looks like $rows->purge did the trick! thanks for the tip, didn't know you could purge on that level.

Thanks to all for the tips -- I'm basically just reading the contents and attributes of a bunch of row/cell elements. (Yes I realize Twig is overkill, but I know how to use it.) And since you asked, here's a snippet:

<?xml version="1.0" encoding="UTF-8"?>

<xmlreport title="Enterprise Internet" dates="May 1, 2013 - May 31, 20
+13">

    <columns>
        <column name="Page" type="dimension">Page</column>
        <column name="Visitors" type="metric">Visitors</column>
        <column name="ABC Visitor %" type="metric">ABC Visitor %</colu
+mn>
        <column name="New Visitors" type="metric">New Visitors</column
+>
        <column name="ABC Visitors" type="metric">ABC Visitors</column
+>
        <column name="Visits per Visitor" type="metric">Visits per Vis
+itor</column>
    </columns>

    <rows>
        <row rownum="1">
            <cell columnname="page" csv="&quot;publib.boulder.ABC.com/
+infocenter/zvm/v6r2/topic/com.ABC.zvm.v620/zvminfoc03.htm&quot;" db="
+53008">publib.boulder.ABC.com/infocenter/...ic/com.ABC.zvm.v620/zvmin
+foc03.htm</cell>
            <cell columnname="cm_visitors" db="407">407</cell>
            <cell columnname="cm_ABCvisitor1" csv="&quot;33.7%&quot;" 
+db="33.700000">33.7%</cell>
            <cell columnname="newvisitors" db="80">80</cell>
            <cell columnname="cm_ABCvisitors" db="137">137</cell>
            <cell columnname="cm_visitspervisitor" db="1.958231">2.0</
+cell>
        </row>
        <row rownum="2">
            <cell columnname="page" csv="&quot;publib.boulder.ABC.com/
+infocenter/zvm/v6r2/topic/com.ABC.zvm.v620/whatsin.htm&quot;" db="113
+6334">publib.boulder.ABC.com/infocenter/...topic/com.ABC.zvm.v620/wha
+tsin.htm</cell>
            <cell columnname="cm_visitors" db="2">2</cell>
            <cell columnname="cm_ABCvisitor1" csv="&quot;0.0%&quot;" d
+b="0.000000">0.0%</cell>
            <cell columnname="newvisitors" db="0">0</cell>
            <cell columnname="cm_ABCvisitors" db="0">0</cell>
            <cell columnname="cm_visitspervisitor" db="1.000000">1.0</
+cell>
        </row>
    </rows>
</xmlreport>
[download]