This file is indexed.

/usr/share/perl5/Biber/config.rnc is in biber 1.8-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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start = element config {
  element clrmacros           { "0" | "1" }? &
  element collate             { "0" | "1" }? &
  element collate_options     {
    element option {
      attribute name { text } &
      attribute value { text }
    }+
  }? &
# Can't specify the config file location in the config file ...
#  element configfile          { text }? & 
  element convert_control     { "0" | "1" }? &
  element dot_include         { text }? &
  # Data model specification
  element datamodel {
    # Valid entrytypes
    element entrytypes {
      element entrytype {
        # Some entrytypes should be completely skipped on output (XDATA etc.)
        attribute skip_output { "true" }?,
        text
      }+
    },
    # BibLaTeX field types. Biber uses this to determine how to output various types
    # to the .bbl
    element fields {
      element field {
        # fieldtype is "field" or "list"
        attribute fieldtype { "field" | "list" },
        # format is a specification of the format of the field. If not specified, field contents
        # are just as is. 
        attribute format { "csv" }?,
        # datatype of field content
        attribute datatype { "literal" | "name" | "key" | "entrykey" | "date" | "verbatim" | "integer" | "range" | "csv" | "code" | "uri" | "datepart" | "keyword" | "option" },
        # Are we allowed to output a null field value to the .bbl for this field?
        attribute nullok { "true" }?,
        # Should this field be skipped and not output to the .bbl?
        attribute skip_output { "true" }?,
        text
      }+
    },
    # Allowable fields for entrytypes
    # Only one specification per entrytype: even though it might be nice to have several 
    # so that one could share information, this would be hard to manage and confusing as it
    # not be visible in one place which fields were valid for an entrytype.
    element entryfields {
      element entrytype { text }*,
      element field { text }+
    }+,
    # Constraints on field (co-)existence and format
    element constraints {
      # Set of entrytypes that this constraint applies to
      # An entrytype can be specified in multiple constraints
      #
      element entrytype { text }*,
      # A constraint specification
      element constraint {
        (
          # Conditional constraints have an antecedent and consequent
          # both of which have a quantifier. This allows you to enforce
          # constraints like:
          #
          # if field a,b,c are all present then one of x,y,z must be
          # if one of field a,b,c are present then none of x,y,z must be
          # etc.
          (attribute type { "conditional" },
            element antecedent {
              attribute quant { "all" | "one" | "none"},
              element field { text }+
            },
            element consequent {
              attribute quant { "all" | "one" | "none"},
              element field { text }+
            }
          ) |
          # Datatype and format constraints
          (attribute type { "data" },
            # range* attributes are for limiting integer type range
            attribute datatype { "integer" | "isbn" | "issn" | "ismn" | "date" | "pattern" }?,
            attribute rangemin { xsd:int }?,
            attribute rangemax { xsd:int }?,
            attribute pattern { text }?,
            element field { text }+
          ) |
          # Mandatoriness constraints which say which fields must appear
          (attribute type { "mandatory" },
            (element field { text } |
              # An XOR set of fields so you can enforce:
              #
              # One (but not more) of fields a,b,c must exist
              element fieldxor {
                element field { text }+
              } |
              # An OR set of fields so you can enforce:
              #
              # One (possibly more) of fields a,b,c must exist
              element fieldor {
                element field { text }+
              }
            )+
          )
        )
      }*
    }+
  }? &
  element decodecharsset      { text }? &
  element debug               { "0" | "1" }? &
  element fastsort            { "0" | "1" }? &
  element fixinits            { "0" | "1" }? &
# Would never want this in the config file
#  element help                { "0" | "1" }? &
  inheritance? &
  element input_encoding      { text }? &
  element listsep             { text }? &
  element logfile             { text }? &
  element mincrossrefs        { xsd:unsignedByte }? &
  element mssplit             { text }? &
  element namesep             { text }? &
# Can't specify not to use a config file in the config file ...
#  element noconf              { "0" | "1" }? &
  element nodieonerror         { "0" | "1" }? &
  element nolog                { "0" | "1" }? &
  # noinit specification
  element noinit {
    element option {
      attribute value { xsd:string },
      empty
    }+
  }? &
  # nosort specification
  element nosort     {
    element option {
      attribute name { text } &
      attribute value { text }
    }+
  }? &
  element nostdmacros          { "0" | "1" }? &
  element onlylog              { "0" | "1" }? &
  element others_string        { text }? &
  element output_align         { "0" | "1" }? &
  element output_directory     { text }? &
  element output_encoding      { text }? &
  element output_fieldcase     { "upper" | "lower" | "title" }? &
  element output_file          { text }? &
  element output_format        { "bibtex" | "bbl" | "biblatexml" | "dot" }? &
  element output_indent        { xsd:unsignedByte }? &
  element output_macro_fields  { text }? &
  element output_resolve       { "0" | "1" }? &
  element output_safechars     { "0" | "1" }? &
  element output_safecharsset  { "base" | "full" }? &
  element quiet                { "0" | "1" }? &
  element recodedata           { text }? &
  element sortcase             { "0" | "1" }? &
  element sortfirstinits       { "0" | "1" }? &
  sorting? &
  element sortlocale           { text }? &
  element sortupper            { "0" | "1" }? &
  element sourcemap            {
    element maps {
      attribute datatype { "bibtex" | "biblatexml" | "ris" | "zoterordfxml" | "endnotexml" },
      attribute map_overwrite { "0" | "1" }?,
      map+
    }+
  }? &
  element ssl-nointernalca     { "0" | "1" }? &
  element ssl-noverify-host    { "0" | "1" }? &
  element tool                 { "0" | "1" }? &
  element tool_config          { text }? &
  element trace                { "0" | "1" }? &
  element validate_config      { "0" | "1" }? &
  element validate_control     { "0" | "1" }? &
  element validate_datamodel   { "0" | "1" }? &
# Meaningless in the config file
#  element version              { "0" | "1" }? &
  element wraplines            { "0" | "1" }?
}

inheritance =
    # Cross-reference inheritance specifications
    element inheritance {
      # Defaults
      element defaults {
        # Whether to inherit all fields
        attribute inherit_all { "true" | "false" },
        # Should we overwrite the target field if it exists?
        attribute override_target { "true" | "false" },
        # Default inherit_all and override_target settings for entrytype source/target pairs
        element type_pair {
          attribute source { "*" | xsd:string {minLength="1"}},
          attribute target { "*" | xsd:string {minLength="1"}},
          attribute inherit_all { "true" | "false" }?,
          attribute override_target { "true" | "false" }?,
          empty
        }*
      },
      # An inheritance specification
      element inherit {
        # applies to these pairs of source/target entrytypes
        element type_pair {
          attribute source { "*" | xsd:string {minLength="1"}},
          attribute target { "*" | xsd:string {minLength="1"}},
          empty
        }+,
        # and here are the field specifications
        element field {
          (
            # either a "skip this field" specification
            # so we can say inherit all except certain fields OR ...
            (attribute source { xsd:string },
              attribute skip { "true" | "false" }) |
            # ... a source and target field with an optional override attribute
            (attribute source { xsd:string {minLength="1"}},
              attribute target { xsd:string {minLength="1"}},
              attribute override_target { "true" | "false" }?)
          ),
          empty
        }+
      }*
    }



map =
  element map {
    attribute map_overwrite { "0" | "1" }?,
    element per_datasource { xsd:string {minLength="1"} }*,
    element per_type { xsd:string {minLength="1"} }*,
    element map_step {
      (
        (
          attribute map_entry_null { "1" }
        ) |
        (
          attribute map_type_source { xsd:string {minLength="1"} },
          attribute map_type_target { xsd:string {minLength="1"} }?,
          attribute map_final { "1" }?
        ) |
        (
          attribute map_field_source { xsd:string {minLength="1"} },
          attribute map_field_target { xsd:string {minLength="1"} }?,
          attribute map_final { "1" }?,
          attribute map_match { xsd:string {minLength="1"} }?,
          attribute map_notmatch { xsd:string {minLength="1"} }?,
          attribute map_replace { xsd:string {minLength="1"} }?
        ) |
        (
          attribute map_field_set { xsd:string {minLength="1"} },
          attribute map_append { "1" }?,
          attribute map_final { "1" }?,
          ( attribute map_null { "1" } |
            attribute map_origfield { "1" } |
            attribute map_origfieldval { "1" } |
            attribute map_origentrytype { "1" } |
            attribute map_field_value { xsd:string {minLength="1"} } )
        )
      ),
      empty
    }+
  }

sorting = 
  element sorting {
    # presort default strings for different entry types
    element presort {
      attribute type { text }?,
      text
    }+,
    # excludes of certain fields for sorting for specified types
    element sortexclusion {
      attribute type { text },
      element exclusion { text }+
    }*,
    sort+
  }

sort =
  # sort specification
  element sort {
    # order of this specification in the set of all sort specifications
    attribute order { xsd:integer },
    # Should we stop generating sorting information after this item?
    attribute final { "1" }?,
    # Sort ascending or descending
    attribute sort_direction { "ascending" | "descending" }?,
    # Sort case sensitive or not?
    attribute sortcase { "0" | "1" }?,
    # Sort upper before lower?
    attribute sortupper { "0" | "1" }?,
    # A sort item specification - a field or pseudo-field to get sort information from
    element sortitem {
      # order of this item in the set of all other item specifications
      attribute order { xsd:integer },
      # Just use a part of the item information for sorting?
      attribute substring_side { "left" | "right" }?,
      attribute substring_width { xsd:integer }?,
      # Pad the item information when sorting with it?
      attribute pad_side { "left" | "right" }?,
      attribute pad_width { xsd:integer }?,
      attribute pad_char { xsd:string { minLength = "1" maxLength = "1" } }?,
      attribute form { "original" | "translated" | "romanised" | "uniform" }?,
      text
    }+
  }+