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->4.3. The DTD classes</A
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->Sorry, not yet
-written. Perhaps the interface definition of Pxp_dtd expresses the same:</I
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-><PRE
-CLASS="PROGRAMLISTING"
-> (**********************************************************************)
-(* *)
-(* Pxp_dtd: *)
-(* Object model of document type declarations *)
-(* *)
-(**********************************************************************)
-
-(* ======================================================================
- * OVERVIEW
- *
- * class dtd ............... represents the whole DTD, including element
- * declarations, entity declarations, notation
- * declarations, and processing instructions
- * class dtd_element ....... represents an element declaration consisting
- * of a content model and an attribute list
- * declaration
- * class dtd_notation ...... represents a notation declaration
- * class proc_instruction .. represents a processing instruction
- * ======================================================================
- *
- *)
-
-
-class dtd :
- (* Creation:
- * new dtd
- * creates a new, empty DTD object without any declaration, without a root
- * element, without an ID.
- *)
- Pxp_types.collect_warnings ->
- Pxp_types.rep_encoding ->
- object
- method root : string option
- (* get the name of the root element if present *)
-
- method set_root : string -> unit
- (* set the name of the root element. This method can be invoked
- * only once
- *)
-
- method id : Pxp_types.dtd_id option
- (* get the identifier for this DTD *)
-
- method set_id : Pxp_types.dtd_id -> unit
- (* set the identifier. This method can be invoked only once *)
-
- method encoding : Pxp_types.rep_encoding
- (* returns the encoding used for character representation *)
-
-
- method allow_arbitrary : unit
- (* After this method has been invoked, the object changes its behaviour:
- * - elements and notations that have not been added may be used in an
- * arbitrary way; the methods "element" and "notation" indicate this
- * by raising Undeclared instead of Validation_error.
- *)
-
- method disallow_arbitrary : unit
-
- method arbitrary_allowed : bool
- (* Returns whether arbitrary contents are allowed or not. *)
-
- method standalone_declaration : bool
- (* Whether there is a 'standalone' declaration or not. Strictly
- * speaking, this declaration is not part of the DTD, but it is
- * included here because of practical reasons.
- * If not set, this property defaults to 'false'.
- *)
-
- method set_standalone_declaration : bool -> unit
- (* Sets the 'standalone' declaration. *)
-
-
- method add_element : dtd_element -> unit
- (* add the given element declaration to this DTD. Raises Not_found
- * if there is already an element declaration with the same name.
- *)
-
- method add_gen_entity : Pxp_entity.entity -> bool -> unit
- (* add_gen_entity e extdecl:
- * add the entity 'e' as general entity to this DTD (general entities
- * are those represented by &name;). If there is already a declaration
- * with the same name, the second definition is ignored; as exception from
- * this rule, entities with names "lt", "gt", "amp", "quot", and "apos"
- * may only be redeclared with a definition that is equivalent to the
- * standard definition; otherwise a Validation_error is raised.
- *
- * 'extdecl': 'true' indicates that the entity declaration occurs in
- * an external entity. (Used for the standalone check.)
- *)
-
- method add_par_entity : Pxp_entity.entity -> unit
- (* add the given entity as parameter entity to this DTD (parameter
- * entities are those represented by %name;). If there is already a
- * declaration with the same name, the second definition is ignored.
- *)
-
- method add_notation : dtd_notation -> unit
- (* add the given notation to this DTD. If there is already a declaration
- * with the same name, a Validation_error is raised.
- *)
-
- method add_pinstr : proc_instruction -> unit
- (* add the given processing instruction to this DTD. *)
-
- method element : string -> dtd_element
- (* looks up the element declaration with the given name. Raises
- * Validation_error if the element cannot be found. (If "allow_arbitrary"
- * has been invoked before, Unrestricted is raised instead.)
- *)
-
- method element_names : string list
- (* returns the list of the names of all element declarations. *)
-
- method gen_entity : string -> (Pxp_entity.entity * bool)
- (* let e, extdecl = obj # gen_entity n:
- * looks up the general entity 'e' with the name 'n'. Raises
- * WF_error if the entity cannot be found.
- * 'extdecl': indicates whether the entity declaration occured in an
- * external entity.
- *)
-
- method gen_entity_names : string list
- (* returns the list of all general entity names *)
-
- method par_entity : string -> Pxp_entity.entity
- (* looks up the parameter entity with the given name. Raises
- * WF_error if the entity cannot be found.
- *)
-
- method par_entity_names : string list
- (* returns the list of all parameter entity names *)
-
- method notation : string -> dtd_notation
- (* looks up the notation declaration with the given name. Raises
- * Validation_error if the notation cannot be found. (If "allow_arbitrary"
- * has been invoked before, Unrestricted is raised instead.)
- *)
-
- method notation_names : string list
- (* Returns the list of the names of all added notations *)
-
- method pinstr : string -> proc_instruction list
- (* looks up all processing instructions with the given target.
- * The "target" is the identifier following "<?".
- * Note: It is not possible to find out the exact position of the
- * processing instruction.
- *)
-
- method pinstr_names : string list
- (* Returns the list of the names (targets) of all added pinstrs *)
-
- method validate : unit
- (* ensures that the DTD is valid. This method is optimized such that
- * actual validation is only performed if DTD has changed.
- * If the DTD is invalid, mostly a Validation_error is raised,
- * but other exceptions are possible, too.
- *)
-
- method only_deterministic_models : unit
- (* Succeeds if all regexp content models are deterministic.
- * Otherwise Validation_error.
- *)
-
- method write : Pxp_types.output_stream -> Pxp_types.encoding -> bool -> unit
- (* write_compact_as_latin1 os enc doctype:
- * Writes the DTD as 'enc'-encoded string to 'os'. If 'doctype', a
- * DTD like <!DOCTYPE root [ ... ]> is written. If 'not doctype',
- * only the declarations are written (the material within the
- * square brackets).
- *)
-
- method write_compact_as_latin1 : Pxp_types.output_stream -> bool -> unit
- (* DEPRECATED METHOD; included only to keep compatibility with
- * older versions of the parser
- *)
-
-
- (*----------------------------------------*)
- method invalidate : unit
- (* INTERNAL METHOD *)
- method warner : Pxp_types.collect_warnings
- (* INTERNAL METHOD *)
- end
-
-
-
-(* ---------------------------------------------------------------------- *)
-
-and dtd_element : dtd -> string ->
- (* Creation:
- * new dtd_element init_dtd init_name:
- * creates a new dtd_element object for init_dtd with init_name.
- * The strings are represented in the same encoding as init_dtd.
- *)
- object
-
- method name : string
- (* returns the name of the declared element *)
-
- method externally_declared : bool
- (* returns whether the element declaration occurs in an external
- * entity.
- *)
-
- method content_model : Pxp_types.content_model_type
- (* get the content model of this element declaration, or Unspecified *)
-
- method content_dfa : Pxp_dfa.dfa_definition option
- (* return the DFA of the content model if there is a DFA, or None.
- * A DFA exists only for regexp style content models which are
- * deterministic.
- *)
-
- method set_cm_and_extdecl : Pxp_types.content_model_type -> bool -> unit
- (* set_cm_and_extdecl cm extdecl:
- * set the content model to 'cm'. Once the content model is not
- * Unspecified, it cannot be set to a different value again.
- * Furthermore, it is set whether the element occurs in an external
- * entity ('extdecl').
- *)
-
- method encoding : Pxp_types.rep_encoding
- (* Return the encoding of the strings *)
-
- method allow_arbitrary : unit
- (* After this method has been invoked, the object changes its behaviour:
- * - attributes that have not been added may be used in an
- * arbitrary way; the method "attribute" indicates this
- * by raising Undeclared instead of Validation_error.
- *)
-
- method disallow_arbitrary : unit
-
- method arbitrary_allowed : bool
- (* Returns whether arbitrary attributes are allowed or not. *)
-
- method attribute : string ->
- Pxp_types.att_type * Pxp_types.att_default
- (* get the type and default value of a declared attribute, or raise
- * Validation_error if the attribute does not exist.
- * If 'arbitrary_allowed', the exception Undeclared is raised instead
- * of Validation_error.
- *)
-
- method attribute_violates_standalone_declaration :
- string -> string option -> bool
- (* attribute_violates_standalone_declaration name v:
- * Checks whether the attribute 'name' violates the "standalone"
- * declaration if it has value 'v'.
- * The method returns true if:
- * - The attribute declaration occurs in an external entity,
- * and if one of the two conditions holds:
- * - v = None, and there is a default for the attribute value
- * - v = Some s, and the type of the attribute is not CDATA,
- * and s changes if normalized according to the rules of the
- * attribute type.
- *
- * The method raises Validation_error if the attribute does not exist.
- * If 'arbitrary_allowed', the exception Undeclared is raised instead
- * of Validation_error.
- *)
-
- method attribute_names : string list
- (* get the list of all declared attributes *)
-
- method names_of_required_attributes : string list
- (* get the list of all attributes that are specified as required
- * attributes
- *)
-
- method id_attribute_name : string option
- (* Returns the name of the attribute with type ID, or None. *)
-
- method idref_attribute_names : string list
- (* Returns the names of the attributes with type IDREF or IDREFS. *)
-
- method add_attribute : string ->
- Pxp_types.att_type ->
- Pxp_types.att_default ->
- bool ->
- unit
- (* add_attribute name type default extdecl:
- * add an attribute declaration for an attribute with the given name,
- * type, and default value. If there is more than one declaration for
- * an attribute name, the first declaration counts; the other declarations
- * are ignored.
- * 'extdecl': if true, the attribute declaration occurs in an external
- * entity. This property is used to check the "standalone" attribute.
- *)
-
- method validate : unit
- (* checks whether this element declaration (i.e. the content model and
- * all attribute declarations) is valid for the associated DTD.
- * Raises mostly Validation_error if the validation fails.
- *)
-
- method write : Pxp_types.output_stream -> Pxp_types.encoding -> unit
- (* write_compact_as_latin1 os enc:
- * Writes the <!ELEMENT ... > declaration to 'os' as 'enc'-encoded string.
- *)
-
- method write_compact_as_latin1 : Pxp_types.output_stream -> unit
- (* DEPRECATED METHOD; included only to keep compatibility with
- * older versions of the parser
- *)
- end
-
-(* ---------------------------------------------------------------------- *)
-
-and dtd_notation : string -> Pxp_types.ext_id -> Pxp_types.rep_encoding ->
- (* Creation:
- * new dtd_notation a_name an_external_ID init_encoding
- * creates a new dtd_notation object with the given name and the given
- * external ID.
- *)
- object
- method name : string
- method ext_id : Pxp_types.ext_id
- method encoding : Pxp_types.rep_encoding
-
- method write : Pxp_types.output_stream -> Pxp_types.encoding -> unit
- (* write_compact_as_latin1 os enc:
- * Writes the <!NOTATION ... > declaration to 'os' as 'enc'-encoded
- * string.
- *)
-
- method write_compact_as_latin1 : Pxp_types.output_stream -> unit
- (* DEPRECATED METHOD; included only to keep compatibility with
- * older versions of the parser
- *)
-
- end
-
-(* ---------------------------------------------------------------------- *)
-
-and proc_instruction : string -> string -> Pxp_types.rep_encoding ->
- (* Creation:
- * new proc_instruction a_target a_value
- * creates a new proc_instruction object with the given target string and
- * the given value string.
- * Note: A processing instruction is written as <?target value?>.
- *)
- object
- method target : string
- method value : string
- method encoding : Pxp_types.rep_encoding
-
- method write : Pxp_types.output_stream -> Pxp_types.encoding -> unit
- (* write os enc:
- * Writes the <?...?> PI to 'os' as 'enc'-encoded string.
- *)
-
- method write_compact_as_latin1 : Pxp_types.output_stream -> unit
- (* DEPRECATED METHOD; included only to keep compatibility with
- * older versions of the parser
- *)
-
- method parse_pxp_option : (string * string * (string * string) list)
- (* Parses a PI containing a PXP option. Such PIs are formed like:
- * <?target option-name option-att="value" option-att="value" ... ?>
- * The method returns a triple
- * (target, option-name, [option-att, value; ...])
- * or raises Error.
- *)
-
- end
-
-;; </PRE
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