schema.rnc

# default namespace = ""

b = element b { MarkupText }
i = element i { MarkupText }
url = element url {
  attribute type { xsd:NCName }? & xsd:anyURI
}
fixed-case = element fixed-case { MarkupText }
tex-math = element tex-math { text }
MarkupText = (text | b | i | url | fixed-case | tex-math )+

first = element first { xsd:string { pattern="(\S(.*\S)?)?" } }
last = element last { xsd:string { pattern="\S(.*\S)?" } }
affiliation = element affiliation { text }
Variant = element variant { attribute script { xsd:string }, (first? & last) }
# Store bare 16-digit hyphenated ORCID iD with checksum (last char may be X)
OrcidId = xsd:string { pattern="([0-9]{4}-){3}[0-9]{3}[0-9X]" }

Person =
  attribute id { xsd:NCName }?,
  attribute orcid { OrcidId }?,
  (first? & last & Variant? & affiliation?)

local-filename = xsd:string { pattern="[A-Za-z0-9._\-]+" }
bibtex-key = xsd:string { pattern="[A-Za-z0-9\-]+" }
checksum = attribute hash { xsd:string {minLength="8" maxLength="8" pattern="[0-9a-f]*"} }
url-with-checksum = element url {
    xsd:anyURI {pattern="https?://.*"} |
    (local-filename, checksum)
}
attachment = element attachment {
    attribute type { xsd:NCName }?,
    checksum,
    local-filename
}

Revision = element revision {
  attribute id { xsd:positiveInteger },
  attribute href { local-filename },
  attribute date { xsd:date }?,
  checksum,
  text
}

Talk = element talk {
  attribute type { xsd:string }?,
  (element title { MarkupText }
   & element speaker { Person }*
   & url?
  )
 }

Paper = element paper {
  attribute id { xsd:positiveInteger },
  attribute ingest-date { xsd:date }?,
  attribute type { xsd:string }?,
  (element abstract { MarkupText }?
   & attachment*
   & element bibkey { bibtex-key }
   & element author { Person }*
   & element doi { xsd:anyURI }?
   & element editor { Person }*
   & Revision*
   & element erratum {
       attribute id { xsd:positiveInteger },
       attribute date { xsd:date }?,
       checksum,
       local-filename
     }*
   & element retracted {
       attribute date { xsd:date },
       text
     }?
   & element removed {
       attribute date { xsd:date },
       text
     }?
   & element issue { xsd:nonNegativeInteger }?
   & element journal { text }?
   & element mrf {
       attribute src { xsd:NCName },
       xsd:NCName
     }?
   & element note { text }?
   & element pages { text }?
   & element title { MarkupText }
   & url-with-checksum?
   & element video {
       attribute href { xsd:anyURI },
       attribute permission { xsd:boolean }?
     }*
   & element language { xsd:language }?
   & element award { text }*
   )
}
Meta = element meta {
  (element booktitle { MarkupText }
   & element shortbooktitle { MarkupText }?
   & element editor { Person }*
   & element publisher { text }?
   & element address { text }?
   & element month { text }?
   & element year { xsd:gYear }
   & element isbn { xsd:NMTOKEN }?
   & url-with-checksum?
   & element doi { xsd:anyURI }?
   & element venue { text }+
   & element journal-volume { xsd:string }?
   & element journal-issue { xsd:string }?
   & element journal-title { xsd:string }?
  )
}
Frontmatter = element frontmatter {
  (url-with-checksum?
   & element pages { text }?
   & element bibkey { bibtex-key }
   & Revision*
   & attachment*
   & element doi { xsd:anyURI }?
  )
}
Volume = element volume {
  attribute id { xsd:string },
  attribute type { "journal" | "proceedings" },
  attribute ingest-date { xsd:date }?,
  Meta,
  Frontmatter?,
  Paper*
}
Event = element event {
  attribute id { xsd:string },
  (element meta {
    (element title { MarkupText }?
     & element location { text }?
     & element dates { text }?
    )
  }?
   & element links { url* }?
   & Talk*
   & element colocated {
       element volume-id { text }*
     }?
 )
}
Collection = element collection {
  attribute id { xsd:string },
  Volume*,
  Event?
}
start = Collection