命名空间搜索找不到元素

Question

我试图解析XML响应来处理销售订单，但XPath搜索不起作用。

下面是XML响应的一个片段：

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    <s:Body>
        <SalesOrderServiceFindResponse xmlns="http://schemas.microsoft.com/dynamics/2008/01/services">
            <SalesOrder xmlns="http://schemas.microsoft.com/dynamics/2008/01/documents/SalesOrder">
                <DocPurpose>Original</DocPurpose>
                <SenderId>bell</SenderId>
                <SalesTable class="entity">
                    <_DocumentHash>33e9a9be2bcafdb1edde17c4e12d1166</_DocumentHash>
                    <ConsTarget_JP>No</ConsTarget_JP>
                    <CurrencyCode>USD</CurrencyCode>
                    <CustAccount>ANDE01</CustAccount>
                    <CustGroup>Distributo</CustGroup>
                    <CustomsExportOrder_IN>No</CustomsExportOrder_IN>
                    <CustomsShippingBill_IN>No</CustomsShippingBill_IN>
                    <DAXIntegrationId>{5A1B9C05-99DD-4E4E-91F1-2702117CEF98}</DAXIntegrationId>
                    <Deadline>2016-03-31</Deadline>
                    <DeliveryDate>2016-03-01</DeliveryDate>
                    ...
                </SalesTable>
                <SalesTable>
                    ...
                </SalesTable>
            </SalesOrder>
        </SalesOrderServiceFindResponse>
    </s:Body>
</s:Envelope>

我正在尝试通过多个<SalesTable>实体，以便在外部系统中处理数据。

但是，以下操作不起作用：

response = client.call(:find, 
        message_tag: :SalesOrderServiceFindRequest,
        message: {
            :query_criteria => {
                :@xmlns => "http://schemas.microsoft.com/dynamics/2006/02/documents/QueryCriteria",
                :criteria_element => {
                    :data_source_name => "SalesTable", 
                    :field_name => "CustGroup", 
                    :operator => "Equal",
                    :value1 => "Distributo",
                }
            }
        }
    )

这是空的：

puts response.xpath("//SalesTable")

这也是空的：

puts response.xpath("//SalesOrder/SalesTable", "xmlns" => "http://schemas.microsoft.com/dynamics/2008/01/documents/SalesOrder") # empty

这就是：

puts response.xpath("//SalesOrder", "xmlns" => "http://schemas.microsoft.com/dynamics/2008/01/documents/SalesOrder")

我不明白，因为我可以验证是否存在SalesTable元素，所以应该找到它，但它不起作用。

Answer 1

您需要在查询中包含名称空间前缀。事实上，你已经使用了它xmlns并不能使它自动应用：

response.xpath("//xmlns:SalesOrder", "xmlns" => "http://schemas.microsoft.com/dynamics/2008/01/documents/SalesOrder")

事实上，可能值得使用不同的前缀，例如

response.xpath("//so:SalesOrder", "so" => "http://schemas.microsoft.com/dynamics/2008/01/documents/SalesOrder")