PHP XML阅读器字段类型

<?xml version="1.0" encoding="UTF-8"?>
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<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:o="urn:schemas-microsoft-com:office:office">
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<Column ss:Span="1" ss:Width="192"/>
<Row ss:Height="31.5" ss:AutoFitHeight="0">
<Cell ss:StyleID="s40">
<Data ss:Type="String">Обменни курсове за 29.10.2010</Data>
</Cell>
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<Row/>
<Row>
<Cell ss:StyleID="s25">
<Data ss:Type="String">Валута</Data>
</Cell>
<Cell ss:StyleID="s25">
<Data ss:Type="String">Код</Data>
</Cell>
<Cell ss:StyleID="s25">
<Data ss:Type="String">За единици валута</Data>
</Cell>
<Cell ss:StyleID="s25">
<Data ss:Type="String">Лева (BGN)</Data>
</Cell>
<Cell ss:StyleID="s25">
<Data ss:Type="String">Обратен курс за 1 лев</Data>
</Cell>
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<Row>
<Cell ss:StyleID="s30">
<Data ss:Type="String">Австралийски долар</Data>
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<Cell ss:StyleID="s30">
<Data ss:Type="String">AUD</Data>
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<Data ss:Type="Number">1</Data>
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<Cell ss:StyleID="FormattedNumberBorderPatern">
<Data ss:Type="Number">1.37579</Data>
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<Data ss:Type="Number">0.726855</Data>
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<Cell ss:StyleID="s30">

<Data ss:Type="String">Австралийски долар</Data>
<Data ss:Type="String">AUD</Data>
<Data ss:Type="Number">1</Data>
<Data ss:Type="Number">1.37579</Data>
<Data ss:Type="Number">0.726855</Data>