By Wirth N.

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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. Without a consumer to handle events, nothing happens!

The SAX2 event APIs present Infoset-level data; the lower-level alternative is to work directly with text. ) Other XML infrastructure, such as XInclude, generally transforms or augments Infoset data. Higher-level APIs generally hide such XML structures. 0 documents. Namespaces distinguish elements and attributes so that names can be reused when necessary. For example, in document markup a

3 January 2002 10:06 What XML Are We Talking About? 21 probably refers to a tabular presentation of data, but in a furniture catalog it might also refer to something rather different.

Keep in mind that some important DTD-related processing does not involve validation. Documents with DTDs can use entity substitution for document modularity and text portability, and can have attributes defaulted and normalized. Validation with DTDs only involves checking a set of rules. Disabling DTD validation turns off only the rule checks, not the processing for entities and attributes. SAX2 Feature Flags SAX2 exposes many parser behaviors, including DTD validation, using a “feature flag” mechanism.

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A basic course on compiler principles by Wirth N.


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