示例：绘制函数及其导数的图像

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      <title class="- topic/title " xml:lang="zh_CN" toc="yes" wwtype:type="Paragraph" xmlns:wwtype="urn:WebWorks-Type-Schema" />
      <legend xml:lang="zh_CN" />
      <traces xml:lang="zh_CN">
        <trace xml:lang="zh_CN" num-of-points="500">
          <traceStyle color="#FF00008B" symbol="none" line-weight="2" line-style="Solid" xml:lang="zh_CN">lines</traceStyle>
        </trace>
        <trace xml:lang="zh_CN" num-of-points="500">
          <traceStyle color="#FF000000" symbol="none" line-weight="1" line-style="Dash" xml:lang="zh_CN">lines</traceStyle>
        </trace>
        <trace xml:lang="zh_CN" num-of-points="500">
          <traceStyle color="#FFFF0000" symbol="none" line-weight="1" line-style="DashDot" xml:lang="zh_CN">lines</traceStyle>
        </trace>
      </traces>
      <axes xml:lang="zh_CN">
        <xAxis rank="1" legend-position="PlotBoundaryBottom" xml:lang="zh_CN">
          <axisLine position="ticknumberlock" positionticmark="5" xml:lang="zh_CN" />
          <axisGrid xml:lang="zh_CN">
            <gridFrequency xml:lang="zh_CN">11</gridFrequency>
            <gridLabels display="true" xml:lang="zh_CN" />
            <gridLines xml:lang="zh_CN" />
            <tickMarks display="true" xml:lang="zh_CN" />
          </axisGrid>
          <axisLabel xml:lang="zh_CN" />
          <markers xml:lang="zh_CN" />
          <numberFormat xml:lang="zh_CN">
            <decimal precision="3" show-trailing-zeros="false" radix="dec" imaginary-value="i" xml:lang="zh_CN" />
          </numberFormat>
          <plotEquations xml:lang="zh_CN">
            <plotEquation xml:lang="zh_CN">
              <math xml:lang="zh_CN">
                <id xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50">x</id>
              </math>
              <math xml:lang="zh_CN">
                <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
              </math>
            </plotEquation>
          </plotEquations>
          <xyDomain scale-type="linear" auto-scale="true" xml:lang="zh_CN">
            <startValue xml:lang="zh_CN">
              <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
            </startValue>
            <endValue xml:lang="zh_CN">
              <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
            </endValue>
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        </xAxis>
        <yAxis rank="1" legend-position="PlotBoundaryLeft" xml:lang="zh_CN">
          <axisLine position="ticknumberlock" positionticmark="5" xml:lang="zh_CN" />
          <axisGrid xml:lang="zh_CN">
            <gridFrequency xml:lang="zh_CN">11</gridFrequency>
            <gridLabels display="true" xml:lang="zh_CN" />
            <gridLines xml:lang="zh_CN" />
            <tickMarks display="true" xml:lang="zh_CN" />
          </axisGrid>
          <axisLabel xml:lang="zh_CN" />
          <markers xml:lang="zh_CN" />
          <numberFormat xml:lang="zh_CN">
            <decimal precision="3" show-trailing-zeros="false" radix="dec" imaginary-value="i" xml:lang="zh_CN" />
          </numberFormat>
          <plotEquations xml:lang="zh_CN">
            <plotEquation xml:lang="zh_CN">
              <math xml:lang="zh_CN">
                <apply xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50">
                  <id xml:lang="zh_CN">f</id>
                  <id xml:lang="zh_CN">x</id>
                </apply>
              </math>
              <math xml:lang="zh_CN">
                <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
              </math>
            </plotEquation>
            <plotEquation xml:lang="zh_CN">
              <math xml:lang="zh_CN">
                <apply xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50">
                  <id xml:lang="zh_CN">df</id>
                  <id xml:lang="zh_CN">x</id>
                </apply>
              </math>
              <math xml:lang="zh_CN">
                <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
              </math>
            </plotEquation>
            <plotEquation xml:lang="zh_CN">
              <math xml:lang="zh_CN">
                <apply xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50">
                  <id xml:lang="zh_CN">df2</id>
                  <id xml:lang="zh_CN">x</id>
                </apply>
              </math>
              <math xml:lang="zh_CN">
                <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
              </math>
            </plotEquation>
          </plotEquations>
          <xyDomain scale-type="linear" auto-scale="true" xml:lang="zh_CN">
            <startValue xml:lang="zh_CN">
              <placeholder xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50" />
            </startValue>
            <endValue xml:lang="zh_CN">
              <real xml:lang="zh_CN" xmlns="http://schemas.mathsoft.com/math50">1.5</real>
            </endValue>
          </xyDomain>
        </yAxis>
      </axes>
    </xyPlot>
  </plot>
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