Moin,
versuch's mal folgendermaßen ...
<xsl:for-each select="/issue/fields">
<tr>
<td><xsl:value-of select="field[@fieldname = 'ID:' ]"/></td>
<td><xsl:value-of select="field[@fieldname = 'Type:' ]"/></td>
<td><xsl:value-of select="field[@fieldname = 'Summary:' ]"/></td>
<td><xsl:value-of select="field[@fieldname = 'State:' ]"/></td>
<td><xsl:value-of select="field[@fieldname = 'Assigned User:']"/></td>
<td><xsl:value-of select="field[@fieldname = 'Project:' ]"/></td>
</tr>
</xsl:for-each>