include "docbook.rnc" {

# redefine citation element 
  citation = element citation {
     para.char.mix*,
     biblioref*,
     citation?,
     citation.attlist
  }
  citation.attlist &=
    common.attrib,
    citation.role.attrib,
    local.citation.attrib,
    attribute renderas {
      "full" | "author" | "year" | "title"
    }?,
    attribute caption { text }?

# redefine blockquote element
  blockquote = element blockquote {
    title?,
    attribution?,
    component.mix+,
    biblioref?,
    blockquote.attlist
  }
  blockquote.attlist &=
    common.attrib,
    blockquote.role.attrib,
    local.blockquote.attrib

# redefine quote element
  local.quote.attrib = quote.role.attrib
  quote.role.attrib = role.attrib

  quote = element quote {
    para.char.mix+,
    biblioref?,
    quote.attlist
  }
  quote.attlist &=
    common.attrib,
    quote.role.attrib,
    local.quote.attrib

# redefine epigraph element
  local.epigraph.attrib = epigraph.role.attrib
  epigraph.role.attrib = role.attrib

  epigraph = element epigraph {
    attribution?,
    para.class+,
    biblioref?,
    epigraph.attlist
  }
}

# define new biblioref element
biblioref = element biblioref {
  biblioref.attlist
}
biblioref.attlist &=
    attribute linkend { xsd:IDREF },
    attribute endterm { xsd:IDREF }?,
    attribute renderas {
      "full" | "author" | "year" | "title"
    }?,
    attribute unit { xsd:token }?,
    attribute start {xsd:token }?,
    attribute stop { xsd:token }?,
    attribute caption { text }?