tailieunhanh - Phát triển web với PHP và MySQL - p 78

Generating Personalized Documents in Portable Document Format (PDF) CHAPTER 30 745 Evaluating Document Formats The most important decision we need to make is what format to deliver the certificate in. Options include paper, ASCII text, HTML, Microsoft Word, or another word processor’s format, Rich Text Format, PostScript, and Portable Document Format. Given the ten attributes listed previously, we can consider and compare some of our options. Paper Delivering the certificate on paper has some obvious advantages. We retain complete control over the process. We can see exactly what each certificate output looks like before sending it to the recipient. We do not need to worry. | Generating Personalized Documents in Portable Document Format PDF 745 Chapter 30 Evaluating Document Formats The most important decision we need to make is what format to deliver the certificate in. Options include paper ASCII text HTML Microsoft Word or another word processor s format Rich Text Format PostScript and Portable Document Format. Given the ten attributes listed previously we can consider and compare some of our options. Paper Delivering the certificate on paper has some obvious advantages. We retain complete control over the process. We can see exactly what each certificate output looks like before sending it to the recipient. We do not need to worry about software or bandwidth and the certificate could be printed with anti-counterfeiting measures. It would meet all of our needs except for attributes 5 and 6. The certificate could not be created and delivered quickly. Postal delivery could take days or weeks depending on our and the recipient s location. Each certificate would also cost us a few cents to a few dollars in printing and postage costs and probably more in handling. Automatic electronic delivery would be cheaper. ASCII Delivering documents as ASCII or plain text comes with some advantages. Compatibility will be no problem. Bandwidth required would be small so cost would be very low. The simplicity of the end result will make it very easy to design and very quick for a script to generate. If we present our visitors with an ASCII file however we have very little control over the appearance of their certificate. We cannot control fonts or page breaks. We can only include text and have very little control over formatting. We have no control over a recipient s duplication or modification of the document. This is the method that makes it easiest for the recipient to fraudulently alter her certificate. HTML An obvious choice for delivering a document on the Web is HTML. Hypertext Markup Language is specifically designed for this purpose. As you .