XSLT-1.0 array disable sorting - arrays

Question

I have many similar operations, for example, check that one tag is sum of two other tags.
To write it once, I do next:
<xsl:variable name="psumArray" select="//AAA/SUM1 | //AAA/SUM2"/>
<xsl:variable name="psummandArray1" select="//AAA/A1 | //AAA/A2"/>
<xsl:variable name="psummandArray2" select="//AAA/B1 | //AAA/B2"/>
<xsl:for-each select="$psumArray">
<xsl:variable name="temppos" select="position()"></xsl:variable>
<xsl:if test=" format-number((text()), '#.##') != format-number(number($psummandArray1[$temppos]/text()) + number($psummandArray2[$temppos]/text())), '#.##')">
<ERROR>error!</ERROR>
</xsl:if>
</xsl:for-each>
And I can put to my array variables any number of "selects". But I found that each array sorts it's result by name. And order of members in array is not defined by sequence that I wrote, but defined by select text comparation.
I.e.:
<xsl:variable name="psummandArray2" select="//AAA/B3 | //AAA/B2"/>
Will become as:
<xsl:variable name="psummandArray2" select="//AAA/B2 | //AAA/B3"/>
After sorting.
How to avoid it? Or how to achieve what I want to another way, if that way is not the best?
UPD:
Imput XML is similar to:
<XML>
<A1>50</A1>
<A2>20</A2>
<A3>70</A3>
<A4>90</A4>
<A5>5</A5>
<A6>45</A6>
<A7>35</A7>
<A8>25</A8>
<A9>80</A9>
<A10>110</A10>
<A11>100</A11>
<A12>30</A12>
<A13>70</A13>
...
<A120>33</A120>
</XML>
And there exists rules, such as:
A3 = A6 + A8
A13 = A1 + A2
and etc. More then hundred rules. I have to write XSLT that would check all those rules, and if rule is wrong at some nodes, I have to print <ERROR>Error!</ERROR>
The best I think is to write XSLT, where I need just to add name of sum node and names of summand nodes.
That is why I wrote xslt as above, to check it. And now I was going just to put all rules to arrays. And then I found it sorts arrays, breaking my plans :-)

Answer 1

I have ~100 tasks to check if one node is a sum of two another nodes.
And I don't want to write comparation 100 times
Well, you have to write it out at least once, since it doesn't seem to follow any kind of logic that could be automated. Here's one way you could do it:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes" />
<xsl:template match="/XML">
<xsl:variable name="tests">
<xsl:call-template name="test-sum">
<xsl:with-param name="sum" select="A3"/>
<xsl:with-param name="summands" select="A6 | A8"/>
</xsl:call-template>
<xsl:call-template name="test-sum">
<xsl:with-param name="sum" select="A13"/>
<xsl:with-param name="summands" select="A1 | A2"/>
</xsl:call-template>
<!-- ... -->
</xsl:variable>
<xsl:if test="contains($tests, 'error')">
<ERROR>Error!</ERROR>
</xsl:if>
</xsl:template>
<xsl:template name="test-sum">
<xsl:param name="sum"/>
<xsl:param name="summands"/>
<xsl:if test="$sum!=sum($summands)">
<xsl:text>error</xsl:text>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
Alternatively, you could express your rules as XML - either in an external document, or in the stylesheet itself, then apply a template to that.

Answer 2

With XSLT 2.0 and an XSLT 2.0 processor you can use e.g. <xsl:variable name="psumArray" select="//AAA/SUM1 , //AAA/SUM2"/> to get a sequence of SUM1 elements followed by SUM2 elements.