Question

我有以下XML：

    <?xml version="1.0" encoding="UTF-8"?>
<Lenders>
    <ns:FinancialOrganization xmlns:ns="http://www.starstandard.org/STAR/5">
    <ns:BusinessTypeCode>F</ns:BusinessTypeCode>
    <ns:CompanyName>FIRST NIAGARA BANK</ns:CompanyName>
    <ns:CompanyCode>1ST NIAGARA BANK</ns:CompanyCode>
    <ns:PostalAddress>
        <ns:LineOne>PO BOX 76</ns:LineOne>
        <ns:LineTwo>HUDSON, NY 12534</ns:LineTwo>
        <ns:CountryID>US</ns:CountryID>
        <ns:Privacy>
            <ns:PrivacyIndicator>false</ns:PrivacyIndicator>
        </ns:Privacy>
    </ns:PostalAddress>
    <ns:LegalClassificationCode>NIAG</ns:LegalClassificationCode>
</ns:FinancialOrganization>
<ns:FinancialOrganization xmlns:ns="http://www.starstandard.org/STAR/5">
<ns:BusinessTypeCode>F</ns:BusinessTypeCode>
<ns:CompanyName>BALLSTON SPA NATIONAL BANK</ns:CompanyName>
<ns:CompanyCode>BALLSTON SPA FIN</ns:CompanyCode>
<ns:PostalAddress>
    <ns:LineOne>87 FRONT STREET</ns:LineOne>
    <ns:LineTwo>BALLSTON SPA, NY 12020</ns:LineTwo>
    <ns:CityName>BALLSTON SPA</ns:CityName>
    <ns:CountryID>US</ns:CountryID>
    <ns:Postcode>12020</ns:Postcode>
    <ns:StateOrProvinceCountrySub-DivisionID>NY</ns:StateOrProvinceCountrySub-DivisionID>
    <ns:Privacy>
        <ns:PrivacyIndicator>false</ns:PrivacyIndicator>
    </ns:Privacy>
</ns:PostalAddress>
<ns:LegalClassificationCode>BSN</ns:LegalClassificationCode>
</ns:FinancialOrganization>
<ns:FinancialOrganization xmlns:ns="http://www.starstandard.org/STAR/5">
<ns:BusinessTypeCode>F</ns:BusinessTypeCode>
<ns:CompanyName>CAPITAL ONE AUTO FINANCE</ns:CompanyName>
<ns:CompanyCode>CAP</ns:CompanyCode>
<ns:PostalAddress>
    <ns:LineOne>P.O.BOX 255605</ns:LineOne>
    <ns:LineTwo>SACRAMENTO CA 95865-5587</ns:LineTwo>
    <ns:CityName>SACRAMENTO</ns:CityName>
    <ns:CountryID>US</ns:CountryID>
    <ns:Postcode>958655587</ns:Postcode>
    <ns:StateOrProvinceCountrySub-DivisionID>CA</ns:StateOrProvinceCountrySub-DivisionID>
    <ns:Privacy>
        <ns:PrivacyIndicator>false</ns:PrivacyIndicator>
    </ns:Privacy>
</ns:PostalAddress>
<ns:LegalClassificationCode>CAP</ns:LegalClassificationCode>
</ns:FinancialOrganization>
</Lenders>

我尝试使用XPath来计算返回的项目数，然后获取单个元素。这是我的例子，没有返回正确的结果：

/Lenders/ns:FinancialOrganization[1]/ns:BusinessTypeCode

count(/Lenders/ns:FinancialOrganization/ns:BusinessTypeCode)

我对XPath很陌生但是这个特殊的挑战让我很难过。我正在使用W3c Xpath评估在线工具：

http://www.utilities-online.info/xpath/?save=7f748259-a214-4f1e-8872-6f6306199331-xpath

Answer 1

最有可能的是，您使用的在线工具不支持XPath中的命名空间前缀。我试图从XML中删除前缀，例如这个元素：

<ns:FinancialOrganization xmlns:ns="http://www.starstandard.org/STAR/5">

变成了这个没有前缀的元素：

<FinancialOrganization xmlns:ns="http://www.starstandard.org/STAR/5">

然后这个XPath按预期返回3：

count(/Lenders/FinancialOrganization/BusinessTypeCode)

在我使用多个支持XPath的.NET库的经验中，我们需要手动声明前缀到命名空间的URI映射，然后才能在XPath查询中使用该前缀。 It seems that the same applies in Java。

XPath表达式没有评估

1 个答案: