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On a Web site serving an eAIP, for instance, this would mean that the Web server can be accessed securely (through the HTTPS/SSL protocol), much like we are used to
access secured e-commerce Web sites. The Web server would feature a security certi-
ficate, ensuring that it is indeed the official Web site for serving that eAIP. For more
detailed discussion, please read the safety and security considerations.
Q: Is it safe to access aeronautical information on CD-ROM?
A: This is very similar to paper: Most people tend to say yes, because data written on a
CD-ROM cannot be modified (though it can be destructed). However, when you receive
a CD-ROM by post, how can you be sure that it has not been replaced on the way?
Similarly to data transmitted over the Internet, data on CD-ROM must be authenticated.
Q: How can we ensure data integrity while allowing users/intermediaries to modify data
format?
A: Strictly speaking, we cannot offer that guarantee. However, the use of XML technology
is a great step in the right direction. Because elements of data in the eAIP are individu-
ally identified and marked up, XML developers can write scripts to process data without
actually tampering with data itself.
For example, all routes in sections ENR-3.1 to 3.4 are marked up as route tables. One
can fetch all route tables from an eAIP and display them differently (say, with other
colours). The actual route definitions are preserved: only formatting is different. Now
what we cannot guarantee is that one will not display the route remarks written in white
on a white background...
Appendix A. References and useful links
XML: [http://www.w3.org/XML/] Specification and other links XSL-FO and XSLT: [http://www.w3.org/Style/XSL/] Specification and other links Saxon: [http://saxon.sourceforge.net/] A free and open source XSLT processor Xalan: [http://xml.apache.org/xalan-j/index.html]
A free and open source XSLT processor MSXML: [http://msdn.microsoft.com/library/default.asp?url=/nhp/default.asp?contentid=28000438]
XML resources from Microsoft XT: [http://www.blnz.com/xt/index.html] Another XSLT processor SVG: [http://www.w3.org/Graphics/SVG/] Scalable Vector Graphics, an XML-based vectorial graphics format FOP: [http://xml.apache.org/fop/index.html] A free and open source XSL-FO renderer XEP: [http://xep.xattic.com/] A commercial XSL-FO renderer
Appendix B. Glossary
AIM Aeronautical Information Management
AIP Aeronautical Information Publication
AIS Aeronautical Information Services
AIXM Aeronautical Information Exchange Model
AMDT Amendment
CA Certification Authority
CSS Cascading Style Sheet
DTD Document Type Definition
eAIP Electronic AIP
ECAC European Civil Aviation Conference
HTML Hyper-Text Mark-up Language
ITU International Telecommunication Union
PKI Public Key Infrastructure
PGP Pretty Good Privacy
SGML Standard Generalized Markup Language (ISO 8879)
SVG Scalable Vector Graphics
XML Extensible Markup Language
XSLT Extensible Stylesheet Language Transformations
XSL-FO Extensible Stylesheet Language - Formatting Language
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Electronic AIP Specification(27)
