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This test suite checks GeoPackage 1.2 files for standards conformance.
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# RELAX NG Compact Syntax Grammar for the Atom Format Specification 
# See 

   namespace atom = "http://www.w3.org/2005/Atom"
   namespace xhtml = "http://www.w3.org/1999/xhtml"
   namespace s = "http://www.ascc.net/xml/schematron"
   namespace local = ""

   start = atomFeed | atomEntry

   atomCommonAttributes =
      attribute xml:base { atomUri }?,
      attribute xml:lang { atomLanguageTag }?,
      undefinedAttribute*

   atomPlainTextConstruct =
      atomCommonAttributes,
      attribute type { "text" | "html" }?,
      text

   atomXHTMLTextConstruct =
      atomCommonAttributes,
      attribute type { "xhtml" },
      xhtmlDiv

   atomTextConstruct = atomPlainTextConstruct | atomXHTMLTextConstruct

   atomPersonConstruct =
      atomCommonAttributes,
      (element atom:name { text }
       & element atom:uri { atomUri }?
       & element atom:email { atomEmailAddress }?
       & extensionElement*)

   atomDateConstruct =
      atomCommonAttributes,
      xsd:dateTime

   atomFeed =
      [
         s:rule [
            context = "atom:feed"
            s:assert [
               test = "atom:author or not(atom:entry[not(atom:author)])"
               "An atom:feed must have an atom:author unless all "
               ~ "of its atom:entry children have an atom:author."
            ]
         ]
      ]
      element atom:feed {
         atomCommonAttributes,
         (atomAuthor*
          & atomCategory*
          & atomContributor*
          & atomGenerator?
          & atomIcon?
          & atomId
          & atomLink*
          & atomLogo?
          & atomRights?
          & atomSubtitle?
          & atomTitle
          & atomUpdated
          & extensionElement*),
         atomEntry*
      }

   atomEntry =
      [
         s:rule [
            context = "atom:entry"
            s:assert [
               test = "atom:link[@rel='alternate'] "
               ~ "or atom:link[not(@rel)] "
               ~ "or atom:content"
               "An atom:entry must have at least one atom:link element "
               ~ "with a rel attribute of 'alternate' "
               ~ "or an atom:content."
            ]
         ]
         s:rule [
            context = "atom:entry"
            s:assert [
               test = "atom:author or "
               ~ "../atom:author or atom:source/atom:author"
               "An atom:entry must have an atom:author "
               ~ "if its feed does not."
            ]
         ]
      ]
      element atom:entry {
         atomCommonAttributes,
         (atomAuthor*
          & atomCategory*
          & atomContent?
          & atomContributor*
          & atomId
          & atomLink*
          & atomPublished?
          & atomRights?
          & atomSource?
          & atomSummary?
          & atomTitle
          & atomUpdated
          & extensionElement*)
      }

   atomInlineTextContent =
      element atom:content {
         atomCommonAttributes,
         attribute type { "text" | "html" }?,
         (text)*
      }

   atomInlineXHTMLContent =
      element atom:content {
         atomCommonAttributes,
         attribute type { "xhtml" },
         xhtmlDiv
      }

   atomInlineOtherContent =
      element atom:content {
         atomCommonAttributes,
         attribute type { atomMediaType }?,
         (text|anyElement)*
      }

   atomOutOfLineContent =
      element atom:content {
         atomCommonAttributes,
         attribute type { atomMediaType }?,
         attribute src { atomUri },
         empty
      }

   atomContent = atomInlineTextContent
    | atomInlineXHTMLContent
    | atomInlineOtherContent
    | atomOutOfLineContent

   atomAuthor = element atom:author { atomPersonConstruct }

   # atom:category

   atomCategory =
      element atom:category {
         atomCommonAttributes,
         attribute term { text },
         attribute scheme { atomUri }?,
         attribute label { text }?,
         undefinedContent
      }

   atomContributor = element atom:contributor { atomPersonConstruct }

   atomGenerator = element atom:generator {
      atomCommonAttributes,
      attribute uri { atomUri }?,
      attribute version { text }?,
      text
   }

   atomIcon = element atom:icon {
      atomCommonAttributes,
      (atomUri)
   }

   atomId = element atom:id {
      atomCommonAttributes,
      (atomUri)
   }

   atomLogo = element atom:logo {
      atomCommonAttributes,
      (atomUri)
   }

   atomLink =
      element atom:link {
         atomCommonAttributes,
         attribute href { atomUri },
         attribute rel { atomNCName | atomUri }?,
         attribute type { atomMediaType }?,
         attribute hreflang { atomLanguageTag }?,
         attribute title { text }?,
         attribute length { text }?,
         undefinedContent
      }

   atomPublished = element atom:published { atomDateConstruct }

   atomRights = element atom:rights { atomTextConstruct }

   atomSource =
      element atom:source {
         atomCommonAttributes,
         (atomAuthor*
          & atomCategory*
          & atomContributor*
          & atomGenerator?
          & atomIcon?
          & atomId?
          & atomLink*
          & atomLogo?
          & atomRights?
          & atomSubtitle?
          & atomTitle?
          & atomUpdated?
          & extensionElement*)
      }

   atomSubtitle = element atom:subtitle { atomTextConstruct }

   atomSummary = element atom:summary { atomTextConstruct }

   atomTitle = element atom:title { atomTextConstruct }

   atomUpdated = element atom:updated { atomDateConstruct }

   atomNCName = xsd:string { minLength = "1" pattern = "[^:]*" }

   # Whatever a media type is, it contains at least one slash
   atomMediaType = xsd:string { pattern = ".+/.+" }

   # As defined in RFC 3066
   atomLanguageTag = xsd:string {
      pattern = "[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*"
   }

   # Unconstrained; it's not entirely clear how IRI fit into
   # xsd:anyURI so let's not try to constrain it here
   atomUri = text

   # Whatever an email address is, it contains at least one @
   atomEmailAddress = xsd:string { pattern = ".+@.+" }

   simpleExtensionElement =
      element * - atom:* {
         text
      }

   structuredExtensionElement =
      element * - atom:* {
         (attribute * { text }+,
            (text|anyElement)*)
       | (attribute * { text }*,
          (text?, anyElement+, (text|anyElement)*))
      }

   extensionElement =
      simpleExtensionElement | structuredExtensionElement

   undefinedAttribute =
     attribute * - (xml:base | xml:lang | local:*) { text }

   undefinedContent = (text|anyForeignElement)*

   anyElement =
      element * {
         (attribute * { text }
          | text
          | anyElement)*
      }

   anyForeignElement =
      element * - atom:* {
         (attribute * { text }
          | text
          | anyElement)*
      }

   anyXHTML = element xhtml:* {
      (attribute * { text }
       | text
       | anyXHTML)*
   }

   xhtmlDiv = element xhtml:div {
      (attribute * { text }
       | text
       | anyXHTML)*
   }