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Verify that the attribute is unique using XSD in an XML document

I am trying to verify that the attribute is unique for all elements that exist in an XML document.

XML example:

<exampleXml> <a id="1"/> <a id="2"> <b id="1"/> </a> </exampleXml>

My XSD scheme:

 <xs:schema elementFormDefault="qualified"> <xs:element name="exampleXml"> <xs:complexType> <xs:sequence> <xs:element minOccurs="0" maxOccurs="unbounded" name="a"> <xs:complexType> <xs:complexContent> <xs:extension base="baseRuleType"> <xs:sequence> <xs:element minOccurs="0" maxOccurs="1" name="b"> <xs:complexType> <xs:complexContent> <xs:extension base="baseRuleType"/> </xs:complexContent> </xs:complexType> </xs:element> </xs:sequence> </xs:extension> </xs:complexContent> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> <xs:unique name="duplicateIdsForbidden"> <xs:selector xpath="//"/> <xs:field xpath="@id"/> </xs:unique> </xs:element> <xs:complexType name="baseRuleType"> <xs:attribute name="id" use="optional"/> </xs:complexType> </xs:schema>

The xpath problem is here. I want to map each element as root, but the above xpath is above:

  Element '{http://www.w3.org/2001/XMLSchemaasureselector', attribute 'xpath': 
 The XPath expression '//' could not be compiled

I can change the xpath to "*", but this will only check the id attribute on elements that are direct root counts.

I check this with lib_xml in PHP using DOMDocument::schemaValidate() . Any help was greatly appreciated.

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1 answer

Use <xs:selector xpath=".//*"/> .

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Source: https://habr.com/ru/post/892822/

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