R: Generic Methods for SAX callbacks

startElement.SAX {XML}

R Documentation

Generic Methods for SAX callbacks

Description

This is a collection of generic functions for which one can write methods so that they are called in repsonse to different SAX events. The idea is that one defines methods for different classes of the .state argument and dispatch to different methods based on that argument. The functions represent the different SAX events.

Usage

startElement.SAX(name, atts, .state = NULL)
endElement.SAX(name, .state = NULL)
comment.SAX(content, .state = NULL)
processingInstruction.SAX(target, content, .state = NULL)
text.SAX(content, .state = NULL)
entityDeclaration.SAX(name, base, sysId, publicId, notationName,  .state = NULL)
.InitSAXMethods(where = "package:XML")

Arguments

`name`	the name of the XML element or entity being declared
`atts`	named character vector of XML attributes
`content`	the value/string in the processing instruction or comment
`target`	the target of the processing instruction, e.g. the R in `<?R....>`
`base`	x
`sysId`	the system identifier for this entity
`publicId`	the public identifier for the entity
`notationName`	name of the notation specification
`.state`	the state object on which the user-defined methods should dispatch.
`where`	the package in which the class and method definitions should be defined. This is almost always unspecified.

Value

Each method should return the (potentially modified) state value.

Note

This no longer requires the Expat XML parser to be installed. Instead, we use libxml's SAX parser.

Author(s)

Duncan Temple Lang

References

http://www.w3.org/XML, http://www.xmlsoft.org