示例：非线性回归 1

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    <define xmlns="http://schemas.mathsoft.com/math50">
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        <id labels="*" xml:space="preserve">GNfit</id>
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          <id labels="*" xml:space="preserve">x</id>
        </boundVars>
      </function>
      <apply>
        <indexer />
        <apply>
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            <id labels="VARIABLE" xml:space="preserve" label-is-contextual="true">β</id>
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        <real>0</real>
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        </trace>
      </traces>
      <graph-size width="464.4" height="216" />
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        <xAxis rank="1" legend-position="PlotBoundaryBottom" start="0" end="1.3">
          <axisLine position="ticknumberlock" positionticmark="0" legendWidth="69.13" />
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            <gridFrequency>14</gridFrequency>
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            <tickMarks display="true" />
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        </xAxis>
        <yAxis rank="1" legend-position="PlotBoundaryLeft" start="0.05" end="2.8">
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          <axisGrid>
            <gridFrequency>12</gridFrequency>
            <gridLabels display="true" />
            <gridLines />
            <tickMarks display="true" />
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          <axisLabel />
          <markers />
          <numberFormat>
            <decimal precision="3" show-trailing-zeros="false" radix="dec" imaginary-value="i" />
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                <placeholder xmlns="http://schemas.mathsoft.com/math50" />
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            <plotEquation>
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                <apply xmlns="http://schemas.mathsoft.com/math50">
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                  <id xml:space="preserve">x</id>
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