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RE: Is this a good use of XML: XML-formatted images?

  • From: "Costello, Roger L." <costello@mitre.org>
  • To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
  • Date: Sun, 29 Oct 2017 14:55:57 +0000

RE:  Is this a good use of XML: XML-formatted images?

Thanks Timothy.


I was thinking bitmapped images, not vector images.




From: Timothy Cook [mailto:timothywayne.cook@gmail.com]
Sent: Sunday, October 29, 2017 10:25 AM
To: Costello, Roger L. <costello@mitre.org>
Cc: xml-dev@lists.xml.org
Subject: Re: Is this a good use of XML: XML-formatted images?


Maybe you have heard of this?


"This specification defines the features and syntax for Scalable Vector Graphics (SVG) Version 1.1, a modularized language for describing two-dimensional vector and mixed vector/raster graphics in XML."





On Sun, Oct 29, 2017 at 11:01 AM, Costello, Roger L. <costello@mitre.org> wrote:

Hi Folks,

JPEG/JFIF, GIF, PNG, BMP are, as you know, binary data formats for images.

Why are there no XML-formatted images? Is XML not a good format for images? If it’s not, why not? I’ll speculate: perhaps the reason is simply that XML is too verbose. Is that the reason? Are there other reasons?

Below is a fictitious XML-formatted image. It has a metadata section with XML elements describing the image. After that is an image section containing the raw pixel (RGB) data.

As I look at this fictitious XML-formatted image, I tend to think that XML is not a good fit. Here’s why: Each pixel element contains text that is meaningless on its own. For example, what does <red>100</red> mean? Meaning – the image -- is spread over a large collection of elements. Perhaps, when meaning is spread widely and thinly, it is harder for applications to find meaning in XML than in binary?



<model>Canon EOS 60D</model>
<focal-length>40.0 mm</focal-length>



Timothy Cook

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