我需要在 XML 发票中创建一组 Schematron 规则测试计算。问题是一些测试元素是可选的,当测试元素mjissing时我的规则失败。如何指定类似:“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>
当 amountInclusiveAllowancesCharges 和 invoiceAllowanceChargeAmount 缺失时,它会失败(它们是可选的。
我将不胜感激任何有用的提示,
伊娃