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XML is a meta-language (a language to define other languages). It allows us to define an "AIP language" for computers. Using the EUROCONTROL eAIP language, people and computers can talk to each other using the same vocabulary and grammar. 
Q: A: Q: A:  You can find a lot more information about XML on the Web, but the XML FAQ might be a good place to start. What is a DTD and what has it to do with eAIP? DTD stands for Document Type Definition. It is a formal representation of XML doc-uments' structure. To keep up with our previous analogy with languages, the eAIP DTD is a formal definition of our eAIP language's vocabulary and grammar. For more details about the eAIP DTD, please read the eAIP DTD Documentation. Why XML? XML has been chosen because it fulfils the main eAIP objectives: it is commonly used for structuring documents and it is suitable for both human to computer and computer 

to computer interactions. Also, it is a recognised standard since 1998, widely adopted by the software developers in many industries.
Q:  What is XSLT?
A:  XSLT stands for eXtensible Stylesheet Language Transformations. It is an XML-based language that allows to transform an XML document into another XML document (or into text document as well). In the eAIP context, we use XSLT to convert an eAIP in XML into an HTML format or an XSL-FO format. For more information about XSLT, see the references section.
Q:  What is XSL-FO?
A:  XSL-FO stands for eXtensible Stylesheet Language Formatting Objects. It is an XML-based language that allows to express a document with its formatting, for example to print it on paper. In the eAIP context, we use XSL-FO to format an eAIP in order to print it on paper. With adequate software will be available, one will be able to directly print an XSL-FO document. In the mean time, we use software that convert XSL-FO to PDF or PostScript and then print those files. For more information about XSL-FO, see the references section.
Q:  What is SVG?
A:  SVG stands for Scalable Vector Graphics. It is an XML-based language to express 2-dimensional drawings using simple graphical objects such as lines, circles, rectangles and text, and object properties such as color, size and position. One can zoom in to a small portion of an SVG image and still see a very precise definition of the image. In fact, SVG image resolution is only limited by printers' resolution. SVG images can be interactive; for example, one can highlight a single route on route map or click on an object on a map and get additional information about this object. For more information about SVG, see the references section.
Being written in XML, SVG charts can quite easily be linked to other XML information. We will very soon see SVG graphics on-line that are linked to NOTAMs and to textual sections of an eAIP.
10.6. Safety
Q:  How safe is the eAIP?
A:  The eAIP Specification defines an electronic format for the AIP data, which is different from the paper format currently in use. The information content and structure is exactly the same. The quality control system and the static data procedures currently implemen-ted in AIS (ICAO Annex 15 requirement) are equally applicable to the eAIP production process. This ensures that data issued in the form of an electronic AIP is of the same quality as data issued in the form of a paper AIP.
The way AIP/eAIP data is used for operational needs is subject to specific ATS, ATM, avionics, etc. regulations. This will be within the scope of the end-to-end data integrity EUROCONTROL project.
The safety / security considerations included in the eAIP Specification demonstrate that the use of electronic signature technologies can provide better data integrity for the electronic format than for the paper format.
Q:  Is it safe to access aeronautical information via the Internet?
A:  No. Or at least not "naturally": we need to protect data by using security technologies such as electronic signature and authentication.
　
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