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7.1.3. XSL-FO and PDF versions
At the time of the writing, using the stylesheets provided by EUROCONTROL it was not yet possible to combine 2 language versions in XSL-FO. Work is in progress in this area. It should be noted that using an alternate production process, where both the PDF and the XML files are produced from within a structured editor, this is not an issue. The PDF files may be created directly with two or more languages being embedded in the same document (recto-verso or multiple columns).
7.2. Internationalisation and Localisation
The XSLT style sheets that produce HTML and XSL-FO are (almost) language- and locale-independent ("internationalised"). When they need to generate static text, such as for en-route tables headings, they use a separate file, which contains translations (localisations) of (almost) all static content. For the EUROCONTROL's eAIP Specimen, this file is named "EC-locales-en-GB.xml".
The locales file is part of an eAIP: the eAIP is not usable without its locales file. It should always be located in the same directory as the XML eAIP file, and be named "-locales.xml", prefixed with the ICAO country code.
7.2.1. Localisation
In the eAIP, a language is identified by a language tag, composed of an ISO language code (ISO 639) and a mandatory ISO country code (ISO 3166), separated by a dash ('-'). By con-vention, language codes are always in lower case while country codes are always in upper case. This is not imposed by ISO standards but it is good practice to respect case in XML context.
7.2.2. How localisations are selected?
An eAIP document declares its language by way of the xml:lang attribute on the e:eAIP ele-ment. XSLT style sheets use this attribute value to find a translation in the translations file.
For each bit of static text to be output, the style sheet (namely, g-gettext.xslt) looks for an exact match of the language tag. If no exact match is available, it produces an error message.
7.2.3. What is NOT language-independent?
The current style sheets contain some static output of numbers and some punctuation charac-ters. Also, no provision is made for language that are not written left to right, top to bottom. For these language, additional work will be needed to adapt the style sheets.
7.3. Reference
RFC 1766 [http://www.ietf.org/rfc/rfc1766.txt] This document explains the use of ISO language and country codes in the context of In-ternet communication.
Chapter 8. Safety and security considerations
8.1. Introduction
For the purpose of this document, the following definitions apply:
Safety Freedom from unacceptable risk. [EUROCONTROL, SRC DOC 4, Glossary of Terms and Definitions & List of Acronyms, Edition 2, 27.02.2002]
Security A combination of measures and human and material resources intended to safeguard civil aviation against acts of unlawful interference. [ICAO, DOC 9569, Definitions]
The Integrated Aeronautical Information Package (IAIP) contains safety-related aeronautical information, which is essential for the daily operations of airlines, pilots, air traffic controllers and other actors in the aeronautical sector.
The eAIP Specification relates to those aspects that are specific to the electronic format. In this context, most stakeholders are concerned with the security and data integrity issue, espe-cially regarding the distribution of aeronautical data over public networks.
Safety and security are not completely separated issues. For example, an attack on computer a server can take the server out of service for several hours or days. This is a security aspect, which triggers a safety issue: the eAIP site hosted by that server might become unavailable for some time.
In this example, software and procedures would be put in place to protect the server against this kind of attack or to ensure the continuity of the service by using different servers or routes. On the safety side, risk mitigation of eAIP unavailability could require to always store and make available on the client side computer/network a local copy of the eAIP. Due to the AIRAC cycle, a local copy will not be outdated in a few hours or days.
　
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