<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           targetNamespace="http://linux.duke.edu/metadata/common"
           xmlns:common="http://linux.duke.edu/metadata/common"
           elementFormDefault="qualified"
           attributeFormDefault="unqualified">

  <!-- Define common dependency entry type -->
  <xs:complexType name="dependencyEntryType">
    <xs:attribute name="name" type="xs:string" />
    <xs:attribute name="flags" type="xs:string" />
    <xs:attribute name="epoch" type="xs:string" />
    <xs:attribute name="ver" type="xs:string" />
    <xs:attribute name="rel" type="xs:string" />
    <xs:attribute name="pre" type="xs:string" />
  </xs:complexType>

  <!-- Define common dependency container type -->
  <xs:complexType name="dependencyType">
    <xs:sequence>
      <xs:element name="entry" type="common:dependencyEntryType" minOccurs="0" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>

  <!-- Common namespace elements -->
  <xs:element name="license" type="xs:string" />
  <xs:element name="vendor" type="xs:string" />
  <xs:element name="group" type="xs:string" />
  <xs:element name="buildhost" type="xs:string" />
  <xs:element name="sourcerpm" type="xs:string" />

  <xs:element name="header-range">
    <xs:complexType>
      <xs:attribute name="start" type="xs:string" />
      <xs:attribute name="end" type="xs:string" />
    </xs:complexType>
  </xs:element>

  <xs:element name="provides" type="common:dependencyType" />
  <xs:element name="requires" type="common:dependencyType" />
  <xs:element name="recommends" type="common:dependencyType" />
  <xs:element name="conflicts" type="common:dependencyType" />
  <xs:element name="obsoletes" type="common:dependencyType" />
  <xs:element name="suggests" type="common:dependencyType" />

  <!-- Main metadata structure -->
  <xs:element name="metadata">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="package" minOccurs="0" maxOccurs="unbounded">
          <xs:complexType>
            <xs:all>
              <xs:element name="name" type="xs:string" minOccurs="0" />
              <xs:element name="arch" type="xs:string" minOccurs="0" />
              <xs:element name="version" minOccurs="0">
                <xs:complexType>
                  <xs:attribute name="epoch" type="xs:string" />
                  <xs:attribute name="ver" type="xs:string" />
                  <xs:attribute name="rel" type="xs:string" />
                </xs:complexType>
              </xs:element>
              <xs:element name="checksum" minOccurs="0">
                <xs:complexType>
                  <xs:simpleContent>
                    <xs:extension base="xs:string">
                      <xs:attribute name="type" type="xs:string" />
                      <xs:attribute name="pkgid" type="xs:string" />
                    </xs:extension>
                  </xs:simpleContent>
                </xs:complexType>
              </xs:element>
              <xs:element name="time" minOccurs="0">
                <xs:complexType>
                  <xs:attribute name="file" type="xs:string" />
                  <xs:attribute name="build" type="xs:string" />
                </xs:complexType>
              </xs:element>
              <xs:element name="size" minOccurs="0">
                <xs:complexType>
                  <xs:attribute name="package" type="xs:string" />
                  <xs:attribute name="installed" type="xs:string" />
                  <xs:attribute name="archive" type="xs:string" />
                </xs:complexType>
              </xs:element>
              <xs:element name="location" minOccurs="0">
                <xs:complexType>
                  <xs:attribute name="href" type="xs:string" />
                </xs:complexType>
              </xs:element>
              <xs:element name="format" minOccurs="0">
                <xs:complexType>
                  <xs:choice minOccurs="0" maxOccurs="unbounded">
                    <!-- Allow any elements from rpm namespace or common namespace -->
                    <xs:any namespace="http://linux.duke.edu/metadata/rpm http://linux.duke.edu/metadata/common ##local" processContents="lax" />
                  </xs:choice>
                </xs:complexType>
              </xs:element>
              <xs:element name="summary" type="xs:string" minOccurs="0" />
              <xs:element name="description" type="xs:string" minOccurs="0" />
              <xs:element name="packager" type="xs:string" minOccurs="0" />
              <xs:element name="url" type="xs:string" minOccurs="0" />
            </xs:all>
            <xs:attribute name="type" type="xs:string" />
          </xs:complexType>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="packages" type="xs:string" />
    </xs:complexType>
  </xs:element>

</xs:schema>