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xmlxsdxmllint

No matching global declaration available for the validation root

Background

Validate an XML document using a schema.

Problem

The simplest form of the problem is shown in two files.

XML Document file.xml

<?xml version="1.0"?>
<recipe xmlns:r="http://www.namespace.org/recipe">
  <r:description>
    <r:title>sugar cookies</r:title>
  </r:description>
</recipe>

XSD Document schema.xsd

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

  <xsd:complexType name="recipe">
    <xsd:choice>
      <xsd:element name="description" type="descriptionType"
        minOccurs="1" maxOccurs="1" />
    </xsd:choice>
  </xsd:complexType>

  <xsd:complexType name="descriptionType">
    <xsd:all>
      <xsd:element name="title">
        <xsd:simpleType>
          <xsd:restriction base="xsd:string">
            <xsd:minLength value="5" />
            <xsd:maxLength value="55" />
          </xsd:restriction>
        </xsd:simpleType>
      </xsd:element>
    </xsd:all>
  </xsd:complexType>
</xsd:schema>

Error

The full error message from xmllint:

$ xmllint --noout --schema schema.xsd file.xml

file.xml:2: element recipe: Schemas validity error : Element 'recipe': No matching global declaration available for the validation root. file.xml fails to validate

Question

What is the correct syntax (or what schema attributes are missing) to ensure that the given schema can be used to successfully validate the given XML document?

Solution

  • You need to change your XML instance. Your current one says that there is a type called description in the namespace http://www.namespace.org/recipe. However, in your XSD definition, the only types exposed in that namespace are called recipe and descriptionType.

    So either define a type called description in the XSD schema, or change your instance so you are referencing the recipe type correctly:

    File ns-changed.xml:

    <?xml version="1.0"?>
<r:recipe xmlns:r="http://www.namespace.org/recipe">
  <description>
    <title>sugar cookies</title>
  </description>
</r:recipe>

    UPDATE This is only half the solution - the other half is in @Aravind's answer here: https://stackoverflow.com/a/8426185/569662