within 3 January 2002 10:07 Basic ContentHandler Events 37 parses.
SAX2 [Simple API for XML by David Brownell