Schematron对可选元素的计算测试

Question

我需要在XML发票中创建一组Schematron规则测试计算。 问题在于某些被测试的元素是可选的，并且当被测试的元素被mjissing时我的规则将失败。 如何指定类似内容：“如果元素存在则测试值”？

XML实例摘录：

<invoice>
<invoiceLineItem number="1">
    <invoicedQuantity>50</invoicedQuantity>
    <amountExclusiveAllowancesCharges>500</amountExclusiveAllowancesCharges>
    <amountInclusiveAllowancesCharges>455</amountInclusiveAllowancesCharges>
    <itemPrice>10</itemPrice>
    <invoiceAllowanceChargeAmount>45</invoiceAllowanceChargeAmount>
</invoiceLineItem>
<invoiceLineItem number="2">
    <invoicedQuantity>10</invoicedQuantity>
    <amountExclusiveAllowancesCharges>150</amountExclusiveAllowancesCharges>
    <itemPrice>15</itemPrice>
</invoiceLineItem>
</invoice>

我的Schematron检查了计算：

<sch:schema xmlns:sch="http://www.ascc.net/xml/schematron">
    <sch:pattern name="Check calculation in invoicelineItem">
        <sch:rule context="invoiceLineItem">
            <sch:assert test="amountExclusiveAllowancesCharges = invoicedQuantity * itemPrice">The amountExclusiveAllowancesCharges calculation is incorrect.</sch:assert>
            <sch:assert test="amountInclusiveAllowancesCharges = (invoicedQuantity * itemPrice) - invoiceAllowanceChargeAmount">The amountInclusiveAllowancesCharges calculation is incorrect.</sch:assert>
        </sch:rule>
    </sch:pattern>
</sch:schema>

如果缺少amountInclusiveAllowancesCharges和invoiceAllowanceChargeAmount（它们是可选的，则失败）。

如果有任何有用的提示，我将不胜感激，

伊娃

Answer 1

也许到了很晚，但如果不是，或者其他人也有类似的问题：

<sch:schema xmlns:sch="http://www.ascc.net/xml/schematron">
    <sch:pattern name="Check calculation in invoicelineItem">
        <sch:rule context="invoiceLineItem">
            <sch:assert test="amountExclusiveAllowancesCharges = invoicedQuantity * itemPrice">The amountExclusiveAllowancesCharges calculation is incorrect.</sch:assert>
        </sch:rule>
    </sch:pattern>
    <sch:pattern name="Check calculation in invoicelineItem (inclusive)">
        <sch:rule context="invoiceLineItem[amountInclusiveAllowancesCharges][invoiceAllowanceChargeAmount]">
            <sch:assert test="amountInclusiveAllowancesCharges = (invoicedQuantity * itemPrice) - invoiceAllowanceChargeAmount">The amountInclusiveAllowancesCharges calculation is incorrect.</sch:assert>
        </sch:rule>
    </sch:pattern>
</sch:schema>

• 您需要两个规则，因为您希望每次都对invoiceLineItem进行排他性验证，但对于包含项（即使包含可用项）也要进行验证（ context="invoiceLineItem[amountInclusiveAllowancesCharges][invoiceAllowanceChargeAmount]" ）。
• 因此，您需要两种模式： http : //www.schematron-quickfix.com/escali_xsm/escali-ext_en.html#sqf : d109e234
• 其他什么都一样