ruby – Nokogiri XPath没有找到某些节点
发布时间:2020-12-17 03:39:09 所属栏目:百科 来源:网络整理
导读:我正在使用Nokogiri修改现有的 XML,但我在选择某些节点时遇到问题. 以下是XML的相关片段: ProductCatalog ProductLineItem updi:ProductIdentification updi:ProductName800-22283-03/updi:ProductName 我可以找到下面两个节点: doc.xpath("//updi:Product
我正在使用Nokogiri修改现有的
XML,但我在选择某些节点时遇到问题.
以下是XML的相关片段: <ProductCatalog> <ProductLineItem> <updi:ProductIdentification> <updi:ProductName>800-22283-03</updi:ProductName> 我可以找到下面两个节点: doc.xpath("//updi:ProductIdentification") => #<Nokogiri::XML... doc.xpath("//updi:ProductName") => #<Nokogiri::XML... 但是,如果我尝试选择其中一个上层节点: doc.xpath("//ProductLineItem") => [] 我找回了一个空阵列.它似乎与前缀有关.我可以找到任何具有前缀的元素,但找不到没有前缀的元素. 更新:这是(相当冗长的)命名空间: xsi:schemaLocation="urn:rosettanet:specification:interchange:ProductCatalogInformationDistribution:xsd:schema:01.00 ....XMLInterchangeProductCatalogInformationDistribution_01_00.xsd" xmlns:dplcs="urn:rosettanet:specification:domain:Design:ProductLifeCycleStatusCode:xsd:codelist:01.03" xmlns:rrt="urn:rosettanet:specification:domain:Shared:RateType:xsd:codelist:01.01" xmlns:dl="urn:rosettanet:specification:domain:Logistics:xsd:schema:02.15" xmlns:ictc="urn:rosettanet:specification:domain:Design:CatalogType:xsd:codelist:01.00" xmlns:updi="urn:rosettanet:specification:universal:ProductIdentification:xsd:schema:01.04" xmlns:dddt="urn:rosettanet:specification:domain:Design:DateType:xsd:codelist:01.00" xmlns:dsdc="urn:rosettanet:specification:domain:Logistics:ShipDateCode:xsd:codelist:01.03" xmlns:ucr="urn:rosettanet:specification:universal:Currency:xsd:codelist:01.02" xmlns:dpiac="urn:rosettanet:specification:domain:Logistics:PortIdentifierAuthorityCode:xsd:codelist:01.03" xmlns:rptc="urn:rosettanet:specification:domain:Shared:PricingTypeCode:xsd:codelist:01.03" xmlns:dit="urn:rosettanet:specification:domain:Procurement:InventoryType:xsd:codelist:01.03" xmlns:dtt="urn:rosettanet:specification:domain:Procurement:TransactionType:xsd:codelist:01.04" xmlns:upd="urn:rosettanet:specification:universal:PhysicalDimension:xsd:schema:01.05" xmlns:dcst="urn:rosettanet:specification:domain:Logistics:CustomsType:xsd:codelist:01.03" xmlns:dsd="urn:rosettanet:specification:domain:Logistics:ShippingDocument:xsd:codelist:01.02" xmlns:uci="urn:rosettanet:specification:universal:ContactInformation:xsd:schema:01.03" xmlns:dpcm="urn:rosettanet:specification:domain:Procurement:PurchaseMethod:xsd:codelist:01.03" xmlns:rpsc="urn:rosettanet:specification:domain:Shared:ProductStatusCode:xsd:codelist:01.01" xmlns:dgrc="urn:rosettanet:specification:domain:Marketing:GeographicRegionCode:xsd:codelist:01.02" xmlns:dtrt="urn:rosettanet:specification:domain:Logistics:TrackingReferenceType:xsd:codelist:01.06" xmlns:umtq="urn:rosettanet:specification:universal:MimeTypeQualifier:xsd:codelist:01.02" xmlns:dcrt="urn:rosettanet:specification:domain:Procurement:CustomerType:xsd:codelist:01.03" xmlns:dscd="urn:rosettanet:specification:domain:Logistics:ShipmentChangeDisposition:xsd:codelist:01.03" xmlns:uc="urn:rosettanet:specification:universal:Country:xsd:codelist:01.02" xmlns="urn:rosettanet:specification:interchange:ProductCatalogInformationDistribution:xsd:schema:01.00" xmlns:dpc="urn:rosettanet:specification:domain:Procurement:PaymentCondition:xsd:codelist:01.03" xmlns:rpmt="urn:rosettanet:specification:domain:Shared:PaymentType:xsd:codelist:01.01" xmlns:dft="urn:rosettanet:specification:domain:Procurement:FinanceTerms:xsd:codelist:01.03" xmlns:dtq="urn:rosettanet:specification:domain:Procurement:TotalQualifier:xsd:codelist:01.03" xmlns:ume="urn:rosettanet:specification:universal:MonetaryExpression:xsd:schema:01.04" xmlns:dcp="urn:rosettanet:specification:domain:Design:Compliant:xsd:codelist:01.02" xmlns:drsc="urn:rosettanet:specification:domain:Marketing:RegistrationStatusCode:xsd:codelist:01.03" xmlns:uat="urn:rosettanet:specification:universal:AbstractType:xsd:schema:01.02" xmlns:dp="urn:rosettanet:specification:domain:Procurement:xsd:schema:02.17" xmlns:rpm="urn:rosettanet:specification:domain:Shared:PaymentMethod:xsd:codelist:01.02" xmlns:dfrt="urn:rosettanet:specification:domain:Procurement:ForecastReferenceType:xsd:codelist:01.03" xmlns:dtec="urn:rosettanet:specification:domain:Procurement:TaxExemptionCode:xsd:codelist:01.03" xmlns:ulc="urn:rosettanet:specification:universal:Locations:xsd:schema:01.04" xmlns:dccc="urn:rosettanet:specification:domain:Procurement:CreditCardClassification:xsd:codelist:01.03" xmlns:drlc="urn:rosettanet:specification:domain:Logistics:ReturnLabelCode:xsd:codelist:01.03" xmlns:st="http://www.ascc.net/xml/schematron" xmlns:dnecc="urn:rosettanet:specification:domain:Logistics:NationalExportControlClassification:xsd:codelist:01.03" xmlns:rpktc="urn:rosettanet:specification:domain:Shared:PackageTypeCode:xsd:codelist:01.01" xmlns:uwt="urn:rosettanet:specification:universal:WeightType:xsd:codelist:01.01" xmlns:dfpt="urn:rosettanet:specification:domain:Logistics:FreightPaymentTerms:xsd:codelist:01.03" xmlns:dte="urn:rosettanet:specification:domain:Procurement:TransportEvent:xsd:codelist:01.03" xmlns:ul="urn:rosettanet:specification:universal:Language:xsd:codelist:01.02" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dbpq="urn:rosettanet:specification:domain:Procurement:BookPriceQualifier:xsd:codelist:01.04" xmlns:drl="urn:rosettanet:specification:domain:Logistics:RouteLocation:xsd:codelist:01.03" xmlns:ssdh="urn:rosettanet:specification:system:StandardDocumentHeader:xsd:schema:01.16" xmlns:dmk="urn:rosettanet:specification:domain:Marketing:xsd:schema:02.12" xmlns:rmat="urn:rosettanet:specification:domain:Shared:MonetaryAmountType:xsd:codelist:01.01" xmlns:uuom="urn:rosettanet:specification:universal:UnitOfMeasure:xsd:codelist:01.03" xmlns:dfe="urn:rosettanet:specification:domain:Procurement:ForecastEvent:xsd:codelist:01.03" xmlns:dst="urn:rosettanet:specification:domain:Procurement:ShipmentTerms:xsd:codelist:01.03" xmlns:udt="urn:rosettanet:specification:universal:DataType:xsd:schema:01.04" xmlns:dacc="urn:rosettanet:specification:domain:Procurement:AccountClassification:xsd:codelist:01.03" xmlns:dptt="urn:rosettanet:specification:domain:Logistics:PortType:xsd:codelist:01.03" xmlns:sha="urn:rosettanet:specification:domain:Shared:xsd:schema:01.10" xmlns:dlv="urn:rosettanet:specification:domain:Design:Level:xsd:codelist:01.02" xmlns:rict="urn:rosettanet:specification:domain:Shared:InvoiceChargeType:xsd:codelist:01.02" xmlns:utt="urn:rosettanet:specification:universal:TaxType:xsd:codelist:01.02" xmlns:ddwsr="urn:rosettanet:specification:domain:Marketing:DesignWinStatusReason:xsd:codelist:01.03" xmlns:dsm="urn:rosettanet:specification:domain:Logistics:ShipmentMode:xsd:codelist:01.05" xmlns:udct="urn:rosettanet:specification:universal:DocumentType:xsd:codelist:01.09" xmlns:dac="urn:rosettanet:specification:domain:Design:ActionCode:xsd:codelist:01.03" xmlns:dpsr="urn:rosettanet:specification:domain:Procurement:ProductSubstitutionReason:xsd:codelist:01.03" xmlns:sft="urn:rosettanet:specification:system:TPIRFileType:xsd:codelist:01.01" xmlns:dltcc="urn:rosettanet:specification:domain:Procurement:LeadTimeClassificationCode:xsd:codelist:01.03" xmlns:ri="urn:rosettanet:specification:domain:Shared:Interval:xsd:codelist:01.01" xmlns:urss="urn:rosettanet:specification:system:xml:1.0" xmlns:dds="urn:rosettanet:specification:domain:Design:xsd:schema:02.15" xmlns:dslt="urn:rosettanet:specification:domain:Procurement:SaleType:xsd:codelist:01.04" xmlns:udc="urn:rosettanet:specification:universal:Document:xsd:schema:01.08" xmlns:dabcc="urn:rosettanet:specification:domain:Design:ABCCode:xsd:codelist:01.02" xmlns:dppt="urn:rosettanet:specification:domain:Procurement:ProductProcurementType:xsd:codelist:01.03" xmlns:rwtc="urn:rosettanet:specification:domain:Shared:WarrantyType:xsd:codelist:01.01" xmlns:dlit="urn:rosettanet:specification:domain:Logistics:InstructionType:xsd:codelist:01.00" xmlns:rfob="urn:rosettanet:specification:domain:Shared:FreeOnBoard:xsd:codelist:01.01" xmlns:upri="urn:rosettanet:specification:universal:ProcessRoleIdentifier:xsd:codelist:01.08" xmlns:ddrn="urn:rosettanet:specification:domain:Marketing:DesignRegistrationNotification:xsd:codelist:01.02" xmlns:dsh="urn:rosettanet:specification:domain:Procurement:SpecialHandling:xsd:codelist:01.04" xmlns:ud="urn:rosettanet:specification:universal:Dates:xsd:schema:01.03" xmlns:dpms="urn:rosettanet:specification:domain:Marketing:ProjectMarketSegment:xsd:codelist:01.02" xmlns:rssl="urn:rosettanet:specification:domain:Shared:ShippingServiceLevel:xsd:codelist:01.01" xmlns:dldr="urn:rosettanet:specification:domain:Logistics:LotDiscrepancyReason:xsd:codelist:01.03" xmlns:rat="urn:rosettanet:specification:domain:Shared:AmountType:xsd:codelist:01.02" xmlns:upi="urn:rosettanet:specification:universal:PartnerIdentification:xsd:schema:01.12" xmlns:ddp="urn:rosettanet:specification:domain:Marketing:Disposition:xsd:codelist:01.02" xmlns:dsfr="urn:rosettanet:specification:domain:Procurement:SpecialFulfillmentRequest:xsd:codelist:01.03" xmlns:ucs="urn:rosettanet:specification:universal:CountrySubdivision:xsd:codelist:01.02 解决方法
最简单的快速破解解决方案是从文档中删除命名空间:
require 'nokogiri' xml = Nokogiri.XML "<root xmlns='foo' xmlns:bar='whee'><a/><bar:b /></root>" p xml.xpath('//b').length #=> 0 p xml.xpath('//bar:b').length #=> 1 p xml.xpath('//a').length #=> 0 xml.remove_namespaces! p xml.xpath('//a').length #=> 1 p xml.xpath('//b').length #=> 1 但是,如果您需要保留名称空间(例如,修改文档并重新保存文档,或者在各种名称空间中存在冲突的元素或属性名称),则上述内容不是有效的解决方案.如果你无法核对名称空间,你可以创建一个前缀并告诉Nokogiri它对应的内容…… xml = Nokogiri.XML "<root xmlns='foo' xmlns:bar='whee'><a/><bar:b /></root>" p xml.xpath('//x:a','x'=>'foo').length #=> 1 …其中字符串foo是文档中拥有元素的命名空间的URI,它具有默认命名空间(通常位于根目录下),字符串x是您想要的任何内容(与其他命名空间不冲突)已在您的文件中声明).或者,更简单地说,您可以使用xmlns作为默认命名空间的前缀: p xml.xpath('//xmlns:a').length #=> 1 或者,如果您需要保留名称空间并且可以构造一个合理的CSS样式选择器来获取您需要的节点,那么您可以使用css方法: require 'nokogiri' xml = Nokogiri.XML "<root xmlns='foo' xmlns:bar='whee'> <a/> <bar:b /> <c xmlns='jim'><d/></c> </root>" p xml.css('a').length,#=> 1 xml.css('b').length,#=> 0 xml.css('c').length,#=> 0 xml.css('d').length #=> 0 如上所示,请注意,这仅适用于与根元素位于同一名称空间的节点. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |