对xpath 1.0中两个特定节点的值求和

问题描述

我试图在xpath 1.0中求和两个特定值。目前，我使用特定的xpath提取所需的字段，因为然后将其映射到JSON输出。

这是xml的示例：

<ns2:Pricing>
                  <ns2:Price>
                    <ns2:ChargeAmount>52247.00</ns2:ChargeAmount>
                    <ns2:PriceDescription>act_237</ns2:PriceDescription>
                  </ns2:Price>
                  <ns2:Price>
                    <ns2:ChargeAmount>558.40</ns2:ChargeAmount>
                    <ns2:PriceDescription>adv_261</ns2:PriceDescription>
                  </ns2:Price>
                  <ns2:Price>
                    <ns2:ChargeAmount>45920.80</ns2:ChargeAmount>
                    <ns2:PriceDescription>base_model_invoice_price</ns2:PriceDescription>
                  </ns2:Price>
                  <ns2:Price>
                    <ns2:ChargeAmount>48800.00</ns2:ChargeAmount>
                    <ns2:PriceDescription>base_model_msrp</ns2:PriceDescription>
                  </ns2:Price>
                  <ns2:Price>
                    <ns2:ChargeAmount>1675.20</ns2:ChargeAmount>
                    <ns2:PriceDescription>dealer_holdback</ns2:PriceDescription>
                  </ns2:Price>
                  <ns2:Price>
                    <ns2:ChargeAmount>558.40</ns2:ChargeAmount>
                    <ns2:PriceDescription>dealer_imr_contribution</ns2:PriceDescription>
                  </ns2:Price>
                  <ns2:Price>
                    <ns2:ChargeAmount>3141.64</ns2:ChargeAmount>
                    <ns2:PriceDescription>employee_incentive_amount</ns2:PriceDescription>
                  </ns2:Price>

我用来提取其中一些值的xpath是：

/SOAP-ENV:Envelope/SOAP-ENV:Body/ns4:ProcessMessageResponse/ns4:payload/ns4:content/ns2:ShowVehicleInvoice/ns2:ShowVehicleInvoiceDataArea/ns2:VehicleInvoice/ns2:Invoice/ns2:VehicleInvoiceVehicleLineItem/ns2:Pricing/ns2:Price/../ns2:Price[ns2:PriceDescription='act_237']/ns2:ChargeAmount

和

/SOAP-ENV:Envelope/SOAP-ENV:Body/ns4:ProcessMessageResponse/ns4:payload/ns4:content/ns2:ShowVehicleInvoice/ns2:ShowVehicleInvoiceDataArea/ns2:VehicleInvoice/ns2:Invoice/ns2:VehicleInvoiceVehicleLineItem/ns2:Pricing/ns2:Price/../ns2:Price[ns2:PriceDescription='dealer_holdback']/ns2:ChargeAmount

如何在xpath 1.0中对这两个字段求和？

解决方法

您可以使用此XPath-1.0表达式获取总和：

/SOAP-ENV:Envelope/SOAP-ENV:Body/ns4:ProcessMessageResponse/ns4:payload/ns4:content/ns2:ShowVehicleInvoice/ns2:ShowVehicleInvoiceDataArea/ns2:VehicleInvoice/ns2:Invoice/ns2:VehicleInvoiceVehicleLineItem/ns2:Pricing/ns2:Price[ns2:PriceDescription='act_237']/ns2:ChargeAmount + /SOAP-ENV:Envelope/SOAP-ENV:Body/ns4:ProcessMessageResponse/ns4:payload/ns4:content/ns2:ShowVehicleInvoice/ns2:ShowVehicleInvoiceDataArea/ns2:VehicleInvoice/ns2:Invoice/ns2:VehicleInvoiceVehicleLineItem/ns2:Pricing/ns2:Price[ns2:PriceDescription='dealer_holdback']/ns2:ChargeAmount

照顾名称空间（必须正确定义它们）。