namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
default namespace mstns = "http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd"
namespace rng = "http://relaxng.org/ns/structure/1.0"

dependency =
  attribute id { xsd:string },
  attribute version { xsd:string }?,
  attribute include { xsd:string }?,
  attribute exclude { xsd:string }?
dependencyGroup =
  element dependency { dependency }*,
  attribute targetFramework { xsd:string }?
reference = attribute file { xsd:string }
contentFileEntries =
  attribute include { xsd:string },
  attribute exclude { xsd:string }?,
  attribute buildAction { xsd:string }?,
  attribute copyToOutput { xsd:boolean }?,
  attribute flatten { xsd:boolean }?
referenceGroup =
  element reference { reference }+,
  attribute targetFramework { xsd:string }?
frameworkReference = attribute name { xsd:string }
frameworkReferenceGroup =
  element frameworkReference { frameworkReference }*,
  attribute targetFramework { xsd:string }
start |= starting_package
starting_package =
  element package {
    element metadata {
      (element id { xsd:string }
       & element version { xsd:string }
       & element title { xsd:string }?
       & element authors { xsd:string }
       & element owners { xsd:string }?
       & element licenseUrl { xsd:anyURI }?
       & element projectUrl { xsd:anyURI }?
       & element iconUrl { xsd:anyURI }?
       & element requireLicenseAcceptance { xsd:boolean }?
       & element developmentDependency { xsd:boolean }?
       & element description { xsd:string }
       & element summary { xsd:string }?
       & element releaseNotes { xsd:string }?
       & (element copyright { xsd:string }?)
         >> a:documentation [
              "\x{a}" ~
              "            default value is : en-US"
            ]
       & element language { xsd:string }?
       & element tags { xsd:string }?
       & element serviceable { xsd:boolean }?
       & element icon { xsd:string }?
       & element readme { xsd:string }?
       & element repository {
           attribute type { xsd:string }?,
           attribute url { xsd:anyURI }?,
           attribute branch { xsd:string }?,
           attribute commit { xsd:string }?
         }?
       & element license {
           xsd:string,
           attribute type { xsd:string },
           attribute version { xsd:string }?
         }?
       & element packageTypes {
           element packageType {
             attribute name { xsd:string },
             attribute version { xsd:string }?
           }*
         }?
       & element dependencies {
           (element dependency { dependency }
            | element group { dependencyGroup })*
         }?
       & element frameworkAssemblies {
           element frameworkAssembly {
             attribute assemblyName { xsd:string },
             attribute targetFramework { xsd:string }?
           }*
         }?
       & element frameworkReferences {
           element group { frameworkReferenceGroup }*
         }?
       & element references {
           (element reference { reference }
            | element group { referenceGroup })*
         }?
       & element contentFiles {
           (element files { contentFileEntries })*
         }?),
      attribute minClientVersion { xsd:string }?
    },
    element files {
      element file {
        attribute src { xsd:string },
        attribute target { xsd:string }?,
        attribute exclude { xsd:string }?
      }*
    }?
  }