Search /
Advanced search  |  Help  |  Site map
Click for Layer 8! No, really, click NOW!
Networking for Small Business
How Apple's billion dollar sapphire bet will pay off
iPhone 6 rumor rollup for the week ending April 18
Arista co-founder may have switch maker by its jewels
Open source pitfalls – and how to avoid them
AT&T's expanded 1 Gbps fiber rollout could go head to head with Google
BlackBerry Releases BES 10 Security Update to Address 'Heartbleed' Flaw
Verizon: Web apps are the security punching bag of the Internet
Cisco announces security service linked with new operations centers
Dell launches virtual storage accelerator, aims to boost SAN performance
Free OS X Mavericks now powers half of all Macs
Even the most secure cloud storage may not be so secure, study finds  
3D printing will transform these five industries
Most but not all sites have fixed Heartbleed flaw
NEC launches face-recognition protection for PCs
Hundreds of medical professionals targeted in multi-state tax scam
Super-high frequencies could one day deliver your mobile video
Americans cool with lab-grown organs, but not designer babies
IT Departments Not Losing Ground to Managed Service Providers (Yet)
Where's my gigabit Internet, anyway?
IE6: Retired but not dead yet
Enterprise who? Google says little about Apps, business cloud services in Q1 report
DDoS Attackers Change Techniques To Wallop Sites
Can we talk? Internet of Things vendors face a communications 'mess'
AMD's profitability streak ends at two quarters
Michaels says breach at its stores affected nearly 3M payment cards

XML worth a thousand pics

Gearhead archive

Last week we were cruel and unusual - we gave you a chunk of Scalable Vector Graphics code but put off explaining it until this week.

Now where were we. . . . The code:

<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20000303 Stylable//EN" "<a href=""></A>">

These are standard declarations that declare this is XML and that specify the Document Type Definition. DTD is a set of rules that define elements and attributes of an XML document and spell out how valid documents are structured. In effect, a DTD provides an integrity check on a specific type of XML content.

<svg xml:space="preserve" width="3in" height="3in"> . . . </svg>

This block defines the actual SVG code. Note xml:space="preserve" in the opening tag. Xml:space is a new XML tag attribute that defines whether white space (spaces, tabs and others) should be preserved by the process that parses XML.

If it is set to "preserve" then the white space should be passed through to the application - here, the SVG interpreter.

The parameters width="3in"height="3in" define the window in the document where the rendered SVG will be displayed. So inside the block:

<text style="fill:blue;" y="15">Gearhead was here.</text>

This specifies that the text is to be rendered in blue, in the default font and default font size, with a baseline 15 pixels from the top left corner of the display area (the origin). Next, we get tricky:

<text font-family="serif" font-size=" 12pt" fill="black" x="0" y="0"
transform="rotate(-90) translate(-100, 180) scale(1.5, 1)">

Here we're defining 12 point, black text in the default font in the serif family to read "Cool." We're moving the text down and to the right relative to the origin, rotating it 90 degrees counterclockwise and stretching it by 50% along its original baseline.

This demo shows the basics of text and transformations under SVG. With SVG, there are three basic drawing elements: text, shapes and paths. Shapes include circles, squares and so on, while paths are chains of line segments that can optionally be specified as closed.

You may have already surmised that SVG files, while relatively small, get complex very quickly. Hand coding SVG graphics is not for the faint of heart.

To this end, a number of graphics tools have become available that support SVG images - for example, editors such as Adobe's Illustrator 9.0 and Jasc Software's WebDraw (see the W3C Web page on SVG editor implementations; and a number of viewers, including the Adobe one mentioned last week (see this page for a long list of viewers, many of which are open source and written in Java).

SVG is a standard to watch. Next week, we'll look at dynamic SVG.

Do as you're told: Write to


NWFusion offers more than 40 FREE technology-specific email newsletters in key network technology areas such as NSM, VPNs, Convergence, Security and more.
Click here to sign up!
New Event - WANs: Optimizing Your Network Now.
Hear from the experts about the innovations that are already starting to shake up the WAN world. Free Network World Technology Tour and Expo in Dallas, San Francisco, Washington DC, and New York.
Attend FREE
Your FREE Network World subscription will also include breaking news and information on wireless, storage, infrastructure, carriers and SPs, enterprise applications, videoconferencing, plus product reviews, technology insiders, management surveys and technology updates - GET IT NOW.