Can I have Multiple SVG images in a single file?
You can only have a single root node in an html document. Nevertheless there are various ways to achieve what you want.
One way is SVG Stacks which works by having all the drawings on top of each other and then just displaying the one you want to see using CSS.
Another way might be to have a shapes.svg like this with all the drawings in different places
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<g transform="translate(0,0)">
<circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" />
</g>
<g transform="translate(0,200)">
<rect width="100" height="100" style="fill:rgb(0,0,255);stroke-width:1;stroke:rgb(0,0,0)" />
</g>
<g transform="translate(0,400)">
<line x1="50" y1="0" x2="0" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
<line x1="50" y1="0" x2="100" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
<line x1="0" y1="50" x2="100" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
</g>
</svg>
And then use svgView to show just the bits you want.
<html>
<body>
<embed src="shapes.svg#svgView(viewBox(50,0,100,100))" style="width:100px; height:100px" type="image/svg+xml" />
<embed src="shapes.svg#svgView(viewBox(0,200,100,100))" style="width:100px;height:100px" type="image/svg+xml"/>
<embed src="shapes.svg#svgView(viewBox(0,400,100,100))" style="width:100px;height:100px" type="image/svg+xml"/>
</body>
</html>
All of these do mean though that you use more memory in the UA as the whole svg file is loaded 3 times and you just see a part of it each time.
Reference:
<svg alt="">
<use xlink:href="shapes.svg#circle"></use>
</svg>
<svg alt="">
<use xlink:href="shapes.svg#square"></use>
</svg>
<svg alt="">
<use xlink:href="shapes.svg#triangle"></use>
</svg>
shapes.svg:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<symbol id="circle">
<circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" />
</symbol>
<symbol id="square">
<rect width="100" height="100" style="fill:rgb(0,0,255);stroke-width:1;stroke:rgb(0,0,0)" />
</symbol>
<symbol id="triangle">
<line x1="50" y1="0" x2="0" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
<line x1="50" y1="0" x2="100" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
<line x1="0" y1="50" x2="100" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
</symbol>
</svg>
Yes, but XML documents need a single root node. Yours has three. Try wrapping the three nodes in an svg element and move the namespace and version number to it. Seems to validate via http://validator.w3.org/check
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<svg id="circle">
<circle cx="100" cy="50" r="40" stroke="black"
stroke-width="2" fill="red" />
</svg>
<svg id="square">
<rect width="100" height="100" style="fill:rgb(0,0,255);stroke-width:1;stroke:rgb(0,0,0)" />
</svg>
<svg id="triangle">
<line x1="50" y1="0" x2="0" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
<line x1="50" y1="0" x2="100" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
<line x1="0" y1="50" x2="100" y2="50" style="stroke:rgb(255,0,0);stroke-width:2" />
</svg>
</svg>