<!-- Entities. -->
<!ENTITY % boolean "(true|false)">
<!ENTITY % type_modifier "(n|o|N)">

<!-- Root element. -->
<!ELEMENT signatures (depends_on|struct|cftype|opaque|constant|string_constant|enum|function|function_alias|informal_protocol|class)*>
<!ATTLIST signatures version CDATA "1.0">

<!-- Dependencies. -->
<!ELEMENT depends_on EMPTY>
<!ATTLIST depends_on path CDATA #REQUIRED>

<!-- Structures. -->
<!ELEMENT struct EMPTY>
<!ATTLIST struct name CDATA #REQUIRED>
<!ATTLIST struct type CDATA #IMPLIED>
<!ATTLIST struct type64 CDATA #IMPLIED>
<!ATTLIST struct opaque %boolean; #IMPLIED>

<!-- Opaques. -->
<!ELEMENT opaque EMPTY>
<!ATTLIST opaque name CDATA #REQUIRED>
<!ATTLIST opaque type CDATA #IMPLIED>
<!ATTLIST opaque type64 CDATA #IMPLIED>

<!-- CFTypes. -->
<!ELEMENT cftype EMPTY>
<!ATTLIST cftype name CDATA #REQUIRED>
<!ATTLIST cftype type CDATA #IMPLIED>
<!ATTLIST cftype type64 CDATA #IMPLIED>
<!ATTLIST cftype gettypeid_func CDATA #IMPLIED>
<!ATTLIST cftype tollfree CDATA #IMPLIED>

<!-- Constants. -->
<!ELEMENT constant EMPTY>
<!ATTLIST constant name CDATA #REQUIRED>
<!ATTLIST constant type CDATA #IMPLIED>
<!ATTLIST constant type64 CDATA #IMPLIED>
<!ATTLIST constant magic_cookie %boolean; #IMPLIED>

<!-- String constants. -->
<!ELEMENT string_constant EMPTY>
<!ATTLIST string_constant name CDATA #REQUIRED>
<!ATTLIST string_constant value CDATA #IMPLIED>
<!ATTLIST string_constant value64 CDATA #IMPLIED>
<!ATTLIST string_constant nsstring %boolean; #IMPLIED>

<!-- Enums. -->
<!ELEMENT enum EMPTY>
<!ATTLIST enum name CDATA #REQUIRED>
<!ATTLIST enum value CDATA #IMPLIED>
<!ATTLIST enum value64 CDATA #IMPLIED>
<!ATTLIST enum le_value CDATA #IMPLIED>
<!ATTLIST enum be_value CDATA #IMPLIED>
<!ATTLIST enum ignore %boolean; #IMPLIED>
<!ATTLIST enum suggestion CDATA #IMPLIED>

<!-- Arguments. -->
<!ELEMENT arg (arg*,retval?)>
<!ATTLIST arg index CDATA #IMPLIED>
<!ATTLIST arg type_modifier %type_modifier; #IMPLIED>
<!ATTLIST arg c_array_length_in_arg CDATA #IMPLIED>
<!ATTLIST arg c_array_length_in_retval CDATA #IMPLIED>
<!ATTLIST arg c_array_of_fixed_length CDATA #IMPLIED>
<!ATTLIST arg c_array_delimited_by_null %boolean; #IMPLIED>
<!ATTLIST arg c_array_of_variable_length %boolean; #IMPLIED>
<!ATTLIST arg null_accepted %boolean; #IMPLIED>
<!ATTLIST arg type CDATA #IMPLIED>
<!ATTLIST arg type64 CDATA #IMPLIED>
<!ATTLIST arg function_pointer %boolean; #IMPLIED>
<!ATTLIST arg printf_format %boolean; #IMPLIED>
<!ATTLIST arg sel_of_type CDATA #IMPLIED>
<!ATTLIST arg sel_of_type64 CDATA #IMPLIED>

<!-- Return values. -->
<!ELEMENT retval (arg*, retval?)>
<!ATTLIST retval c_array_length_in_arg CDATA #IMPLIED>
<!ATTLIST retval c_array_of_fixed_length CDATA #IMPLIED>
<!ATTLIST retval c_array_delimited_by_null %boolean; #IMPLIED>
<!ATTLIST retval c_array_of_variable_length %boolean; #IMPLIED>
<!ATTLIST retval already_retained CDATA #IMPLIED>
<!ATTLIST retval type CDATA #IMPLIED>
<!ATTLIST retval type64 CDATA #IMPLIED>
<!ATTLIST retval function_pointer %boolean; #IMPLIED>

<!-- Functions. -->
<!ELEMENT function (arg*,retval?)>
<!ATTLIST function name CDATA #REQUIRED>
<!ATTLIST function variadic %boolean; #IMPLIED>
<!ATTLIST function inline %boolean; #IMPLIED>
<!ATTLIST function sentinel CDATA #IMPLIED>

<!-- Function aliases. -->
<!ELEMENT function_alias EMPTY>
<!ATTLIST function_alias name CDATA #REQUIRED>
<!ATTLIST function_alias original CDATA #REQUIRED>

<!-- Informal protocols. -->
<!ELEMENT informal_protocol (method*)>
<!ATTLIST informal_protocol name CDATA #REQUIRED>

<!-- Classes. -->
<!ELEMENT class (method*)>
<!ATTLIST class name CDATA #REQUIRED>

<!-- Methods. -->
<!ELEMENT method (arg*,retval?)>
<!ATTLIST method selector CDATA #REQUIRED>
<!ATTLIST method type CDATA #IMPLIED>
<!ATTLIST method type64 CDATA #IMPLIED>
<!ATTLIST method class_method %boolean; #IMPLIED>
<!ATTLIST method ignore %boolean; #IMPLIED>
<!ATTLIST method suggestion CDATA #IMPLIED>
<!ATTLIST method variadic %boolean; #IMPLIED>
<!ATTLIST method sentinel CDATA #IMPLIED>