By David Brownell

This concise booklet provides the data you must successfully use the straightforward API for XML (SAX2), the dominant API for effective XML processing with Java. With the SAX2 API, builders have entry to the knowledge in XML files as they're learn, with no enforcing significant reminiscence constraints or a wide code footprint. SAX2 is frequently utilized by different APIs "under the covers", and offers a beginning for processing and growing either XML and non-XML information.While regularly thought of the best method of dealing with XML record parsing, SAX2 additionally consists of an important studying curve. In SAX2, writer David Brownell explores the various information of coping with XML parsers, filtering the knowledge these parsers go back, producing your personal SAX2 occasions to transform non-XML details to an XML shape, and constructing concepts for utilizing event-based parsing in a number of program scenarios.Created in a public technique by way of the XML-Dev mailing record, the SAX2 API is compact and hugely useful. SAX2 makes use of callbacks to record the data in an XML rfile because the rfile is learn, permitting you to create your individual software constructions round the content material of files. No middleman version of a complete XML record is important, and the mapping from XML buildings to Java constructions and again is straightforward.Both builders studying approximately SAX2 for the 1st time and builders returning for reference and complex fabric approximately SAX2 will locate valuable details during this e-book. Chapters supply certain motives and examples of many alternative features of SAX2 improvement, whereas appendices offer a connection with the API and a proof of the relationships among the SAX2 API and the XML details Set.While the middle of the API is kind of approachable, lots of its extra complicated good points are either imprecise and robust. you should use SAX2 to filter out, adjust, and restructure details in layers of processing which make it effortless to reuse widespread instruments. SAX2 additionally has a few major barriers that functions have to handle of their personal methods. This new e-book promises the element and examples required to take advantage of SAX2 to its complete power, making the most of its energy whereas fending off its barriers.

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These behaviors are part of XML, but not part of the data model so they don’t show up in the Infoset. Grouping these events in one interface lets application code centralize treatment of XML or application data errors. After ContentHandler, it’s probably the most important SAX2 handler. It’s also usefully managed apart from other handlers, so in this book it’s usually not lumped with “real” handlers. LexicalHandler This interface mostly exposes information that is intended to be semantically meaningless, such as comments and CDATA section boundaries, as well as entity and DTD boundaries.

The logic behind keeping these interfaces separate, rather than merging all of their methods into one huge interface, is that it’s more appropriate for simple applications. You must explicitly ask for bells and whistles; they aren’t thrust upon you by default. You can easily prune out certain data by ignoring the interfaces that report it. Most code only uses ContentHandler and Err orHandler implementations, so the methods in other interfaces are easy to ignore. Plus, from the application perspective, parser recognition of the extension handlers isn’t guaranteed.

You can combine several such stages into a “pipeline” and debug them using an XMLWriter to watch data as it flows through particular stages. Remember that XMLReader isn’t the only kind of SAX event producer: programs can write events and feed the result to an XMLWriter. Also, the consumer doesn’t need to be an XMLWriter; it could construct any kind of useful data structure. In fact we’ll look later at doing this with DOM. Read Transform Write Figur e 2-3. Simple SAX2 event pipeline This kind of processing pipeline is a fundamental model for more advanced uses of SAX and for structuring components that are SAX-aware.

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