[xsl] Iterate through variable in XSLT?

hi all,

basically i like to generic produce the following code rather then write it 
by myself
<xsl:template match="/">
<classes>
 <class>
   <xsl:attribute name="name">
   <xsl:text>classA</xsl:text>
 </class>
 <class>
   <xsl:attribute name="name">
   <xsl:text>classB</xsl:text>
 </class>
 <class>
   <xsl:attribute name="name">
   <xsl:text>classC</xsl:text>
 </class>
 <class>
   <xsl:attribute name="name">
   <xsl:text>classD</xsl:text>
 </class>
</classes>
</xsl:template>

the data about classes is not in my source XML file, i define it at runtime. 
i was thinking to define a global variable $classes and iterate it at 
runtime but i don't know how to achieve that.
please help me out, thanks in advance

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