An XML Pipeline specifies a sequence of operations to be performed on a collection of XML input documents. Pipelines take zero or more XML documents as their input and produce zero or more XML documents as their output.A pipeline consists of steps. Like pipelines, steps take zero or more XML documents as their input and produce zero or more XML documents as their output. The inputs to a step come from the web, from the pipeline document, from the inputs to the pipeline itself, or from the outputs of other steps in the pipeline. The outputs from a step
Introduction: XML and Data
XML stands for eXtensible Markup Language. XML is a meta-markup language developed by the World Wide Web Consortium(W3C) to deal with a number of the shortcomings of HTML. As more and more functionality was added to HTML to account for the diverse needs of users of the Web, the language began to grow increasingly complex and unwieldy. The need for a way to create domain-specific markup languages that did not contain all the cruft of HTML became increasingly necessary and XML was born.
The main difference between HTML and
XPointer is based largely upon a widely-used technology, the Text Encoding Initiative "extended pointer" [Sperberg-McQueen 1994], [Ide 1995]. Extended pointers provide axes for navigating within trees and a rudimentary predicate language for selecting nodes along axes, and have been implemented in several SGML-based browsing systems.
TEI extended pointers introduced "location terms" including root, here, id, child, descendant, ancestor, previous (sibling), next (sibling), preceding, following, and pattern (content matching by regular expressions) --
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