• Source: Stax

Stax can refer to:

StAX, (Computer Programming) Streaming API for reading and writing XML in Java
Stax Ltd, a Japanese brand of electrostatic headphones
Stax Records, an American record company
Lay's Stax, a brand of potato snack chips sold by Lay's

• Source: StAX

Streaming API for XML (StAX) is an application programming interface (API) to read and write XML documents, originating from the Java programming language community.
Traditionally, XML APIs are either:

DOM based - the entire document is read into memory as a tree structure for random access by the calling application
event based - the application registers to receive events as entities are encountered within the source document.
Both have advantages: DOM, for example, allows for random access to the document, and event driven algorithm like SAX has a small memory footprint and is typically much faster.
These two access metaphors can be thought of as polar opposites. A tree based API allows unlimited, random access and manipulation, while an event based API is a 'one shot' pass through the source document.
StAX was designed as a median between these two opposites. In the StAX metaphor, the programmatic entry point is a cursor that represents a point within the document. The application moves the cursor forward - 'pulling' the information from the parser as it needs. This is different from an event based API - such as SAX - which 'pushes' data to the application - requiring the application to maintain state between events as necessary to keep track of location within the document.




Origins


StAX has its roots in a number of incompatible pull APIs for XML, most notably XMLPULL, the authors of which (Stefan Haustein and Aleksander Slominski) collaborated with, amongst others, BEA Systems, Oracle, Sun and James Clark.




Examples


From JSR-173 Specification• Final, V1.0 (used under fair use).
Quote:

The following Java API shows the main methods for reading XML in the cursor approach.

The writing side of the API has methods that correspond to the reading side for “StartElement” and “EndElement” event types.

5.3.1 XMLStreamReader
This example illustrates how to instantiate an input factory, create a reader and iterate over the elements of an XML document.




See also


Competing and complementary ways to process XML in Java (the order is loosely based on initial date of introduction):

Document Object Model (DOM), the first standardized, language/platform-independent tree-based XML processing model; alternate Java tree models include JDOM, Dom4j, and XOM
Simple API for XML (SAX), the standard XML push API
Java XML Binding API (JAXB), works on top of another parser (usually streaming parser), binds contained data to/from Java objects.
Streaming XML
XQuery API for Java




External links


Introduction to StAX XML.com, Harold, Elliotte Rusty
Java Streaming API for XML (Stax) - Tutorial
XMLPull Patterns Article on XML Pull (and StAX) design patterns by Aleksander Slominski.
StAX Parser - Cursor & Iterator APIs Article on Cursor & Iterator APIs by HowToDoInJava.

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