Standard

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Introduction

This document intends to trace the guidelines of a User Interface (in short: UI) for editing bidirectional (in short: Bidi) text. It is assumed that the user enters text in logical sequence, and that the Unicode Bidi Algorithm (in short: UBA) is used to reorder the text for presentation. We assume that the readers of this document have a working knowledge of the UBA. The UBA is described in Unicode Technical Report 9 (see http://www.unicode.org/unicode/reports/tr9).

When designing these guidelines, the following objectives were set, in order of decreasing priority:

1. Prevent actions unexpected by the user, particularly when the action is destructive (erases one or more characters).
2. Make the interface efficient.
3. Keep the interface easy to implement.

Terms and Definitions

Abbreviations

Acronym	Meaning
Bidi	bidirectional
LTR	left-to-right
RTL	right-to-left
UBA	Unicode Bidi Algorithm
UI	User Interface