-- XSD schema extracted from ITU-T X.1520 (01/2014)

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns="http://cve.mitre.org/cve/downloads/1.0"
    targetNamespace="http://cve.mitre.org/cve/downloads/1.0"
    elementFormDefault="qualified" attributeFormDefault="unqualified" version="1.0">

  <!--  ************************************************************************** -->
  <!--  Changelog: 1.0 - Initial version -->
  <!--  ************************************************************************** -->
  <xsd:annotation>
    <xsd:documentation xml:lang="en">
      Simple schema that defines the format of the CVE List provided by MITRE
    </xsd:documentation>
  </xsd:annotation>

  <!--  ************************************************************************** -->
  <!--  Start Item Element Definition -->
  <!--  ************************************************************************** -->
  <xsd:element name="cve">
    <xsd:annotation>
      <xsd:documentation xml:lang="en">
        cve is the top level element of the CVE List provided by MITRE.
        It represents holds all CVE Items.
      </xsd:documentation>
    </xsd:annotation>
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="item" type="ItemType" minOccurs="1" maxOccurs="unbounded"/>
      </xsd:sequence>
      <xsd:attribute name="schemaVersion" type="xsd:token" use="optional"/>
    </xsd:complexType>
  </xsd:element>

  <!--  ************************************************************************** -->
  <!--  Simple Types -->
  <!--  ************************************************************************** -->
  <!-- CUSTOM TYPE DEFINITIONS-->
  <xsd:simpleType name="typeEnumType">
    <xsd:restriction base="xsd:token">
      <xsd:enumeration value="CAN"/>
      <xsd:enumeration value="CVE"/>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:simpleType name="statusEnumType">
    <xsd:restriction base="xsd:token">
      <xsd:enumeration value="Entry"/>
      <xsd:enumeration value="Candidate"/>
    </xsd:restriction>
  </xsd:simpleType>

  <!-- need to verify enumeration -->
  <xsd:simpleType name="simplePhaseEnumType">
    <xsd:restriction base="xsd:token">
      <xsd:enumeration value="Proposed"/>
      <xsd:enumeration value="Interim"/>
      <xsd:enumeration value="Modified"/>
      <xsd:enumeration value="Assigned"/>
    </xsd:restriction>
  </xsd:simpleType>

  <!--  **************************************************************************** -->
  <!--  Complex Types -->
  <!--  **************************************************************************** -->
  <xsd:complexType name="ItemType">
    <xsd:sequence>
      <xsd:element name="status" type="statusEnumType" minOccurs="1" maxOccurs="1"/>
      <xsd:element name="phase" type="specificPhaseType" minOccurs="0" maxOccurs="1"/>
      <xsd:element name="desc" type="xsd:string" minOccurs="1" maxOccurs="1"/>
      <xsd:element name="refs" type="refsType" minOccurs="1" maxOccurs="1"/>
      <xsd:element name="votes" type="votesType" minOccurs="0" maxOccurs="1"/>
      <xsd:element name="comments" type="commentsType" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
    <!--Need to Verify Enumeration-->
    <xsd:attribute name="type" type="typeEnumType" use="required"/>
    <xsd:attribute name="name" type="xsd:token" use="required"/>
    <xsd:attribute name="seq" type="xsd:token" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="commentsType">
    <xsd:sequence>
      <xsd:element name="comment" minOccurs="0" maxOccurs="unbounded">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="voter" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="votesType">
    <xsd:sequence>
      <xsd:element name="accept" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="modify" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="noop" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="recast" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="reject" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="reviewing" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
      <xsd:element name="revote" minOccurs="0" maxOccurs="1">
        <xsd:complexType>
          <xsd:simpleContent>
            <xsd:extension base="xsd:string">
              <xsd:attribute name="count" type="xsd:token" use="required"/>
            </xsd:extension>
          </xsd:simpleContent>
        </xsd:complexType>
      </xsd:element>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="specificPhaseType">
    <xsd:simpleContent>
      <xsd:extension base="simplePhaseEnumType">
        <xsd:attribute name="date" type="xsd:token" use="optional"/>
      </xsd:extension>
    </xsd:simpleContent>
  </xsd:complexType>

  <xsd:complexType name="refsType">
    <xsd:annotation>
      <xsd:documentation>holds all hyperlink elements</xsd:documentation>
    </xsd:annotation>
    <xsd:sequence>
      <xsd:element name="ref" type="refType" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="refType">
    <xsd:annotation>
      <xsd:documentation>Holds individual hyperlink element</xsd:documentation>
    </xsd:annotation>
    <xsd:simpleContent>
      <xsd:extension base="xsd:string">
        <xsd:attribute name="source" type="xsd:token" use="required"/>
        <xsd:attribute name="url" type="xsd:anyURI" use="optional"/>
      </xsd:extension>
    </xsd:simpleContent>
  </xsd:complexType>
</xsd:schema>