# This schema cannot be used on its own. It is designed to be combined
# with the core Mallard schema using the version attribute.
namespace if = "http://projectmallard.org/if/1.0/"

if_attr_test = attribute test { text }
if_attr_if_test = attribute if:test { text }
mal_block_attr &= if_attr_if_test ?
mal_block_list_item_attr &= if_attr_if_test ?
mal_block_steps_item_attr &= if_attr_if_test ?
mal_block_terms_item_attr &= if_attr_if_test ?
mal_block_tree_item_attr &= if_attr_if_test ?

if_if = element if:if {
  if_if_attr,
  mal_block *
}
if_if_attr = (
  if_attr_test,
  attribute style { xsd:NMTOKENS } ?,
  mal_attr_external *
)
mal_block_elements |= if_if

if_choose = element if:choose {
  if_choose_attr,
  if_when +,
  ( if_else |
    mal_block * ) ?
}
if_choose_attr = (
  attribute style { xsd:NMTOKENS } ?,
  mal_attr_external *
)
mal_block_elements |= if_choose

if_when = element if:when {
  if_when_attr,
  mal_block *
}
if_when_attr = (
  if_attr_test,
  attribute style { xsd:NMTOKENS } ?,
  mal_attr_external *
)

if_else = element if:else {
  if_else_attr,
  mal_block *
}
if_else_attr = (
  attribute style { xsd:NMTOKENS } ?,
  mal_attr_external *
)