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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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