请建议，我正在使用MathML代码，在'subsup'元素中，它应该有三个元素。但是我之前的脚本在'sub'或'subsup'元素之后插入了一些空格标记（内部过程需要）。通过这个现有的'subsup'将有三个以上的孩子。但是我编写的所有条件，但如果没有满足'何时'条件，则无法编码'其他'代码。如果找到空间，那么我的代码将用'mrow'括起'space and following or precedings'，确保msubsup只有三个孩子。
XML：
<article>
<body>
<p>Graphene <inline-formula>
<math>
<mtext>yyyy</mtext>
<msubsup>
<mi>H</mi>
<mn>1</mn>
<mn>2</mn>
</msubsup>
<msubsup>
<mi>A</mi>
<mspace width="0.04"/>
<mn>1</mn>
<mspace width="0.04"/>
<mn>2</mn>
<mspace width="0.04"/>
<mn>2</mn>
</msubsup>
<msubsup>
<mi>B</mi>
<mn>1</mn>
<mspace width="0.04"/>
<mn>2</mn>
<mspace width="0.04"/>
</msubsup>
<msubsup>
<mi>C</mi>
<mn>1</mn>
<mn>7</mn>
<mspace width="0.04"/>
</msubsup>
<msubsup>
<mi>D</mi>
<mn>1</mn>
<mn>2</mn>
<mspace width="0.04"/>
</msubsup>
<msubsup>
<mi>E</mi>
<mspace width="0.04"/>
<mn>1</mn>
<mspace width="0.04"/>
<mn>2</mn>
</msubsup>
</math>
<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="fdr495521ieqn220a39.gif"/>
</inline-formula>
</p>
</body>
</article>
XSLT：
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="msubsup[count(child::*) > 3]">
<xsl:element name="{name()}">
<xsl:for-each select="*"><!--Cheking with each child, grouping mspace with preceded or followed element, ensuring three child with subsup element-->
<xsl:choose>
<xsl:when test="position()=1 and name()='mspace' and not(following-sibling::*[name()='mspace'])"><!--Child 1 having space, then it has to enclose by 'mrow' with immediate following element-->
<xsl:element name="mrow">
<xsl:apply-templates select="self::node()"/>
<xsl:apply-templates select="following-sibling::*[1]"/>
</xsl:element>
<xsl:apply-templates select="following-sibling::*[2]"/>
<xsl:apply-templates select="following-sibling::*[3]"/>
<xsl:apply-templates select="following-sibling::*[4]"/>
<xsl:apply-templates select="following-sibling::*[5]"/>
<xsl:apply-templates select="following-sibling::*[6]"/>
<xsl:apply-templates select="following-sibling::*[7]"/>
</xsl:when>
<xsl:when test="position()=2 and name()='mspace' and not(following-sibling::*[name()='mspace'])"><!--Child 2 having space, then it has to enclose by 'mrow' with immediate preceding element-->
<xsl:element name="mrow">
<xsl:apply-templates select="preceding-sibling::*"/>
<xsl:apply-templates select="self::node()"/>
</xsl:element>
<xsl:apply-templates select="following-sibling::*|node()"/>
</xsl:when>
<xsl:when test="position()=2 and name()='mspace' and following-sibling::*[2][name()='mspace']">
<xsl:element name="mrow">
<xsl:apply-templates select="preceding-sibling::*"/>
<xsl:apply-templates select="self::node()"/>
</xsl:element>
<xsl:element name="mrow">
<xsl:apply-templates select="following-sibling::*[1]"/>
<xsl:apply-templates select="following-sibling::*[2]"/>
</xsl:element>
<xsl:element name="mrow">
<xsl:apply-templates select="following-sibling::*[3]"/>
<xsl:apply-templates select="following-sibling::*[4]"/>
<xsl:apply-templates select="following-sibling::*[5]"/>
<xsl:apply-templates select="following-sibling::*[6]"/>
<xsl:apply-templates select="following-sibling::*[7]"/>
</xsl:element>
</xsl:when>
<xsl:when test="position()=2 and name()='mspace' and following-sibling::*[3][name()='mspace']">
<xsl:element name="mrow">
<xsl:apply-templates select="preceding-sibling::*"/>
<xsl:apply-templates select="self::node()"/>
</xsl:element>
<xsl:apply-templates select="following-sibling::*[1]"/>
<xsl:element name="mrow">
<xsl:apply-templates select="following-sibling::*[2]"/>
<xsl:apply-templates select="following-sibling::*[3]"/>
<xsl:apply-templates select="following-sibling::*[4]"/>
<xsl:apply-templates select="following-sibling::*[5]"/>
<xsl:apply-templates select="following-sibling::*[6]"/>
<xsl:apply-templates select="following-sibling::*[7]"/>
</xsl:element>
</xsl:when>
<xsl:when test="position()=3 and name()='mspace' and not(preceding-sibling::*[name()='mspace'])">
<xsl:apply-templates select="preceding-sibling::*[2]"/>
<xsl:element name="mrow">
<xsl:apply-templates select="preceding-sibling::*[1]"/>
<xsl:apply-templates select="self::node()"/>
</xsl:element>
<xsl:element name="mrow">
<xsl:apply-templates select="following-sibling::*|node()"/>
</xsl:element>
</xsl:when>
<xsl:when test="(position()=4 or position() > 4) and name()='mspace' and not(preceding-sibling::*[name()='mspace'])">
<xsl:apply-templates select="preceding-sibling::*[3]"/>
<xsl:apply-templates select="preceding-sibling::*[2]"/>
<xsl:element name="mrow">
<xsl:apply-templates select="preceding-sibling::*[1]"/>
<xsl:apply-templates select="self::node()"/>
<xsl:apply-templates select="following-sibling::*|node()"/>
</xsl:element>
</xsl:when>
<!--Please suggest, what may be the 'otherwise' code if top all 'when' conditions not met-->
<!--xsl:otherwise>
<xsl:apply-templates select="self::node()"/>
</xsl:otherwise-->
</xsl:choose>
</xsl:for-each>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
必填代码：查看我的xsl，建议使用“其他”代码。我正在使用XSL2版本
必需的OutPut：
enter code here <?xml version="1.0" encoding="UTF-8"?>
<article>
<body>
<p>Graphene <inline-formula>
<math>
<mtext>yyyy</mtext>
<msubsup>
<mi>H</mi>
<mn>1</mn>
<mn>2</mn>
</msubsup>
<msubsup>
<mrow>
<mi>A</mi>
<mspace width="0.04"/>
</mrow>
<mrow>
<mn>1</mn>
<mspace width="0.04"/>
</mrow>
<mrow>
<mn>2</mn>
<mspace width="0.04"/>
<mspace width="0.04"/>
<mn>2</mn>
</mrow>
</msubsup>
<msubsup>
<mi>B</mi>
<mrow>
<mn>1</mn>
<mspace width="0.04"/>
</mrow>
<mrow>
<mn>2</mn>
<mspace width="0.04"/>
</mrow>
</msubsup>
<msubsup>
<mi>C</mi>
<mn>1</mn>
<mrow>
<mn>7</mn>
<mspace width="0.04"/>
</mrow>
</msubsup>
<msubsup>
<mi>D</mi>
<mn>1</mn>
<mrow>
<mn>2</mn>
<mspace width="0.04"/>
</mrow>
</msubsup>
<msubsup>
<mrow>
<mi>E</mi>
<mspace width="0.04"/>
</mrow>
<mrow>
<mn>1</mn>
<mspace width="0.04"/>
</mrow>
<mrow>
<mn>2</mn>
</mrow>
</msubsup>
</math>
<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="fdr495521ieqn220a39.gif"/>
</inline-formula>
</p>
</body>
</article>