usvg 0.2.0

An SVG simplification library.
Documentation 
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# All supported elements should be listed.
# We keep id's even if `keep_named_groups` is disabled.
# ID on `svg`, `defs`, `stop` and `tspan` is ignored because they can't be rendered directly.
input = '''
<svg id="svg1" viewBox="0 0 1 1">
    <defs id="defs1">
        <linearGradient id="lg1">
            <stop id="stop1" offset="0" stop-color="white"/>
            <stop offset="1" stop-color="black"/>
        </linearGradient>
        <radialGradient id="rg1">
            <stop offset="0" stop-color="white"/>
            <stop offset="1" stop-color="black"/>
        </radialGradient>
        <clipPath id="clip1">
            <rect id="rect2" width="10" height="10"/>
        </clipPath>
        <pattern id="patt1" width="1" height="1">
            <rect width="10" height="10"/>
        </pattern>
    </defs>
    <rect id="rect1" fill="url(#lg1)" stroke="url(#rg1)" clip-path="url(#clip1)" width="10" height="10"/>
    <path id="path1" fill="url(#patt1)" d="M 10 20 30 40"/>
    <text id="text1">Some text</text>
    <text id="text2"><tspan id="tspan2">Some text</tspan></text>
    <image id="image1" width="1" height="1" xlink:href="data:image/png;base64,
        iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAB3RJTUUH4gMLDwAjrsLbtwAAAAlw
        SFlzAAAuIwAALiMBeKU/dgAAABl0RVh0Q29tbWVudABDcmVhdGVkIHdpdGggR0lNUFeBDhcAAAAG
        UExURQAA/xjQP14JpdQAAAABYktHRACIBR1IAAAAFklEQVR42mMAgvp/IJTAhgdB1ADVAgDvdAnx
        N1Ib1gAAAABJRU5ErkJggg=="/>
</svg>
'''
output = '''
<svg
    width="1"
    height="1"
    viewBox="0 0 1 1"
    preserveAspectRatio="xMidYMid"
    xmlns:xlink="http://www.w3.org/1999/xlink"
    xmlns="http://www.w3.org/2000/svg"
    xmlns:usvg="https://github.com/RazrFalcon/usvg"
    usvg:version="0.2.0">
    <defs>
        <linearGradient
            id="lg1"
            x1="0"
            y1="0"
            x2="1"
            y2="0"
            gradientUnits="objectBoundingBox"
            spreadMethod="pad">
            <stop
                stop-color="#ffffff"
                stop-opacity="1"
                offset="0"/>
            <stop
                stop-color="#000000"
                stop-opacity="1"
                offset="1"/>
        </linearGradient>
        <radialGradient
            id="rg1"
            cx="0.5"
            cy="0.5"
            r="0.5"
            fx="0.5"
            fy="0.5"
            gradientUnits="objectBoundingBox"
            spreadMethod="pad">
            <stop
                stop-color="#ffffff"
                stop-opacity="1"
                offset="0"/>
            <stop
                stop-color="#000000"
                stop-opacity="1"
                offset="1"/>
        </radialGradient>
        <clipPath
            id="clip1"
            clipPathUnits="userSpaceOnUse">
            <path
                id="rect2"
                fill="#000000"
                fill-opacity="1"
                stroke="none"
                clip-rule="nonzero"
                d="M 0 0 L 10 0 L 10 10 L 0 10 Z"/>
        </clipPath>
        <pattern
            id="patt1"
            x="0"
            y="0"
            width="1"
            height="1"
            patternUnits="objectBoundingBox"
            patternContentUnits="userSpaceOnUse">
            <path
                fill="#000000"
                fill-opacity="1"
                fill-rule="nonzero"
                stroke="none"
                d="M 0 0 L 10 0 L 10 10 L 0 10 Z"/>
        </pattern>
    </defs>
    <g
        clip-path="url(#clip1)">
        <path
            id="rect1"
            fill="url(#lg1)"
            fill-opacity="1"
            fill-rule="nonzero"
            stroke="url(#rg1)"
            stroke-dasharray="none"
            stroke-dashoffset="0"
            stroke-linecap="butt"
            stroke-linejoin="miter"
            stroke-miterlimit="4"
            stroke-opacity="1"
            stroke-width="1"
            d="M 0 0 L 10 0 L 10 10 L 0 10 Z"/>
    </g>
    <path
        id="path1"
        fill="url(#patt1)"
        fill-opacity="1"
        fill-rule="nonzero"
        stroke="none"
        d="M 10 20 L 30 40"/>
    <text
        id="text1"><tspan><tspan
        fill="#000000"
        fill-opacity="1"
        fill-rule="nonzero"
        stroke="none"
        font-family="Times New Roman"
        font-size="12"
        font-stretch="normal"
        font-style="normal"
        font-variant="normal"
        font-weight="400">Some text</tspan></tspan></text>
    <text
        id="text2"><tspan><tspan
        fill="#000000"
        fill-opacity="1"
        fill-rule="nonzero"
        stroke="none"
        font-family="Times New Roman"
        font-size="12"
        font-stretch="normal"
        font-style="normal"
        font-variant="normal"
        font-weight="400">Some text</tspan></tspan></text>
    <image
        id="image1"
        preserveAspectRatio="xMidYMid"
        x="0"
        y="0"
        width="1"
        height="1"
        xlink:href="data:image/png;base64,
iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAB3RJTUUH4gMLDwAj
rsLbtwAAAAlwSFlzAAAuIwAALiMBeKU/dgAAABl0RVh0Q29tbWVudABDcmVhdGVk
IHdpdGggR0lNUFeBDhcAAAAGUExURQAA/xjQP14JpdQAAAABYktHRACIBR1IAAAA
FklEQVR42mMAgvp/IJTAhgdB1ADVAgDvdAnxN1Ib1gAAAABJRU5ErkJggg=="/>
</svg>
'''