lisp/nxml/rng-nxml.el

   1 ;;; rng-nxml.el --- make nxml-mode take advantage of rng-validate-mode
   2
   3 ;; Copyright (C) 2003, 2007-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: James Clark
   6 ;; Keywords: XML, RelaxNG
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (require 'easymenu)
  28 (require 'xmltok)
  29 (require 'nxml-util)
  30 (require 'nxml-ns)
  31 (require 'rng-match)
  32 (require 'rng-util)
  33 (require 'rng-valid)
  34 (require 'nxml-mode)
  35 (require 'rng-loc)
  36
  37 (defcustom rng-nxml-auto-validate-flag t
  38   "Non-nil means automatically turn on validation with nxml-mode."
  39   :type 'boolean
  40   :group 'relax-ng)
  41
  42 (defcustom rng-preferred-prefix-alist
  43   '(("http://www.w3.org/1999/XSL/Transform" . "xsl")
  44     ("http://www.w3.org/1999/02/22-rdf-syntax-ns#" . "rdf")
  45     ("http://www.w3.org/1999/xlink" . "xlink")
  46     ("http://www.w3.org/2001/XmlSchema" . "xsd")
  47     ("http://www.w3.org/2001/XMLSchema-instance" . "xsi")
  48     ("http://purl.org/dc/elements/1.1/" . "dc")
  49     ("http://purl.org/dc/terms/" . "dcterms"))
  50   "Alist of namespaces vs preferred prefixes."
  51   :type '(repeat (cons :tag "With"
  52                        (string :tag "this namespace URI")
  53                        (string :tag "use this prefix")))
  54   :group 'relax-ng)
  55
  56 (defvar rng-complete-end-tags-after-< t
  57   "*Non-nil means immediately after < complete on end-tag names.
  58 Complete on start-tag names regardless.")
  59
  60 (defvar rng-nxml-easy-menu
  61   '("XML"
  62     ["Show Outline Only" nxml-hide-all-text-content]
  63     ["Show Everything" nxml-show-all]
  64     "---"
  65     ["Validation" rng-validate-mode
  66      :style toggle
  67      :selected rng-validate-mode]
  68     "---"
  69     ("Set Schema"
  70      ["Automatically" rng-auto-set-schema]
  71      ("For Document Type"
  72       :filter (lambda (menu)
  73                 (mapcar (lambda (type-id)
  74                           (vector type-id
  75                                   (list 'rng-set-document-type
  76                                         type-id)))
  77                         (rng-possible-type-ids))))
  78      ["Any Well-Formed XML" rng-set-vacuous-schema]
  79      ["File..." rng-set-schema-file])
  80     ["Show Schema Location" rng-what-schema]
  81     ["Save Schema Location" rng-save-schema-location :help
  82      "Save the location of the schema currently being used for this buffer"]
  83     "---"
  84     ["First Error" rng-first-error :active rng-validate-mode]
  85     ["Next Error" rng-next-error :active rng-validate-mode]
  86     "---"
  87     ["Customize nXML" (customize-group 'nxml)]))
  88
  89 ;;;###autoload
  90 (defun rng-nxml-mode-init ()
  91   "Initialize `nxml-mode' to take advantage of `rng-validate-mode'.
  92 This is typically called from `nxml-mode-hook'.
  93 Validation will be enabled if `rng-nxml-auto-validate-flag' is non-nil."
  94   (interactive)
  95   (define-key nxml-mode-map "\C-c\C-v" 'rng-validate-mode)
  96   (define-key nxml-mode-map "\C-c\C-s\C-w" 'rng-what-schema)
  97   (define-key nxml-mode-map "\C-c\C-s\C-a" 'rng-auto-set-schema-and-validate)
  98   (define-key nxml-mode-map "\C-c\C-s\C-f" 'rng-set-schema-file-and-validate)
  99   (define-key nxml-mode-map "\C-c\C-s\C-l" 'rng-save-schema-location)
 100   (define-key nxml-mode-map "\C-c\C-s\C-t" 'rng-set-document-type-and-validate)
 101   (define-key nxml-mode-map "\C-c\C-n" 'rng-next-error)
 102   (easy-menu-define rng-nxml-menu nxml-mode-map
 103     "Menu for nxml-mode used with rng-validate-mode."
 104     rng-nxml-easy-menu)
 105   (add-to-list 'mode-line-process
 106                '(rng-validate-mode (:eval (rng-compute-mode-line-string)))
 107                'append)
 108   (cond (rng-nxml-auto-validate-flag
 109          (rng-validate-mode 1)
 110          (add-hook 'nxml-completion-hook 'rng-complete nil t)
 111          (add-hook 'nxml-in-mixed-content-hook 'rng-in-mixed-content-p nil t))
 112         (t
 113          (rng-validate-mode 0)
 114          (remove-hook 'nxml-completion-hook 'rng-complete t)
 115          (remove-hook 'nxml-in-mixed-content-hook 'rng-in-mixed-content-p t))))
 116
 117 (defvar rng-tag-history nil)
 118 (defvar rng-attribute-name-history nil)
 119 (defvar rng-attribute-value-history nil)
 120
 121 (defvar rng-complete-target-names nil)
 122 (defvar rng-complete-name-attribute-flag nil)
 123 (defvar rng-complete-extra-strings nil)
 124
 125 (defun rng-complete ()
 126   "Complete the string before point using the current schema.
 127 Return non-nil if in a context it understands."
 128   (interactive)
 129   (and rng-validate-mode
 130        (let ((lt-pos (save-excursion (search-backward "<" nil t)))
 131              xmltok-dtd)
 132          (and lt-pos
 133               (= (rng-set-state-after lt-pos) lt-pos)
 134               (or (rng-complete-tag lt-pos)
 135                   (rng-complete-end-tag lt-pos)
 136                   (rng-complete-attribute-name lt-pos)
 137                   (rng-complete-attribute-value lt-pos))))))
 138
 139 (defconst rng-in-start-tag-name-regex
 140   (replace-regexp-in-string
 141    "w"
 142    xmltok-ncname-regexp
 143    "<\\(?:w\\(?::w?\\)?\\)?\\="
 144    t
 145    t))
 146
 147 (defun rng-complete-tag (lt-pos)
 148   (let (rng-complete-extra-strings)
 149     (when (and (= lt-pos (1- (point)))
 150                rng-complete-end-tags-after-<
 151                rng-open-elements
 152                (not (eq (car rng-open-elements) t))
 153                (or rng-collecting-text
 154                    (rng-match-save
 155                      (rng-match-end-tag))))
 156       (setq rng-complete-extra-strings
 157             (cons (concat "/"
 158                           (if (caar rng-open-elements)
 159                               (concat (caar rng-open-elements)
 160                                       ":"
 161                                       (cdar rng-open-elements))
 162                             (cdar rng-open-elements)))
 163                   rng-complete-extra-strings)))
 164     (when (save-excursion
 165             (re-search-backward rng-in-start-tag-name-regex
 166                                 lt-pos
 167                                 t))
 168       (and rng-collecting-text (rng-flush-text))
 169       (let ((completion
 170              (let ((rng-complete-target-names
 171                     (rng-match-possible-start-tag-names))
 172                    (rng-complete-name-attribute-flag nil))
 173                (rng-complete-before-point (1+ lt-pos)
 174                                           'rng-complete-qname-function
 175                                           "Tag: "
 176                                           nil
 177                                           'rng-tag-history)))
 178             name)
 179         (when completion
 180           (cond ((rng-qname-p completion)
 181                  (setq name (rng-expand-qname completion
 182                                               t
 183                                               'rng-start-tag-expand-recover))
 184                  (when (and name
 185                             (rng-match-start-tag-open name)
 186                             (or (not (rng-match-start-tag-close))
 187                                 ;; need a namespace decl on the root element
 188                                 (and (car name)
 189                                      (not rng-open-elements))))
 190                    ;; attributes are required
 191                    (insert " ")))
 192                 ((member completion rng-complete-extra-strings)
 193                  (insert ">")))))
 194       t)))
 195
 196 (defconst rng-in-end-tag-name-regex
 197   (replace-regexp-in-string
 198    "w"
 199    xmltok-ncname-regexp
 200    "</\\(?:w\\(?::w?\\)?\\)?\\="
 201    t
 202    t))
 203
 204 (defun rng-complete-end-tag (lt-pos)
 205   (when (save-excursion
 206           (re-search-backward rng-in-end-tag-name-regex
 207                               lt-pos
 208                               t))
 209     (cond ((or (not rng-open-elements)
 210                (eq (car rng-open-elements) t))
 211            (message "No matching start-tag")
 212            (ding))
 213           (t
 214            (let ((start-tag-name
 215                   (if (caar rng-open-elements)
 216                       (concat (caar rng-open-elements)
 217                               ":"
 218                               (cdar rng-open-elements))
 219                     (cdar rng-open-elements)))
 220                  (end-tag-name
 221                   (buffer-substring-no-properties (+ (match-beginning 0) 2)
 222                                                   (point))))
 223              (cond ((or (> (length end-tag-name)
 224                            (length start-tag-name))
 225                         (not (string= (substring start-tag-name
 226                                                  0
 227                                                  (length end-tag-name))
 228                                       end-tag-name)))
 229                     (message "Expected end-tag %s"
 230                              (rng-quote-string
 231                               (concat "</" start-tag-name ">")))
 232                     (ding))
 233                    (t
 234                     (delete-region (- (point) (length end-tag-name))
 235                                    (point))
 236                     (insert start-tag-name ">")
 237                     (when (not (or rng-collecting-text
 238                                    (rng-match-end-tag)))
 239                       (message "Element %s is incomplete"
 240                                (rng-quote-string start-tag-name))))))))
 241     t))
 242
 243 (defconst rng-in-attribute-regex
 244   (replace-regexp-in-string
 245    "w"
 246    xmltok-ncname-regexp
 247    "<w\\(?::w\\)?\
 248 \\(?:[ \t\r\n]+w\\(?::w\\)?[ \t\r\n]*=\
 249 [ \t\r\n]*\\(?:\"[^\"]*\"\\|'[^']*'\\)\\)*\
 250 [ \t\r\n]+\\(\\(?:w\\(?::w?\\)?\\)?\\)\\="
 251    t
 252    t))
 253
 254 (defvar rng-undeclared-prefixes nil)
 255
 256 (defun rng-complete-attribute-name (lt-pos)
 257   (when (save-excursion
 258           (re-search-backward rng-in-attribute-regex lt-pos t))
 259     (let ((attribute-start (match-beginning 1))
 260           rng-undeclared-prefixes)
 261       (and (rng-adjust-state-for-attribute lt-pos
 262                                            attribute-start)
 263            (let ((rng-complete-target-names
 264                   (rng-match-possible-attribute-names))
 265                  (rng-complete-extra-strings
 266                   (mapcar (lambda (prefix)
 267                             (if prefix
 268                                 (concat "xmlns:" prefix)
 269                               "xmlns"))
 270                           rng-undeclared-prefixes))
 271                  (rng-complete-name-attribute-flag t))
 272              (rng-complete-before-point attribute-start
 273                                         'rng-complete-qname-function
 274                                         "Attribute: "
 275                                         nil
 276                                         'rng-attribute-name-history))
 277            (insert "=\"")))
 278     t))
 279
 280 (defconst rng-in-attribute-value-regex
 281   (replace-regexp-in-string
 282    "w"
 283    xmltok-ncname-regexp
 284    "<w\\(?::w\\)?\
 285 \\(?:[ \t\r\n]+w\\(?::w\\)?[ \t\r\n]*=\
 286 [ \t\r\n]*\\(?:\"[^\"]*\"\\|'[^']*'\\)\\)*\
 287 [ \t\r\n]+\\(w\\(:w\\)?\\)[ \t\r\n]*=[ \t\r\n]*\
 288 \\(\"[^\"]*\\|'[^']*\\)\\="
 289    t
 290    t))
 291
 292 (defun rng-complete-attribute-value (lt-pos)
 293   (when (save-excursion
 294           (re-search-backward rng-in-attribute-value-regex lt-pos t))
 295     (let ((name-start (match-beginning 1))
 296           (name-end (match-end 1))
 297           (colon (match-beginning 2))
 298           (value-start (1+ (match-beginning 3))))
 299       (and (rng-adjust-state-for-attribute lt-pos
 300                                            name-start)
 301            (if (string= (buffer-substring-no-properties name-start
 302                                                         (or colon name-end))
 303                         "xmlns")
 304                (rng-complete-before-point
 305                 value-start
 306                 (rng-strings-to-completion-alist
 307                  (rng-possible-namespace-uris
 308                   (and colon
 309                        (buffer-substring-no-properties (1+ colon) name-end))))
 310                 "Namespace URI: "
 311                 nil
 312                 'rng-namespace-uri-history)
 313              (rng-adjust-state-for-attribute-value name-start
 314                                                    colon
 315                                                    name-end)
 316              (rng-complete-before-point
 317               value-start
 318               (rng-strings-to-completion-alist
 319                (rng-match-possible-value-strings))
 320               "Value: "
 321               nil
 322               'rng-attribute-value-history))
 323            (insert (char-before value-start))))
 324     t))
 325
 326 (defun rng-possible-namespace-uris (prefix)
 327   (let ((ns (if prefix (nxml-ns-get-prefix prefix)
 328               (nxml-ns-get-default))))
 329     (if (and ns (memq prefix (nxml-ns-changed-prefixes)))
 330         (list (nxml-namespace-name ns))
 331       (mapcar 'nxml-namespace-name
 332               (delq nxml-xml-namespace-uri
 333                     (rng-match-possible-namespace-uris))))))
 334
 335 (defconst rng-qname-regexp
 336   (concat "\\`"
 337           xmltok-ncname-regexp
 338           "\\(?:" ":" xmltok-ncname-regexp "\\)" "?" "\\'"))
 339
 340 (defun rng-qname-p (string)
 341   (and (string-match rng-qname-regexp string) t))
 342
 343 (defun rng-expand-qname (qname &optional defaultp recover-fun)
 344   (setq qname (rng-split-qname qname))
 345   (let ((prefix (car qname)))
 346     (if prefix
 347         (let ((ns (nxml-ns-get-prefix qname)))
 348           (cond (ns (cons ns (cdr qname)))
 349                 (recover-fun (funcall recover-fun prefix (cdr qname)))))
 350       (cons (and defaultp (nxml-ns-get-default)) (cdr qname)))))
 351
 352 (defun rng-start-tag-expand-recover (prefix local-name)
 353   (let ((ns (rng-match-infer-start-tag-namespace local-name)))
 354     (and ns
 355          (cons ns local-name))))
 356
 357 (defun rng-split-qname (qname)
 358   (if (string-match ":" qname)
 359       (cons (substring qname 0 (match-beginning 0))
 360             (substring qname (match-end 0)))
 361     (cons nil qname)))
 362
 363 (defun rng-in-mixed-content-p ()
 364   "Return non-nil if point is in mixed content.
 365 Return nil only if point is definitely not in mixed content.
 366 If unsure, return non-nil."
 367   (if (eq rng-current-schema rng-any-element)
 368       t
 369     (rng-set-state-after)
 370     (rng-match-mixed-text)))
 371
 372 (defun rng-set-state-after (&optional pos)
 373   "Set the state for after parsing the first token with endpoint >= POS.
 374 This does not change the xmltok state or point.  However, it does
 375 set `xmltok-dtd'.  Returns the position of the end of the token."
 376   (unless pos (setq pos (point)))
 377   (when (< rng-validate-up-to-date-end pos)
 378     (message "Parsing...")
 379     (while (and (rng-do-some-validation)
 380                 (< rng-validate-up-to-date-end pos))
 381       ;; Display percentage validated.
 382       (force-mode-line-update)
 383       ;; Force redisplay but don't allow idle timers to run.
 384       (let ((timer-idle-list nil))
 385         (sit-for 0)))
 386     (message "Parsing...done"))
 387   (save-excursion
 388     (save-restriction
 389       (widen)
 390       (nxml-with-invisible-motion
 391         (if (= pos 1)
 392             (rng-set-initial-state)
 393           (let ((state (get-text-property (1- pos) 'rng-state)))
 394             (cond (state
 395                    (rng-restore-state state)
 396                    (goto-char pos))
 397                   (t
 398                    (let ((start (previous-single-property-change pos
 399                                                                  'rng-state)))
 400                      (cond (start
 401                             (rng-restore-state (get-text-property (1- start)
 402                                                                   'rng-state))
 403                             (goto-char start))
 404                            (t (rng-set-initial-state))))))))
 405         (xmltok-save
 406           (if (= (point) 1)
 407               (xmltok-forward-prolog)
 408             (setq xmltok-dtd rng-dtd))
 409           (cond ((and (< pos (point))
 410                       ;; This handles the case where the prolog ends
 411                       ;; with a < without any following name-start
 412                       ;; character. This will be treated by the parser
 413                       ;; as part of the prolog, but we want to treat
 414                       ;; it as the start of the instance.
 415                       (eq (char-after pos) ?<)
 416                       (<= (point)
 417                           (save-excursion
 418                             (goto-char (1+ pos))
 419                             (skip-chars-forward " \t\r\n")
 420                             (point))))
 421                  pos)
 422                 ((< (point) pos)
 423                  (let ((rng-dt-namespace-context-getter
 424                         '(nxml-ns-get-context))
 425                        (rng-parsing-for-state t))
 426                    (rng-forward pos))
 427                  (point))
 428                 (t pos)))))))
 429
 430 (defun rng-adjust-state-for-attribute (lt-pos start)
 431   (xmltok-save
 432     (save-excursion
 433       (goto-char lt-pos)
 434       (when (memq (xmltok-forward)
 435                   '(start-tag
 436                     partial-start-tag
 437                     empty-element
 438                     partial-empty-element))
 439         (when (< start (point))
 440           (setq xmltok-namespace-attributes
 441                 (rng-prune-attribute-at start
 442                                         xmltok-namespace-attributes))
 443           (setq xmltok-attributes
 444                 (rng-prune-attribute-at start
 445                                         xmltok-attributes)))
 446         (let ((rng-parsing-for-state t)
 447               (rng-dt-namespace-context-getter '(nxml-ns-get-context)))
 448           (rng-process-start-tag 'stop)
 449           (rng-find-undeclared-prefixes)
 450           t)))))
 451
 452 (defun rng-find-undeclared-prefixes ()
 453   ;; Start with the newly effective namespace declarations.
 454   ;; (Includes declarations added during recovery.)
 455   (setq rng-undeclared-prefixes (nxml-ns-changed-prefixes))
 456   (let ((iter xmltok-attributes)
 457         (ns-state (nxml-ns-state))
 458         att)
 459     ;; Add namespace prefixes used in this tag,
 460     ;; but not declared in the parent.
 461     (nxml-ns-pop-state)
 462     (while iter
 463       (setq att (car iter))
 464       (let ((prefix (xmltok-attribute-prefix att)))
 465         (when (and prefix
 466                    (not (member prefix rng-undeclared-prefixes))
 467                    (not (nxml-ns-get-prefix prefix)))
 468           (setq rng-undeclared-prefixes
 469                 (cons prefix rng-undeclared-prefixes))))
 470       (setq iter (cdr iter)))
 471     (nxml-ns-set-state ns-state)
 472     ;; Remove namespace prefixes explicitly declared.
 473     (setq iter xmltok-namespace-attributes)
 474     (while iter
 475       (setq att (car iter))
 476       (setq rng-undeclared-prefixes
 477             (delete (and (xmltok-attribute-prefix att)
 478                          (xmltok-attribute-local-name att))
 479                   rng-undeclared-prefixes))
 480       (setq iter (cdr iter)))))
 481
 482 (defun rng-prune-attribute-at (start atts)
 483   (when atts
 484     (let ((cur atts))
 485       (while (if (eq (xmltok-attribute-name-start (car cur)) start)
 486                  (progn
 487                    (setq atts (delq (car cur) atts))
 488                    nil)
 489                (setq cur (cdr cur)))))
 490     atts))
 491
 492 (defun rng-adjust-state-for-attribute-value (name-start
 493                                              colon
 494                                              name-end)
 495   (let* ((prefix (if colon
 496                      (buffer-substring-no-properties name-start colon)
 497                    nil))
 498          (local-name (buffer-substring-no-properties (if colon
 499                                                          (1+ colon)
 500                                                        name-start)
 501                                                      name-end))
 502          (ns (and prefix (nxml-ns-get-prefix prefix))))
 503     (and (or (not prefix) ns)
 504          (rng-match-attribute-name (cons ns local-name)))))
 505
 506 (defun rng-complete-qname-function (string predicate flag)
 507   (let ((alist (mapcar (lambda (name) (cons name nil))
 508                        (rng-generate-qname-list string))))
 509     (cond ((not flag)
 510            (try-completion string alist predicate))
 511           ((eq flag t)
 512            (all-completions string alist predicate))
 513           ((eq flag 'lambda)
 514            (and (assoc string alist) t)))))
 515
 516 (defun rng-generate-qname-list (&optional string)
 517   (let ((forced-prefix (and string
 518                             (string-match ":" string)
 519                             (> (match-beginning 0) 0)
 520                             (substring string
 521                                        0
 522                                        (match-beginning 0))))
 523         (namespaces (mapcar 'car rng-complete-target-names))
 524         ns-prefixes-alist ns-prefixes iter ns prefer)
 525     (while namespaces
 526       (setq ns (car namespaces))
 527       (when ns
 528         (setq ns-prefixes-alist
 529               (cons (cons ns (nxml-ns-prefixes-for
 530                               ns
 531                               rng-complete-name-attribute-flag))
 532                     ns-prefixes-alist)))
 533       (setq namespaces (delq ns (cdr namespaces))))
 534     (setq iter ns-prefixes-alist)
 535     (while iter
 536       (setq ns-prefixes (car iter))
 537       (setq ns (car ns-prefixes))
 538       (when (null (cdr ns-prefixes))
 539         ;; No declared prefix for the namespace
 540         (if forced-prefix
 541             ;; If namespace non-nil and prefix undeclared,
 542             ;; use forced prefix.
 543             (when (and ns
 544                        (not (nxml-ns-get-prefix forced-prefix)))
 545               (setcdr ns-prefixes (list forced-prefix)))
 546           (setq prefer (rng-get-preferred-unused-prefix ns))
 547           (when prefer
 548             (setcdr ns-prefixes (list prefer)))
 549           ;; Unless it's an attribute with a non-nil namespace,
 550           ;; allow no prefix for this namespace.
 551           (unless rng-complete-name-attribute-flag
 552             (setcdr ns-prefixes (cons nil (cdr ns-prefixes))))))
 553       (setq iter (cdr iter)))
 554     (rng-uniquify-equal
 555      (sort (apply 'append
 556                   (cons rng-complete-extra-strings
 557                         (mapcar (lambda (name)
 558                                   (if (car name)
 559                                       (mapcar (lambda (prefix)
 560                                                 (if prefix
 561                                                     (concat prefix
 562                                                             ":"
 563                                                             (cdr name))
 564                                                   (cdr name)))
 565                                         (cdr (assoc (car name)
 566                                                     ns-prefixes-alist)))
 567                                     (list (cdr name))))
 568                                 rng-complete-target-names)))
 569            'string<))))
 570
 571 (defun rng-get-preferred-unused-prefix (ns)
 572   (let ((ns-prefix (assoc (symbol-name ns) rng-preferred-prefix-alist))
 573         iter prefix)
 574     (when ns-prefix
 575       (setq prefix (cdr ns-prefix))
 576       (when (nxml-ns-get-prefix prefix)
 577         ;; try to find an unused prefix
 578         (setq iter (memq ns-prefix rng-preferred-prefix-alist))
 579         (while (and iter
 580                     (setq ns-prefix (assoc ns iter)))
 581           (if (nxml-ns-get-prefix (cdr ns-prefix))
 582               (setq iter (memq ns-prefix iter))
 583             (setq prefix (cdr ns-prefix))
 584             nil))))
 585     prefix))
 586
 587 (defun rng-strings-to-completion-alist (strings)
 588   (mapcar (lambda (s) (cons s s))
 589           (rng-uniquify-equal (sort (mapcar 'rng-escape-string strings)
 590                                     'string<))))
 591
 592 (provide 'rng-nxml)
 593
 594 ;;; rng-nxml.el ends here