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‘live access’ versions of the eAIP (e.g. Web sites) should incorporate the core AIP (GEN, ENR, AD) and all accompanying documents (AMDTs, SUPs, AICs, NOTAMs);

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‘disseminated’ versions (for example, CDs) will exclude NOTAMs, but must incor-porate links to NOTAMs on a live website;

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it must be possible to verify the date on which each section became effective, and the source of the information if relevant;

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cross-references within the body of the text (e.g. ‘See section …’) will be implemented as links

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charts in the eAIP must be scalable, zoom-able and display configurable content.

The full results of the study are available in the User Requirements and Usability Guidelines [usability_study.pdf] document. Not all requirements identified by the study are supported by the current eAIP browsing stylesheets. In particular, requirements that refer to advanced search facilities are not supported yet (for example: "the eAIP must have a facility for searching for all instances of a given word in the body of the AIP, and accompanying docu-
ments. The search results will have links into the appropriate sections of the body of the document").
However, such requirements do not affect the eAIP DTD structure, but rather the functionality offered by the stylesheets. It is expected that such requirements could be fulfilled by integrating the eAIP into an XML/HTML document management system.
Chapter 5. Graphics Support
5.1. Supported Graphics Formats
5.1.1. SVG
The recommendation of the EUROCONTROL eAIP Project is for all eAIP graphics to be made available in Scalable Vector Graphics (SVG) format. The SVG format offers perfect quality for display and printing, possibilities to zoom and pan, to search for text, etc. File sizes are typically smaller than for an equivalent graphic in raster format. In addition, it is possible to add "script functions" into the SVG file, which opens the way for an endless number of enhancements. For example, it is possible to show the differences between the current and the previous version of a chart.

5.1.2. Web Graphics and PDF
More generally, the eAIP Specification supports the usual graphical file formats which are supported by Web browsers: GIF, JPEG, PNG.
5.1.3. PDF
PDF (Acrobat) is directly supported as a "graphic" format as well, provided that PDF files contain only one page. PDF is used by many AIS offices to publish their charts electronically. It has the advantage of supporting a vectorial graphic definition, yet being more widely sup-ported than SVG. However, on medium term, the SVG format is likely to become the de-facto format for vectorial graphics in Web browsers.
5.1.4. Other Formats
In theory, any graphical format could be supported by the eAIP. The only limitation is the support from the various softwares that can be used to read or convert an eAIP.
For on-screen consultation, a Web browser is typically used to display the eAIP in HTML format. Some browsers support other graphical formats than those listed above, but not all browsers do.
For paper AIP production, other softwares are used to convert an eAIP in XML in order to print it. AIP producers must naturally pay attention to what graphical formats are supported by their production chain.
Generally speaking, it is safer to use graphical formats which are "open standards". That is, formats which are defined by an independent organisation, which make the format specification freely available. This is the case for SVG, GIF, JPEG, PNG and PDF. As an example, this is not the case for VML (similar to SVG). Moreover, there must not be any patent claim related to these formats. This is specifically not the case for compressed GIF files, which should then be avoided (PNG format is a better alternative).
　
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