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Appendix B: Data Parser
This appendix contains a tutorial, examples and a reference guide for creating
custom data source definition files. Creating a data source definition is an
advanced topic that requires in-depth knowledge of pattern matching,
Internet protocols and formats such as HTTP, HTML and particularly XML.
This appendix includes the following sections:
• Data Source Definition File Overview
• Data Source Tutorial
• Parsing Rule Reference Guide
Data Source Definition File Overview
A data source definition file contains a single XML <DataSource> element. A
<DataSource> element contains a single <General> header element, followed
by one or more <ParsingRule> and/or <DataItem> elements.
When Data Parser opens a definition file, it first reads the <General> element.
Then it retrieves the data source's data and applies all top-level <ParsingRule>
elements in the order they appear in the definition file. Finally, it applies all the
<DataItem> elements, also in order of their appearance
.
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