Chapter 7. DOM XML Record Model and Filter Module

Table of Contents

DOM XML filter pipeline configuration

Input pipeline
Extract pipeline
Store pipeline
Retrieve pipeline
Canonical Indexing Format

DOM Indexing Configuration
DOM Indexing MARCXML
DOM Indexing Wizardry
Debuggig DOM Filter Configurations

The record model described in this chapter applies to the fundamental, structured XML record type DOM, introduced in the section called “DOM XML Record Model and Filter Module”. The DOM XML record model is experimental, and its inner workings might change in future releases of the Zebra Information Server.

DOM Record Filter Architecture

The DOM XML filter uses a standard DOM XML structure as internal data model, and can therefore parse, index, and display any XML document type. It is well suited to work on standardized XML-based formats such as Dublin Core, MODS, METS, MARCXML, OAI-PMH, RSS, and performs equally well on any other non-standard XML format.

A parser for binary MARC records based on the ISO2709 library standard is provided, it transforms these to the internal MARCXML DOM representation. Other binary document parsers are planned to follow.

The DOM filter architecture consists of four different pipelines, each being a chain of arbitrarily many successive XSLT transformations of the internal DOM XML representations of documents.

Figure 7.1. DOM XML filter architecture

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Table 7.1. DOM XML filter pipelines overview

Name	When	Description	Input	Output
`input`	first	input parsing and initial transformations to common XML format	Input raw XML record buffers, XML streams and binary MARC buffers	Common XML DOM
`extract`	second	indexing term extraction transformations	Common XML DOM	Indexing XML DOM
`store`	second	transformations before internal document storage	Common XML DOM	Storage XML DOM
`retrieve`	third	multiple document retrieve transformations from storage to different output formats are possible	Storage XML DOM	Output XML syntax in requested formats

The DOM XML filter pipelines use XSLT (and if supported on your platform, even EXSLT), it brings thus full XPATH support to the indexing, storage and display rules of not only XML documents, but also binary MARC records.