doc/help/spec-ppd.html

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  12
  13   CUPS PPD extensions specification for the Common UNIX Printing System (CUPS).
  14
  15   Copyright 1997-2006 by Easy Software Products.
  16
  17   These coded instructions, statements, and computer programs are the
  18   property of Easy Software Products and are protected by Federal
  19   copyright law.  Distribution and use rights are outlined in the file
  20   "LICENSE.txt" which should have been included with this file.  If this
  21   file is missing or damaged please contact Easy Software Products
  22   at:
  23
  24       Attn: CUPS Licensing Information
  25       Easy Software Products
  26       44141 Airport View Drive, Suite 204
  27       Hollywood, Maryland 20636 USA
  28
  29       Voice: (301) 373-9600
  30       EMail: cups-info@cups.org
  31         WWW: http://www.cups.org
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  33
  34 <h2 class='title'><a name='INTRODUCTION'>Introduction</a></h2>
  35
  36 <p>This specification describes the attributes and extensions
  37 that CUPS adds to <a
  38 href="http://partners.adobe.com/asn/developer/PDFS/TN/5003.PPD_Spec_v4.3.pdf">
  39 Adobe TechNote #5003: PostScript Printer Description File Format
  40 Specification Version 4.3</a>. PostScript Printer Description
  41 ("PPD") files describe the capabilities of each printer and are
  42 used by CUPS to support printer-specific features and intelligent
  43 filtering.</p>
  44
  45 <h2 class='title'><a name='SYNTAX'>PPD File Syntax</a></h2>
  46
  47 <p>The PPD format is text-based and uses lines of up to 255
  48 characters terminated by a carriage return, linefeed, or
  49 combination of carriage return and line feed. The following ABNF
  50 definition [RFC2234] defines the general format of lines in a PPD
  51 file:</p>
  52
  53 <pre class='command'>
  54 PPD-FILE = HEADER +(DATA / COMMENT / LINE-END)
  55
  56 HEADER   = "*" 0x50.50.44.2D.41.64.6F.62.65 ":"   ; *PPD-Adobe:
  57            *WSP DQUOTE "4.3" DQUOTE LINE-END
  58
  59 COMMENT  = "*%" *TCHAR LINE-END
  60
  61 DATA     = "*" 1*KCHAR [ WSP 1*KCHAR [ "/" 1*TCHAR ] ] ":"
  62            1*(*WSP VALUE) LINE-END
  63
  64 VALUE    = 1*TCHAR / DQUOTE 1*SCHAR DQUOTE
  65
  66 KCHAR    = ALPHA / DIGIT / "_" / "." / "-"
  67
  68 SCHAR    = LINE-END / WSP / %x21 / %x23-7E / %xA0-FF
  69
  70 TCHAR    = %x20-7E / %xA0-FF
  71
  72 LINE-END = CR / LF / CR LF
  73 </pre>
  74
  75
  76 <h2 class='title'><a name='ATTRIBUTES'>General Attributes</a></h2>
  77
  78 <h3>APDuplexRequiresFlippedMargin</h3>
  79
  80 <p class='summary'>*APDuplexRequiresFlippedMargin: boolean</p>
  81
  82 <p>This boolean attribute notifies the RIP filters that the
  83 destination printer does not require the top and bottom margins
  84 of the <tt>ImageableArea</tt> swapped for the back page. The
  85 default value is <code>true</code>.</p>
  86
  87 <p>Example:</p>
  88
  89 <pre class='command'>
  90 <em>*% Don't swap the top and bottom margins for the back side</em>
  91 *APDuplexRequiresFlippedMargin: false
  92 </pre>
  93
  94 <p>Also see the related <tt>cupsFlipDuplex</tt> attribute.</p>
  95
  96 <h3>cupsFilter</h3>
  97
  98 <p class='summary'>*cupsFilter: "source/type cost program"</p>
  99
 100 <p>This string attribute provides a conversion rule from the
 101 given source type to the printer's native format using the
 102 filter "program". If a printer supports the source type directly,
 103 the special filter program "-" may be specified.</p>
 104
 105 <p>Examples:</p>
 106
 107 <pre class='command'>
 108 <em>*% Standard raster printer driver filter</em>
 109 *cupsFilter: "application/vnd.cups-raster 100 rastertofoo"
 110
 111 <em>*% Plain text filter</em>
 112 *cupsFilter: "text/plain 10 texttofoo"
 113
 114 <em>*% Pass-through filter for PostScript printers</em>
 115 *cupsFilter: "application/vnd.cups-postscript 0 -"
 116 </pre>
 117
 118 <h3>cupsFlipDuplex</h3>
 119
 120 <p class='summary'>*cupsFlipDuplex: boolean</p>
 121
 122 <p>This boolean attribute notifies the RIP filters that the
 123 destination printer requires an upside-down image for the back
 124 page. The default value is <code>false</code>.</p>
 125
 126 <p>Example:</p>
 127
 128 <pre class='command'>
 129 <em>*% Flip the page image for the back side of duplexed output</em>
 130 *cupsFlipDuplex: true
 131 </pre>
 132
 133 <p>Also see the related <tt>APDuplexRequiresFlippedMargins</tt> attribute.</p>
 134
 135 <h3>cupsLanguages</h3>
 136
 137 <p class='summary'>*cupsLanguages: "locale list"</p>
 138
 139 <p>This attribute describes which language localizations are
 140 included in the PPD. The "locale list" string is a space-delimited
 141 list of locale names ("en", "en_US", "fr_FR", etc.)</p>
 142
 143 <p>Example:</p>
 144
 145 <pre class='command'>
 146 <em>*% Specify Canadian, UK, and US English, and Candian and French French</em>
 147 *cupsLanguages: "en_CA en_UK en_US fr_CA fr_FR"
 148 </pre>
 149
 150 <h3>cupsManualCopies</h3>
 151
 152 <p class='summary'>*cupsManualCopies: boolean</p>
 153
 154 <p>This boolean attribute notifies the RIP filters that the
 155 destination printer does not support copy generation in
 156 hardware. The default value is <code>false</code>.</p>
 157
 158 <p>Example:</p>
 159
 160 <pre class='command'>
 161 <em>*% Tell the RIP filters to generate the copies for us</em>
 162 *cupsManualCopies: true
 163 </pre>
 164
 165 <h3>cupsModelNumber</h3>
 166
 167 <p class='summary'>*cupsModelNumber: number</p>
 168
 169 <p>This integer attribute specifies a printer-specific model
 170 number. This number can be used by a filter program to adjust
 171 the output for a specific model of printer.</p>
 172
 173 <p>Example:</p>
 174
 175 <pre class='command'>
 176 <em>*% Specify an integer for a driver-specific model number</em>
 177 *cupsModelNumber: 1234
 178 </pre>
 179
 180 <h3>cupsPortMonitor</h3>
 181
 182 <p class='summary'>*cupsPortMonitor urischeme/Descriptive Text: "port monitor"</p>
 183
 184 <p>This string attribute specifies printer-specific "port
 185 monitor" filters that may be used with the printer. The CUPS
 186 scheduler also looks for the <tt>Protocols</tt> attribute to see
 187 if the <tt>BCP</tt> or <tt>TBCP</tt> protocols are supported. If
 188 so, the corresponding port monitor ("bcp" and "tbcp",
 189 respectively) is listed in the printer's
 190 <tt>port-monitor-supported</tt> attribute.</p>
 191
 192 <p>The "urischeme" portion of the attribute specifies the URI scheme
 193 that this port monitor should be used for. Typically this is used to
 194 pre-select a particular port monitor for each type of connection that
 195 is supported by the printer. The "port monitor" string can be "none"
 196 to disable the port monitor for the given URI scheme.</p>
 197
 198 <p>Examples:</p>
 199
 200 <pre class='command'>
 201 <em>*% Specify a PostScript printer that supports the TBCP protocol</em>
 202 *Protocols: TBCP PJL
 203
 204 <em>*% Specify that TBCP should be used for socket connections but not USB</em>
 205 *cupsPortMonitor socket/AppSocket Printing: "tbcp"
 206 *cupsPortMonitor usb/USB Printing: "none"
 207
 208 <em>*% Specify a printer-specific port monitor for an Epson USB printer</em>
 209 *cupsPortMonitor usb/USB Status Monitor: "epson-usb"
 210 </pre>
 211
 212 <h3>cupsVersion</h3>
 213
 214 <p class='summary'>*cupsVersion: major.minor</p>
 215
 216 <p>This required attribute describes which version of the CUPS
 217 PPD file extensions was used. Currently it must be the string
 218 "1.0", "1.1", or "1.2".</p>
 219
 220 <p>Example:</p>
 221
 222 <pre class='command'>
 223 <em>*% Specify a CUPS 1.2 driver</em>
 224 *cupsVersion: "1.2"
 225 </pre>
 226
 227
 228 <h2 class='title'><a name='OPTIONS'>Custom Options</a></h2>
 229
 230 <p>CUPS supports custom options using an extension of the
 231 <tt>CustomPageSize</tt> and <tt>ParamCustomPageSize</tt>
 232 syntax:</p>
 233
 234 <pre class='command'>
 235 *CustomFoo True: "command"
 236 *ParamCustomFoo Name1/Text 1: order type minimum maximum
 237 *ParamCustomFoo Name2/Text 2: order type minimum maximum
 238 ...
 239 *ParamCustomFoo NameN/Text N: order type minimum maximum
 240 </pre>
 241
 242 <p>When the base option is part of the <tt>JCLSetup</tt> section,
 243 the "command" string contains JCL commands with "\order"
 244 placeholders for each numbered parameter. The CUPS API handles
 245 any necessary value quoting for HP-PJL commands. For example, if
 246 the JCL command string is "@PJL SET PASSCODE=\1" and the first
 247 option value is "1234" then CUPS will output the string
 248 "@PJL SET PASSCODE=1234".</p>
 249
 250 <p>For non-<tt>JCLSetup</tt> options, the "order" value is a
 251 number from 1 to N and specifies the order of values as they are
 252 placed on the stack before the command. For example, if the
 253 PostScript command string is
 254 "&lt;&lt;/cupsReal1 2 1 roll&gt;&gt;setpagedevice" and the
 255 option value is "2.0" then CUPS will output the string
 256 "2.0 &lt;&lt;/cupsReal1 2 1 roll&gt;&gt;setpagedevice".</p>
 257
 258 <blockquote><b>Note:</b> Currently only CustomPageSize supports
 259 more than 1 parameter. This restriction is due to value encoding
 260 issues, since the "Custom.value" format does not allow for
 261 specification of named parameters. We anticipate supporting the
 262 collection value format "{Name1=foo Name2=bar}" for the final
 263 CUPS 1.2 release. In addition, the collection value format will
 264 allow string values to contain spaces.</blockquote>
 265
 266 <p>The "type" is one of the following keywords:</p>
 267
 268 <ul>
 269
 270         <li><tt>curve</tt> - a real value from "minimum" to
 271         "maximum" representing a gamma correction curve using the
 272         function: f(x) = x <sup>value</sup></li>
 273
 274         <li><tt>int</tt> - an integer value from "minimum" to
 275         "maximum"</li>
 276
 277         <li><tt>invcurve</tt> - a real value from "minimum" to
 278         "maximum" representing a gamma correction curve using the
 279         function: f(x) = x <sup>1 / value</sup></li>
 280
 281         <li><tt>passcode</tt> - a string of numbers value with a
 282         minimum of "minimum" numbers and a maximum of "maximum"
 283         numbers ("minimum" and "maximum" are numbers and passcode
 284         strings are not displayed in the user interface)</li>
 285
 286         <li><tt>password</tt> - a string value with a minimum of
 287         "minimum" characters and a maximum of "maximum"
 288         characters ("minimum" and "maximum" are numbers and password
 289         strings are not displayed in the user interface)</li>
 290
 291         <li><tt>points</tt> - a measurement value in points from
 292         "minimum" to "maximum"</li>
 293
 294         <li><tt>real</tt> - a real value from "minimum" to
 295         "maximum"</li>
 296
 297         <li><tt>string</tt> - a string value with a minimum of
 298         "minimum" characters and a maximum of "maximum"
 299         characters ("minimum" and "maximum" are numbers)</li>
 300
 301 </ul>
 302
 303 <p>Examples:</p>
 304
 305 <pre class='command'>
 306 <em>*% Base JCL key code option</em>
 307 *OpenUI JCLPasscode/Key Code: PickOne
 308 *OrderDependency: 10 JCLSetup *JCLPasscode
 309 *DefaultJCLPasscode: None
 310 *JCLPasscode None/No Code: ""
 311 *JCLPasscode 1111: "@PJL SET PASSCODE = 1111&lt;0A&gt;"
 312 *JCLPasscode 2222: "@PJL SET PASSCODE = 2222&lt;0A&gt;"
 313 *JCLPasscode 3333: "@PJL SET PASSCODE = 3333&lt;0A&gt;"
 314 *JCLCloseUI: *JCLPasscode
 315
 316 <em>*% Custom JCL key code option</em>
 317 *CustomJCLPasscode True: "@PJL SET PASSCODE = \1&lt;0A&gt;"
 318 *ParamCustomJCLPasscode Code/Key Code: 1 passcode 4 4
 319
 320
 321 <em>*% Base PostScript watermark option</em>
 322 *OpenUI WatermarkText/Watermark Text: PickOne
 323 *OrderDependency: 10 AnySetup *WatermarkText
 324 *DefaultWatermarkText: None
 325 *WatermarkText None: ""
 326 *WatermarkText Draft: "&lt;&lt;/cupsString1(Draft)&gt;&gt;setpagedevice"
 327 *CloseUI: *WatermarkText
 328
 329 <em>*% Custom PostScript watermark option</em>
 330 *CustomWatermarkText True: "&lt;&lt;/cupsString1 2 1 roll&gt;&gt;setpagedevice"
 331 *ParamCustomWatermarkText Text: 1 string 0 32
 332
 333
 334 <em>*% Base PostScript gamma/density option</em>
 335 *OpenUI GammaDensity/Gamma and Density: PickOne
 336 *OrderDependency: 10 AnySetup *GammaDensity
 337 *DefaultGammaDensity: Normal
 338 *GammaDensity Normal/Normal: "&lt;&lt;/cupsReal1 1.0/cupsReal2 1.0&gt;&gt;setpagedevice"
 339 *GammaDensity Light/Lighter: "&lt;&lt;/cupsReal1 0.9/cupsReal2 0.67&gt;&gt;setpagedevice"
 340 *GammaDensity Dark/Darker: "&lt;&lt;/cupsReal1 1.1/cupsReal2 1.5&gt;&gt;setpagedevice"
 341 *CloseUI: *GammaDensity
 342
 343 <em>*% Custom PostScript gamma/density option</em>
 344 *CustomGammaDensity True: "&lt;&lt;/cupsReal1 3 1 roll/cupsReal2 3 1&gt;&gt;setpagedevice"
 345 *ParamCustomGammaDensity Gamma: 1 curve 0.1 10
 346 *ParamCustomGammaDensity Density: 2 real 0 2
 347 </pre>
 348
 349
 350 <h2 class='title'><a name='PROFILES'>Color Profiles</a></h2>
 351
 352 <p>CUPS supports two types of color profiles. The first type is
 353 based on sRGB and is used by the standard CUPS raster filters and
 354 ESP Ghostscript. The second type is based on ICC profiles and is
 355 used by the Core Graphics-based filters on MacOS X.</p>
 356
 357 <blockquote><b>Note:</b> At this time, none of the CUPS raster
 358 filters support ICC profiles. This will be addressed as time
 359 and resources permit.</blockquote>
 360
 361 <h3>cupsColorProfile</h3>
 362
 363 <p class='summary'>*cupsColorProfile Resolution/MediaType: "density
 364 gamma m00 m01 m02 m10 m11 m12 m20 m21 m22"</p>
 365
 366 <p>This string attribute specifies an sRGB-based color profile
 367 consisting of gamma and density controls and a 3x3 CMY color
 368 transform matrix.</p>
 369
 370 <p>The <i>Resolution</i> and <i>MediaType</i> values may be "-"
 371 to act as a wildcard. Otherwise they must match one of the
 372 <tt>Resolution</tt> or <tt>MediaType</tt> attributes defined in
 373 the PPD file.</p>
 374
 375 <p>The <i>density</i> and <i>gamma</i> values define gamma and
 376 density adjustment function such that:</p>
 377
 378 <pre class='command'>
 379 f(x) = density * x <sup style='font-size: 100%'>gamma</sup>
 380 </pre>
 381
 382 <p>The <i>m00</i> through <i>m22</i> values define a 3x3
 383 transformation matrix for the CMY color values. The density
 384 function is applied <i>after</i> the CMY transformation:</p>
 385
 386 <pre class='command'>
 387 | m00 m01 m02 |
 388 | m10 m11 m12 |
 389 | m20 m21 m22 |
 390 </pre>
 391
 392 <p>Examples:</p>
 393
 394 <pre class='command'>
 395 <em>*% Specify a profile for printing at 360dpi on all media types</em>
 396 *cupsColorProfile 360dpi/-: "1.0 1.5 1.0 0.0 -0.2 -0.4 1.0 0.0 -0.2 0.0 1.0"
 397
 398 <em>*% Specify a profile for printing at 720dpi on Glossy media</em>
 399 *cupsColorProfile 720dpi/Glossy: "1.0 2.5 1.0 0.0 -0.2 -0.4 1.0 0.0 -0.2 0.0 1.0"
 400
 401 <em>*% Specify a default profile for printing at all other resolutions and media types</em>
 402 *cupsColorProfile -/-: "0.9 2.0 1.0 0.0 -0.2 -0.4 1.0 0.0 -0.2 0.0 1.0"
 403 </pre>
 404
 405 <h3>cupsICCProfile</h3>
 406
 407 <p class='summary'>*cupsICCProfile
 408 ColorModel.MediaType.Resolution/Description: "filename"</p>
 409
 410 <p>This attribute specifies an ICC color profile that is
 411 used to convert the document colors to the device
 412 colorspace. The <tt>ColorModel</tt>, <tt>MediaType</tt>, and
 413 <tt>Resolution</tt> keywords specify a selector for color
 414 profiles. If omitted, the color profile will match any option
 415 keyword for the corresponding main keyword.</p>
 416
 417 <p>The <tt>Description</tt> specifies human-readable text that
 418 is associated with the color profile. The <tt>filename</tt>
 419 portion specifies the ICC color profile to use; if the filename
 420 is not absolute, it is loaded relative to the
 421 <var>/usr/share/cups/profiles</var> directory.</p>
 422
 423 <p>Examples:</p>
 424
 425 <pre class='command'>
 426 <em>*% Specify a profile for CMYK printing at 360dpi on all media types</em>
 427 *cupsICCProfile CMYK..360dpi/360dpi CMYK: "vendor/foo-360-cmyk.icc"
 428
 429 <em>*% Specify a profile for RGB printing at 720dpi on Glossy media</em>
 430 *cupsColorProfile RGB.Glossy.720dpi/720dpi Glossy: "vendor/foo-720-glossy-rgb.icc"
 431
 432 <em>*% Specify a default profile for printing at all other resolutions and media types</em>
 433 *cupsICCProfile ../Default: "vendor/foo-default.icc"
 434 </pre>
 435
 436 <h4>Customizing the Profile Selection Keywords</h4>
 437
 438 <p>The <tt>ColorModel</tt>, <tt>MediaType</tt>, and
 439 <tt>Resolution</tt> keywords can be reassigned to different main
 440 keywords, allowing drivers to do color profile selection based
 441 on different parameters. The <tt>cupsICCQualifier1</tt>,
 442 <tt>cupsICCQualifier2</tt>, and <tt>cupsICCQualifier3</tt>
 443 attributes define the mapping from selector to main keyword:</p>
 444
 445 <pre class='command'>
 446 *cupsICCQualifier1: MainKeyword
 447 *cupsICCQualifier2: MainKeyword
 448 *cupsICCQualifier3: MainKeyword
 449 </pre>
 450
 451 <p>The default mapping is as follows:</p>
 452
 453 <pre class='command'>
 454 *cupsICCQualifier1: ColorModel
 455 *cupsICCQualifier2: MediaType
 456 *cupsICCQualifier3: Resolution
 457 </pre>
 458
 459
 460 <h2 class='title'><a name='I18N'>Globalized PPD Support</a></h2>
 461
 462 <p>CUPS 1.2 and higher adds support for PPD files containing multiple
 463 languages by following the following additional rules:</p>
 464
 465 <ol>
 466
 467         <li>The <tt>LanguageVersion</tt> MUST be <tt>English</tt></li>
 468
 469         <li>The <tt>LanguageEncoding</tt> MUST be <tt>ISOLatin1</tt></li>
 470
 471         <li>The <tt>cupsLanguages</tt> attribute MUST be provided and
 472         list each of the supported locales in the PPD file</li>
 473
 474         <li>Main and option keywords MUST NOT exceed 34 (instead of 40)
 475         characters to allow room for the locale prefixes in translation
 476         attributes</li>
 477
 478         <li>The main keyword "Translation" MUST NOT be used</li>
 479
 480         <li>Translation strings included with the main and option
 481         keywords MUST NOT contain characters outside the ASCII
 482         subset of ISOLatin1 and UTF-8; developers wishing to use
 483         characters outside ASCII MUST provide a separate set of
 484         English localization attributes for the affected keywords.</li>
 485
 486         <li>Localizations are specified using a locale prefix of
 487         the form "ll" or "ll_CC." where "ll" is the 2-letter ISO
 488         language code and "CC" is the 2-letter ISO country
 489         code</li>
 490
 491         <li>Locale-specific translation strings MUST be encoded
 492         using UTF-8.</li>
 493
 494         <li>Main keywords MUST be localized using one of the
 495         following forms:
 496         <p><tt>*ll.Translation MainKeyword/translation
 497         text: ""</tt><br />
 498         <tt>*ll_CC.Translation MainKeyword/translation
 499         text: ""</tt></p></li>
 500
 501         <li>Option keywords MUST be localized using one of the
 502         following forms:
 503         <p><tt>*ll.MainKeyword OptionKeyword/translation
 504         text: ""</tt><br />
 505         <tt>*ll_CC.MainKeyword OptionKeyword/translation
 506         text: ""</tt></p></li>
 507
 508         <li>Localization attributes MAY appear anywhere after the
 509         first line of the PPD file</li>
 510
 511 </ol>
 512
 513 <blockquote><b>Note:</b>
 514 We use a <tt>LanguageEncoding</tt> value of <tt>ISOLatin1</tt>
 515 and limit the allowed base translation strings to ASCII to avoid
 516 character coding issues that would otherwise occur. In addition,
 517 requiring the base translation strings to be in English allows
 518 for easier fallback translation when no localization is provided
 519 in the PPD file for a given locale.</blockquote>
 520
 521 <p>Examples:</p>
 522
 523 <pre class='command'>
 524 *LanguageVersion: English
 525 *LanguageEncoding: ISOLatin1
 526 *cupsLanguages: "de_DE fr_FR"
 527 *ModelName: "Foobar Laser 9999"
 528
 529 <em>*% Localize ModelName for French and German</em>
 530 *fr_FR.Translation ModelName/La Foobar Laser 9999: ""
 531 *de_DE.Translation ModelName/Foobar LaserDrucken 9999: ""
 532
 533 ...
 534
 535 *OpenUI *InputSlot/Paper Source: PickOne
 536 *OrderDependency: 10 AnySetup *InputSlot
 537 *DefaultInputSlot: Auto
 538 <em>*% Localize InputSlot for French and German</em>
 539 *fr_FR.Translation InputSlot/Papier source: ""
 540 *de_DE.Translation InputSlot/Papiereinzug: ""
 541 *InputSlot Auto/Default: "&lt;&lt;/ManualFeed false&gt;&gt;setpagedevice"
 542 <em>*% Localize InputSlot=Auto for French and German</em>
 543 *fr_FR.InputSlot Auto/Par Defaut: ""
 544 *de_DE.InputSlot Auto/Standard: ""
 545 *InputSlot Manual/Manual Feed: "&lt;&lt;/ManualFeed true&gt;&gt;setpagedevice"
 546 <em>*% Localize InputSlot=Manual for French and German</em>
 547 *fr_FR.InputSlot Manual/Manuel mecanisme de alimentation: ""
 548 *de_DE.InputSlot Manual/Manueller Einzug: ""
 549 *CloseUI: *InputSlot
 550 </pre>
 551
 552
 553 <h2 class='title'><a name='HISTORY'>Change History</a></h2>
 554
 555 <h3>Changes in CUPS 1.2</h3>
 556
 557 <ul>
 558
 559         <li>Added globalization support attributes</li>
 560
 561         <li>Added custom option values support</li>
 562
 563         <li>Added <tt>APDuplexRequiresFlippedMargin</tt> attribute</li>
 564
 565         <li>Added <tt>cupsICCProfile</tt> attribute</li>
 566
 567         <li>Added <tt>cupsLanguages</tt> attribute</li>
 568
 569         <li>Added <tt>cupsPortMonitor</tt> attribute</li>
 570
 571         <li>Removed <tt>cupsProtocol</tt> attribute</li>
 572
 573 </ul>
 574
 575 <h3>Changes in CUPS 1.1</h3>
 576
 577 <ul>
 578
 579         <li>Added <tt>cupsFlipDuplex</tt> attribute</li>
 580
 581         <li>Added <tt>cupsProtocol</tt> attribute</li>
 582
 583 </ul>
 584
 585 </body>
 586 </html>