default namespace = ""
namespace xsi = "http://www.w3.org/2001/XMLSchema-instance"

start =
  element standard_name_table {
    attribute xsi:noNamespaceSchemaLocation { xsd:NCName },
    element version_number { xsd:integer },
    element last_modified { xsd:dateTime },
    element institution { "Program for Climate Model Diagnosis and Intercomparison" },
    element contact { "webmaster@pcmdi.llnl.gov" },
    element entry {
      attribute id { xsd:NCName { pattern = "[a-z][_a-z0-9]+[a-z0-9]" } },
      element canonical_units { text }?,
      element grib { xsd:string { pattern = "([0-9]{1,3} )?[NE]?[0-9]{1,3}" } }?,
      element amip { xsd:NCName { pattern = "[a-z]+[0-9]?" } }?,
      element description { text }?
    }+,
    element alias {
      attribute id { text },
      element entry_id { xsd:NCName }
    }+
  }