Testing for a pattern

G'day,

I am trying to put together a test that finds the following <col>
sequence 'red' 'green' 'yellow' from the following data. I am guessing
that the preceding sibling axis is the way?

Salud

John

        <asx id="AAC">
                <day id="20030825" weekno="5">
                        <op>127</op>
                        <hi>132</hi>
                        <lo>127</lo>
                        <cl>130</cl>
                        <vol>1260476</vol>
                </day>
                <day id="20030826" weekno="5">
                        <op>131</op>
                        <hi>133</hi>
                        <lo>129</lo>
                        <cl>131</cl>
                        <vol>1339486</vol>
                </day>
                <day id="20030827" weekno="5">
                        <op>131</op>
                        <hi>131</hi>
                        <lo>122</lo>
                        <cl>124</cl>
                        <vol>683080</vol>
                        <col>black</col>
                </day>
                <day id="20030828" weekno="5">
                        <op>125</op>
                        <hi>126</hi>
                        <lo>125</lo>
                        <cl>125</cl>
                        <vol>249813</vol>
                </day>
                <day id="20030829" weekno="5">
                        <op>126</op>
                        <hi>127</hi>
                        <lo>125</lo>
                        <cl>127</cl>
                        <vol>167443</vol>
                </day>
                <day id="20030901" weekno="6">
                        <op>127</op>
                        <hi>128</hi>
                        <lo>125</lo>
                        <cl>125</cl>
                        <vol>219555</vol>
                </day>
                <day id="20030902" weekno="6">
                        <op>127</op>
                        <hi>128</hi>
                        <lo>126</lo>
                        <cl>127</cl>
                        <vol>102461</vol>
                </day>
                <day id="20030903" weekno="6">
                        <op>128</op>
                        <hi>128</hi>
                        <lo>126</lo>
                        <cl>128</cl>
                        <vol>96453</vol>
                </day>
                <day id="20030904" weekno="6">
                        <op>126</op>
                        <hi>129</hi>
                        <lo>126</lo>
                        <cl>127</cl>
                        <vol>119890</vol>
                </day>
                <day id="20030905" weekno="6">
                        <op>129</op>
                        <hi>129</hi>
                        <lo>127</lo>
                        <cl>128</cl>
                        <vol>99757</vol>
                </day>
                <day id="20030908" weekno="7">
                        <op>129</op>
                        <hi>130</hi>
                        <lo>125</lo>
                        <cl>125</cl>
                        <vol>359112</vol>
                </day>
                <day id="20030909" weekno="7">
                        <op>123</op>
                        <hi>125</hi>
                        <lo>119</lo>
                        <cl>121</cl>
                        <vol>695000</vol>
                </day>
                <day id="20030910" weekno="7">
                        <op>121</op>
                        <hi>125</hi>
                        <lo>121</lo>
                        <cl>125</cl>
                        <vol>3705877</vol>
                </day>
                <day id="20030911" weekno="7">
                        <op>125</op>
                        <hi>127</hi>
                        <lo>124</lo>
                        <cl>127</cl>
                        <vol>2037264</vol>
                </day>
                <day id="20030912" weekno="7">
                        <op>129</op>
                        <hi>129</hi>
                        <lo>126</lo>
                        <cl>128</cl>
                        <vol>329914</vol>
                </day>
                <day id="20030915" weekno="8">
                        <op>129</op>
                        <hi>130</hi>
                        <lo>129</lo>
                        <cl>129</cl>
                        <vol>119750</vol>
                </day>
                <day id="20030916" weekno="8">
                        <op>129</op>
                        <hi>129</hi>
                        <lo>127</lo>
                        <cl>128</cl>
                        <vol>1150373</vol>
                        <col>red</col>
                </day>
                <day id="20030917" weekno="8">
                        <op>128</op>
                        <hi>129</hi>
                        <lo>126</lo>
                        <cl>126</cl>
                        <vol>102518</vol>
                        <col>green</col>
                </day>
                <day id="20030918" weekno="8">
                        <op>126</op>
                        <hi>128</hi>
                        <lo>126</lo>
                        <cl>128</cl>
                        <vol>150199</vol>
                        <col>yellow</col>
                </day>
                <day id="20030919" weekno="8">
                        <op>128</op>
                        <hi>129</hi>
                        <lo>127</lo>
                        <cl>129</cl>
                        <vol>82481</vol>
                </day>
        </asx>


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