# Metadata for a category

namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

catmetadata =
  element catmetadata { attlist.catmetadata, longdescription* }
attlist.catmetadata &=
  [ a:defaultValue = "" ] attribute pkgname { text }?
# Metadata for a package
pkgmetadata =
  element pkgmetadata {
    attlist.pkgmetadata,
    (maintainer
     | longdescription
     | slots
     | stabilize-allarches
     | use
     | upstream)*
  }
attlist.pkgmetadata &=
  [ a:defaultValue = "" ] attribute pkgname { text }?
#  One tag for each maintainer of a package, multiple allowed
maintainer =
  element maintainer {
    attlist.maintainer, (email | name | description)+
  }
# type attribute determines whether the maintainer is a person or a project.
# Unknown is added to handle <maintainer/>s in <upstream/>s. Using it (or no
# explicit type) for Gentoo maintainers is prohibited.
attlist.maintainer &=
  [ a:defaultValue = "unknown" ]
  attribute type { "person" | "project" | "unknown" }?
# proxied attribute determines whether the maintainer is a proxied
# maintainer (yes), regular dev (no) or a proxy for somebody (proxy). It is
# valid only for Gentoo maintainers.
attlist.maintainer &=
  [ a:defaultValue = "no" ]
  attribute proxied { "yes" | "no" | "proxy" }?
#  A long description of the package in freetext
longdescription =
  element longdescription {
    attlist.longdescription, (text | pkg | cat)*
  }
# A description of the packages SLOTs
slots = element slots { attlist.slots, slot*, subslots? }
# A particular SLOT
slot = element slot { attlist.slot, text* }
# name attribute holds the name of the SLOT, for sub-SLOTS
# use the subslots element. A slot name of '*' can be used to
# indicate a single description applying to all the slots in which
# case no other <slot/> elements may be present.
attlist.slot &= attribute name { text }
# The meaning of sub-SLOTs for the whole package
subslots = element subslots { attlist.subslots, text* }
attlist.subslots &= empty
# whether it's possible to stabilize ALLARCHES
stabilize-allarches =
  element stabilize-allarches { attlist.stabilize-allarches, empty }
# description of what this USE flag does for this package
use = element use { attlist.use, flag* }
flag = element flag { attlist.flag, (text | pkg | cat)* }
# name attribute holds the name of the USE flag
attlist.flag &= attribute name { text }
# upstream metadata information (maintainers, upstream docs,..)
upstream =
  element upstream {
    attlist.upstream,
    (maintainer | changelog | doc | bugs-to | remote-id)*
  }
attlist.upstream &= empty
# Due to the limitation of DTD this will also allow a status
# attribute for the package maintainer element. Please note that
# the usage of the status attribute is nevertheless _only_ allowed
# in the upstream maintainer element.
attlist.maintainer &=
  [ a:defaultValue = "unknown" ]
  attribute status { "active" | "inactive" | "unknown" }?
# URL where the upstream changelog can be found
changelog = element changelog { attlist.changelog, text }
attlist.changelog &= empty
# URL where the location of the upstream documentation can be found
doc = element doc { attlist.doc, text }
attlist.doc &= [ a:defaultValue = "en" ] attribute lang { text }?
# location where to report bugs
# (may also be an email address prefixed with mailto:)
bugs-to = element bugs-to { attlist.bugs-to, text }
attlist.bugs-to &= empty
# specify a type of package identification tracker
remote-id = element remote-id { attlist.remote-id, text }
attlist.remote-id &=
  attribute type {
    "bitbucket"
    | "cpan"
    | "cpan-module"
    | "cpe"
    | "cran"
    | "ctan"
    | "gentoo"
    | "github"
    | "gitlab"
    | "google-code"
    | "hackage"
    | "heptapod"
    | "launchpad"
    | "osdn"
    | "pear"
    | "pecl"
    | "pypi"
    | "rubygems"
    | "sourceforge"
    | "sourcehut"
    | "vim"
  }
# category/package information for cross-linking in descriptions
# and useflag descriptions
pkg = element pkg { attlist.pkg, text }
attlist.pkg &= empty
cat = element cat { attlist.cat, text }
attlist.cat &= empty
# Common attributes

# the lang attribute, specifies the language of this tag in the
# form of an IETF (BCP 47) language tag. This is only useful for
# descriptions of various kinds. If a tag with this attribute is
# included there must be a description in the default language "en"
attlist.description &=
  [ a:defaultValue = "en" ] attribute lang { text }?
attlist.longdescription &=
  [ a:defaultValue = "en" ] attribute lang { text }?
attlist.slots &= [ a:defaultValue = "en" ] attribute lang { text }?
attlist.use &= [ a:defaultValue = "en" ] attribute lang { text }?
# The restrict attribute, this attribute specifies restrictions on
# the applicability of tags on versions. The format of this attribute is
# equal to the format of DEPEND lines in ebuilds. Only package
# dependency specifications conforming to EAPI=0 syntax are allowed.
# The dependency specification may only contain references to the
# package itself and no other package.
# 
# For required tags, there must be either an unrestricted version, or a
# version that is default restricted.
attlist.maintainer &= attribute restrict { text }?
attlist.longdescription &= attribute restrict { text }?
attlist.flag &= attribute restrict { text }?
attlist.stabilize-allarches &= attribute restrict { text }?
# standard parts

# an email address
email = element email { attlist.email, text }
attlist.email &= empty
# the name of a person (maintainer, contributor)
name = element name { attlist.name, text }
attlist.name &= empty
# A description of a maintainer or change
description = element description { attlist.description, text }
start = pkgmetadata | catmetadata