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我试图让我的XML模式处理一点追踪功能，因为我在阅读某些功能规范时收集了需求。 （不理想的需求管理，但至少它是一个开始。）XSD的可追溯性
我在做什么是创造我正在读通过每一个功能规范< functionalSpec>标签。我为每个需求创建一个< 要求>标签。由于我希望能够跟踪需求来自何处，因此我创建了一个元素，其中元素为< 10功能规格>元素。我不希望自己在标签中输入任何普通旧文本，而是希望XSD验证并确保我只输入存在现有功能规范的ID。我的问题即将到来，看起来XML Schema W3C Recommendations文档说，我想要做的是不可能的。 （约1/2一路下滑）
{selector} specifies a restricted XPath ([XPath]) expression relative to instances of the element being declared. This must identify a node set of subordinate elements (i.e. contained within the declared element) to which the constraint applies.
我用氧气来创建这个，因为我是相当新的XSD文件，它给我下面的错误：
E [Xerces] Identity Constraint error: identity constraint "[email protected]" has a keyref which refers to a key or unique that is out of scope.
所以我问题是否有人知道一种方法可以让我通过使用XSD使用下面的相同XML结构？
以下是XML文件。
<?xml version="1.0" encoding="UTF-8" ?>
<srs xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="srs req2.xsd"
xmlns="srs">
<requirements>
<requirement DateCreated="2010-06-11" id="1">
<Text>The system shall...</Text>
<trace>
<functionalSpecId>B010134</functionalSpecId>
</trace>
<revisions>
<revision date="2010-06-11" num="0">
<description>Initial creation.</description>
</revision>
</revisions>
</requirement>
</requirements>
<functionalSpecs>
<functionalSpec id="B010134" model="Model-T">
<trace>
<meeting></meeting>
</trace>
<revisions>
<revision date="2009-07-08" num="0">
<description>Initial creation.</description>
</revision>
<detailer>Me</detailer>
<engineer>Me</engineer>
</revisions>
</functionalSpec>
</functionalSpecs>
</srs>
下面是XSD文件。
<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="srs"
xmlns="srs"
xmlns:srs="srs"
elementFormDefault="qualified">
<!-- SRS -->
<xs:element name="srs" type="SRSType">
</xs:element>
<xs:complexType name="SRSType">
<xs:sequence>
<xs:element ref="requirements" />
<xs:element ref="functionalSpecs" />
</xs:sequence>
</xs:complexType>
<!-- Requirements -->
<xs:element name="requirements" type="RequirementsType">
<xs:unique name="requirementId">
<xs:selector xpath="srs/requirements/requirement" />
<xs:field xpath="@id" />
</xs:unique>
</xs:element>
<xs:complexType name="RequirementsType">
<xs:choice maxOccurs="unbounded">
<xs:element name="requirement" type="RequirementType" />
</xs:choice>
</xs:complexType>
<xs:complexType name="RequirementType">
<xs:complexContent>
<xs:extension base="RequirementInfo">
<xs:sequence>
<xs:element name="trace" type="TraceType" maxOccurs="unbounded" minOccurs="1" />
<xs:element name="revisions" type="RequirementRevisions" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="RequirementRevisions">
<xs:sequence>
<xs:element name="revision" type="RevisionInfo" minOccurs="1" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="RequirementInfo">
<xs:sequence>
<xs:element name="Text" type="Description" />
</xs:sequence>
<xs:attribute name="DateCreated" type="xs:date" use="required" />
<xs:attribute name="id" type="xs:integer" use="required" />
</xs:complexType>
<!-- Functional Specs -->
<xs:element name="functionalSpecs" type="FunctionalSpecsType">
<xs:unique name="functionalSpecId">
<xs:selector xpath="srs/functionalSpecs/functionalSpec" />
<xs:field xpath="@id" />
</xs:unique>
</xs:element>
<xs:complexType name="FunctionalSpecsType">
<xs:choice maxOccurs="unbounded">
<xs:element name="functionalSpec" type="FunctionalSpecType" />
</xs:choice>
</xs:complexType>
<xs:complexType name="FunctionalSpecType">
<xs:complexContent>
<xs:extension base="FunctionalSpecInfo">
<xs:sequence>
<xs:element name="trace" type="TraceType" maxOccurs="unbounded" minOccurs="1" />
<xs:element name="revisions" type="FunctionalSpecRevisions" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="FunctionalSpecRevisions">
<xs:sequence>
<xs:element name="revision" type="RevisionInfo" minOccurs="1" maxOccurs="unbounded" />
<xs:element name="detailer" type="xs:string" />
<xs:element name="engineer" type="xs:string" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="FunctionalSpecInfo">
<xs:attribute name="id" type="xs:string" use="required" />
<xs:attribute name="model" type="xs:string" use="required" />
</xs:complexType>
<!-- Requirements, Functional Specs -->
<xs:complexType name="TraceType">
<xs:choice>
<xs:element name="requirementId">
<xs:keyref refer="requirementId" name="requirementIdRef">
<xs:selector xpath="srs/requirements/requirement" />
<xs:field xpath="@id" />
</xs:keyref>
</xs:element>
<xs:element name="functionalSpecId">
<xs:keyref refer="functionalSpecId" name="functionalSpecIdRef">
<xs:selector xpath="srs/functionalSpecs/functionalSpec" />
<xs:field xpath="@id" />
</xs:keyref>
</xs:element>
<xs:element name="meeting" />
</xs:choice>
</xs:complexType>
<!-- Common -->
<xs:complexType name="RevisionInfo">
<xs:choice>
<xs:element name="description" type="Description" />
</xs:choice>
<xs:attribute name="date" type="xs:date" use="required" />
<xs:attribute name="num" type="xs:integer" use="required" />
</xs:complexType>
<xs:complexType name="Description" mixed="true">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="Date" type="xs:date" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:schema>