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# Introduction

Introduction and System Requirements

The Requirements Editor is a content authoring and document development application using structured mark-up (XML) for content editing and validation. The Requirements Editor is the primary authoring component of the Expere Authoring Environment. The application is used to produce an REQ file that combines the content of one or more documents and the rules for producing a unique document given a particular transaction data set. Authored REQ files can be submitted for assembly and generated as output documents for non-production uses such as testing, troubleshooting, and other review activities.

This guide provides practical information on using Requirements Editor to author new content, edit existing content, and assemble documents for non-production output to PDF. It also describes the basic process of authoring structured mark-up documents and their transformation to targeted outputs.

Note: While the content is XML, the Editor has specific functionality that cannot be met by commercial XML editors. Many XML editors insert special characters and comments that are not not valid within the Expere engine and therefore not allowed in Requirements Editor. Therefore, it is important that REQ files are only edited in the Editor. It is also important to note that successive versions of Requirements Editor introduce new features that are then used to author Expere Knowledge Base content; content authored in a newer version of Requirements Editor may not work in an older version so it is important to make sure that the Editor and the released content are compatible.
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