CODEWITHSUNDEEP
xmlxsdxsd-validation
Jims
Jims

Reputation: 68

XSD: Child's name is the name of parent's attribute

Is it possible to validate the following XML, where the parent's child name is it's attribute "name":

<root>
  <parent name="foo">
    <foo/>
  </parent>
  <parent name="bar">
    <bar/>
  </parent>
  <parent name="abc">
    <xyz/> <!-- invalid -->
  </parent>
</root>

The XSD, as per request:

<xsd:schema elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:complexType name="parentType">
    <xsd:sequence>
      <!-- TODO: enforce element name same as it's parent's attribute "name" -->
    </xsd:sequence>
    <xsd:attribute name="name" type="xsd:string" use="required"/>
  </xsd:complexType>

  <xsd:element name="root">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="parent" type="parentType"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

</xsd:schema>

The "TODO" is where I'm stumped. Thanks in advance for any help!

Upvotes: 1

Views: 153

Answers (2)

C. M. Sperberg-McQueen
C. M. Sperberg-McQueen

Reputation: 25054

Is this an exercise in seeing what can go wrong when you violate the rule "Don't Repeat Yourself" in XML?

Upvotes: 0

kjhughes
kjhughes

Reputation: 111756

In XSD 1.0, you cannot specify such a constraint directly, but you could specify it using Schematron or check it at the application level.

In XSD 1.1, you could use xsd:assert:

<?xml version="1.0" encoding="utf-8"?>
<xsd:schema elementFormDefault="qualified"
            xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:complexType name="parentType">
    <xsd:sequence>
      <xsd:any processContents="lax" minOccurs="1" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="xsd:string" use="required"/>
    <xsd:assert test="@name = local-name(*[1])"/>
  </xsd:complexType>

  <xsd:element name="root">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="parent" type="parentType" maxOccurs="unbounded"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

</xsd:schema>

Upvotes: 1

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