在玩了很多之后，我终于得到了它，以防万一有人像我一样对 SVG 感兴趣并且相对较新。在问题中，我有一些预先生成的 SVG 输出文件，它们的 X、Y 高度、宽度设置全部基于数值，没有英寸、厘米等上下文，但我的要求是适合给定的 X英寸乘 Y 英寸的范围。
所以，我发现了“defs”标签，这就像声明一个变量，以后可以在后面的 SVG 正文中用作“把那个东西放在这里”。在 SVG 的顶部，我能够给出我需要的尺寸。然后，通过使用“g”标签进行分组，我能够以数字方式将某些东西定位到给定的 x,y 位置。然后，在其中，我做了另一个“g”来应用在“defs”部分中声明的“变量”的缩放（因为“g”元素中不能有两个“transform”标签）。
我想出的内容如下所示，希望详细的 cmets 可以帮助其他人研究处理 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">
<!-- Explicitly define the SVG window area as 4 inches by 6 inches -->
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
width="4in" height="6in" >
<!-- Add some styles, fonts etc for line drawing, labels and data -->
<style type="text/css" >
<![CDATA[
line.Black
{ stroke:RGB(0,0,0);
stroke-width:2;
}
text.Hdr
{
font-family: Arial;
font-size:x-small;
stroke: #000000;
stroke-width:.4;
}
text.Data
{
font-family: Courier New;
font-size:normal;
stroke: #000000;
stroke-width:.5;
}
]]>
</style>
<!-- all these "defs" are zero-based position for their own content
and will be speicifcally placed where needed via "g" tags.
The simple "id" name will be used as an "insert <something> here" -->
<defs>
<!-- Below will come from actual data from system
The "ID" is what becomes the "variable" that is later
used later in the SVG as the "put me here" -->
<g id="DataOneElement" >
<text class="Data">SOME TEXT DATA</text>
</g>
<!-- This partial linear barcode generated somewhere else
Notice these are just integer positions, and nothing
to do with specific "inches" measurements. Also, they
start at position 0,0 and go however large they need.
When applied with the "g" positioning, thats where it
starts, then gets scaled from there if needed bigger/smaller -->
<g id="DataPartialBarCode" >
<rect x="0" y="0" width="1" height="50" />
<rect x="4" y="0" width="1" height="50" />
<rect x="6" y="0" width="3" height="50" />
<rect x="10" y="0" width="3" height="50" />
<rect x="14" y="0" width="1" height="50" />
<rect x="16" y="0" width="3" height="50" />
<rect x="20" y="0" width="3" height="50" />
<rect x="24" y="0" width="1" height="50" />
<rect x="26" y="0" width="1" height="50" />
<rect x="30" y="0" width="1" height="50" />
<rect x="32" y="0" width="1" height="50" />
<rect x="34" y="0" width="1" height="50" />
<rect x="38" y="0" width="3" height="50" />
</g>
<!-- Actual data generated from AMS to populate these too.
Notice here too, the entire address starts as position 0,0 -->
<g id="SampleAddress" >
<text class="Data" x="0" y="0">Some Person's Name</text>
<text class="Data" x="0" y="17">First Address Line</text>
<text class="Data" x="0" y="30">Another Address</text>
<text class="Data" x="0" y="43">3rd Address line</text>
<text class="Data" x="0" y="56">And Testing for longer address content</text>
</g>
<!-- another bar code that will generated -->
<g id="AnotherBarCode" >
<rect x="0" y="0" width="1" height="70" />
<rect x="4" y="0" width="1" height="70" />
<rect x="6" y="0" width="3" height="70" />
<rect x="10" y="0" width="3" height="70" />
<rect x="14" y="0" width="1" height="70" />
<rect x="16" y="0" width="3" height="70" />
<rect x="20" y="0" width="1" height="70" />
<rect x="24" y="0" width="1" height="70" />
<rect x="26" y="0" width="1" height="70" />
<rect x="28" y="0" width="3" height="70" />
<rect x="32" y="0" width="1" height="70" />
<rect x="36" y="0" width="1" height="70" />
<rect x="38" y="0" width="3" height="70" />
<rect x="42" y="0" width="3" height="70" />
<rect x="46" y="0" width="1" height="70" />
</g>
</defs>
<!-- Now, starting the drawing of the SVG...
Border around entire box drawing area
Notice these are in specific INCH dimensions... -->
<line class="Black" x1="0in" y1="0in" x2="4in" y2="0in" />
<line class="Black" x1="0in" y1="0in" x2="0in" y2="6in" />
<line class="Black" x1="4in" y1="0in" x2="4in" y2="6in" />
<line class="Black" x1="0in" y1="6in" x2="4in" y2="6in" />
<!-- Translate is Across then Down from the top/left corner of SVG -->
<!-- Translate is NOT based on inch, cm, or other measurements
so you may have to tweak these numbers -->
<g transform="translate( 100 20 ) ">
<!-- Now, take whatever we are providing and scale it within the area.
In this case, scale the ENTIRE "g" object to 1.5 its original size -->
<g transform="scale(1.75)">
<!-- This is where the "defs" variable declaration comes
in, as looking at the "g" tag by the ID name -->
<use xlink:href="#DataOneElement" />
</g>
</g>
<!-- and now the partial barcode "defs" variable -->
<g transform="translate( 20 23 ) ">
<!-- In this case, scale the width by 115% and the height by 95% -->
<g transform="scale( 1.15 .95 )">
<use xlink:href="#DataPartialBarCode" />
</g>
</g>
<!-- Any other specific lines within the area -->
<line class="Black" x1="0in" y1=".8in" x2="4in" y2=".8in" />
<!-- Now, just insert the "defs" from above at a scale that will still be readable.
Cool thing, the entire address is considered a single element here. -->
<g transform="translate(20 97)">
<g transform="scale(.7)">
<use xlink:href="#SampleAddress" />
</g>
</g>
<!-- We can even show the address AGAIN, scaled differently elsewhere. -->
<g transform="translate(2 250)">
<g transform="scale(1.3)">
<use xlink:href="#SampleAddress" />
</g>
</g>
<!-- Another line and then barcode-->
<line class="Black" x1="0in" y1="1.55in" x2="4in" y2="1.55in" />
<g transform="translate( 175 175 ) ">
<!-- Scale this barcode 100% wide, but only 70% height -->
<g transform="scale(1 .7)">
<use xlink:href="#AnotherBarCode" />
</g>
</g>
</svg>