Reference number ISO 1 5930 5 2003(E) © ISO 2003 INTERNATIONAL STANDARD ISO 1 5930 5 First edition 2003 1 2 1 5 Graphic technology — Prepress digital data exchange using PDF — Part 5 Partial exchange[.]
INTERNATIONAL STANDARD I SO 5930 -5 First edition 2003-1 2-1 G rap h i c tech n ol og y — P repres s d i g i tal d ata e xch an g e u s i n g P D F — Part 5: P arti al exch an g e of pri n ti n g d a ta u s i n g P D F (P D F /X-2 ) Technologie graphique — Échange de données numériques de préimpression utilisant le PDF — Partie 5: Échange partiel de données d'impression utilisant le PDF 1.4 (PDF/X-2) Reference number ISO 5930-5:2003(E) © ISO 2003 I S O 5930 -5: 0 3(E) P D F d i s cl m er This PDF file may contain embedded typefaces In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy The ISO Central Secretariat accepts no liability in this area Adobe is a trademark of Adobe Systems Incorporated Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing Every care has been taken to ensure that the file is suitable for use by ISO member bodies In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below © ISO 2003 All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester ISO copyright office Case postale 56 • CH-1 21 Geneva 20 Tel + 41 22 749 01 1 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland ii © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) Page C on ten ts F oreword i v I n trod u cti on v S cope N orm ati ve referen ces Term s , abbrevi ated te rm s an d d efi n i ti on s N otati on s C on form i n g fi l es an d eq u i pm en t Tech n i cal req u i rem en ts G en eral D ata s tru ctu re P D F fi l e i d en ti fi cati on E xtern al l y refe ren ced el e m en ts 6 F i l e s pe ci fi cati on s 6 Trappi n g An n e x A (informative) P D F featu re s u m m ary B i bl i og raph y 1 © ISO 2003 – All rights reserved iii I S O 5930 -5: 0 3(E) F oreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work of preparing International Standards is normally carried out through ISO technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part The main task of technical committees is to prepare International Standards Draft International Standards adopted by the technical committees are circulated to the member bodies for voting Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights ISO shall not be held responsible for identifying any or all such patent rights ISO 5930-5 was prepared by Technical Committee ISO/TC 30, Graphic technology, with the support of ANSI Committee for Graphic Arts Technologies Standards (CGATS) ISO 5930 consists of the following parts, under the general title Graphic technology — Prepress digital data exchange using PDF: iv Part : Complete exchange using CMYK data (PDF/X-1 and PDF/X-1a) ; Part 3: Complete exchange suitable for colour-managed workflows (PDF/X-3) ; Part 4: Complete exchange of CMYK and spot colour printing data using PDF 1.4 (PDF/X-1a) ; Part 5: Partial exchange of printing data using PDF 1.4 (PDF/X-2) ; Part 6: Complete exchange of printing data suitable for colour-managed workflows using PDF 1.4 (PDF/X-3) © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) I n trod u cti on ISO 5930 (all parts) defines methods for the exchange of digital data within the graphic arts industry and for the exchange of files between graphic arts establishments It is a multi-part document where each part is intended to respond to different workflow requirements These workflows differ in the degree of flexibility required However, increasing flexibility can lead to the possibility of uncertainty or error The goal throughout the various parts of ISO 5930 has been to maintain the degree of flexibility required while minimizing the uncertainty Many printed documents are assemblies of partial pages and/or pages created at different locations and by different organizations The merging of these individual elements into the final printing forme and the subsequent printing may take place at different locations Some of these elements may also be routed to multiple sites for incorporation into other documents Each of these elements is referred to in ISO 5930 as a compound entity A variety of data formats and structures are used for the creation of this type of material, but with two prevalent kinds of underlying data structures These are vector-based data for the encoding of line art and textual information and raster-based data for the encoding of image information, including previously rasterized line art and textual information Both kinds of data structures are required along with page-description information in an open electronic workflow The exchange of raster-based data using the TIFF/IT file format is defined in ISO 2639 The subject of ISO 5930 is a format for the exchange of object-based data where individual objects may be in either vector or raster data structures PDF/X-2 (Part of this International Standard) complements the other parts by defining a data format and its usage to permit the predictable dissemination of a compound entity to one or more locations, as colourmanaged data, CMYK data, and/or spot colour data, by transfer of a file with some elements not included, but with provision for unique identification An exchange identified by this part of this International Standard will often require communication between sender and receiver to select the mechanism by which elements not included may be identified These goals are accomplished by defining a specific use of the publicly available Adobe Portable Document In order to achieve a level of exchange that avoids any ambiguity in interpretation of the file, a limited set of PDF objects that may be used is identified and restrictions to the use, or form of use, of those objects, and/or keys within those objects are added Format While PDF/X-2 (this part of this International Standard) defines a data format and its usage to permit the predictable dissemination of a compound entity to one or more locations where some or all of the elements may be more logically present at the receiving site, or may be exchanged at a different time, there are circumstances when this is not appropriate PDF/X-1 a (Parts and of this International Standard) and PDF/X-3 (Parts and of this International Standard) specify methods for the exchange of material in which all elements and element resources are present as part of a single exchange and all of the information needed to process the material is either in the file or is specified within the appropriate part of this International Standard and its normative references It is anticipated that a variety of products will be developed around PDF/X, such as readers (including viewers) and writers of PDF/X files, and products that offer combinations of these features Different products will incorporate various capabilities to prepare, interpret and process conforming files based on the application needs as perceived by the suppliers of the products However, it is important to note that a conforming reader must be able to read and appropriately process all files conforming to a specified conformance level An ongoing series of Application Notes [2] is maintained for the guidance of developers and users of the PDF/X family of International Standards These Application Notes, and other documents relevant to PDF/X, are available from NPES The Association for Suppliers of Printing, Publishing and Converting Technologies in the NPES Standards Workroom at © ISO 2003 – All rights reserved v I N TE RN ATI O N AL S TAN D ARD I S O 59 30 -5: 0 3(E) Graphic technology — Prepress digital data exchange using PDF — Part 5: Partial exchange of printing data using PDF (PDF/X-2) S cope This part of ISO 5930 specifies the use of the Portable Document Format (PDF) Version for the dissemination of digital data, where all elements necessary for final print reproduction are either included or provision is made for unique identification Colour-managed, CMYK, and spot colour data are supported in any combination N orm ati ve referen ces The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies ISO 5930-1 :2001 , Graphic technology — Prepress digital data exchange — Use of PDF — Part 1: Complete exchange using CMYK data (PDF/X-1 and PDF/X-1a) ISO 5930-3:2002, Graphic technology — Prepress digital data exchange — Use of PDF — Part 3: Complete exchange suitable for colour managed workflows (PDF/X-3) ISO 5930-4:2003, Graphic technology — Prepress digital data exchange using PDF — Part 4: Complete exchange of CMYK and spot colour printing data using PDF 1.4 (PDF/X-1a) ISO 5930-6:2003, Graphic technology — Prepress digital data exchange using PDF — Part 6: Complete exchange of printing data suitable for colour managed workflows using PDF 1.4 (PDF/X-3) ISO/IEC 1 578:1 996, Information technology — Open Systems Interconnection — Remote Procedure Call (RPC) DCE 1 : Remote Procedure Call Open Group Technical Standard Document Number C706, August 997 PDF Reference: Adobe Portable Document Format Version 1.4, 3rd Ed., Adobe Systems Incorporated (ISBN 0-201 -75839-3) PDF Reference: Adobe Portable Document Format, Version 1.4 errata dated 2003/06/18 Available from Internet XMP, Extensible Metadata Platform, Version 1.5, September 4, 2001 , Adobe Systems Incorporated Available from Internet © ISO 2003 – All rights reserved I S O 5930 -5: 0 3(E) Term s , abbrevi ated term s an d d efi n i ti on s For the purposes of this document, the following terms and definitions apply ch aracteri zed p ri n ti n g co n d i ti on printing condition (offset, gravure, flexographic, direct, etc.) for which process control aims are defined and for which the relationship between input data (printing tone values, usually CMYK) and the colorimetry of the printed image is documented NOTE The relationship between input data (printing tone values) and the colorimetry of the printed image is commonly referred to as characterization NOTE It is generally preferred that the process control aims of the printing condition and the associated characterization data be made publicly available via the accredited standards process or industry trade associations com p ou n d en ti ty unit of work with all text, graphics, and page elements prepared for final distribution, representing a single page, a portion of a page, or a combination of pages, whose contents may reside in one or more computer files, uniquely linked together 3 form an ce l evel identified set of restrictions and requirements with which files, readers and writers must comply el em en t substructure of a compound entity relative to the current processing environment, such as a block of text, a contone picture or an outline graphic that, by itself, comprises the smallest logical composed unit of a compound entity fon t identified collection of graphics that may be glyphs or other graphic elements Note design ISO/IEC 9541 -1 defines glyph as a recognizable abstract graphic symbol that is independent of any specific F P O fi l e file containing a low-resolution rendition of, and information about, the full resolution file from which it was derived, used for placement in design applications n on -p ri n t el em en t element not intended for final print reproduction, including proxies and all annotations of types other than and Trap N et P ri n te rM ark p arti al exch an g e exchange of composite entities in which some elements or element resources are intentionally excluded from the exchange, and are separately available EXAMPLE High-resolution images PDF Portabl e D ocu m en t F orm at file format defined in the PDF Reference © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) PD F d i cti on a ry associative table containing key-value pairs, specifying the name and value of an attribute for objects, which is generally used to collect and tie together the attributes of a complex object 1 P D F /X-1 a: 0 PDF/X-1 a conformance level defined in ISO 5930-1 :2001 P D F /X-1 a: 0 PDF/X-1 a conformance level defined in ISO 5930-4:2003 3 P D F /X-2 : 0 PDF/X-2 conformance level defined in this part of ISO 5930 P D F /X-3: 0 PDF/X-3 conformance level defined in ISO 5930-3:2002 P D F /X-3: 0 PDF/X-3 conformance level defined in ISO 5930-6:2003 p ri n t el em en t element intended for final print reproduction including Trap N et or Pri n te rM ark p ri n ti n g ton e val u e data value corresponding to the relative area of a printing surface that is intended to transfer ink to the substrate being printed NOTE See ch aracteri zed pri n ti n g d i ti on ( 3.1 ) p roxy visible placeholder representing at least the size and shape of the area to be replaced by the referenced object and may be something as basic as a rectangle of the appropriate size containing no image content, or may be a partial or complete representation of the intended content read e r software application that is able to read and appropriately process files s pot col ou r single colorant, identified by name, whose printing tone values are specified independently from colour values specified in a colour coordinate system trapp i n g modification of boundaries of colour areas to account for dimensional variations in the printing process by overprinting in selected colours at the boundaries between colours that might inadvertently be left uncoloured due to normal variations of printing press registration NOTE Trapping is sometimes referred to as chokes and spreads or grips This is not the same as ink trapping © ISO 2003 – All rights reserved I S O 5930 -5: 0 3(E) 2 U U I D s tyl e I D 28-bit number that is virtually guaranteed to be globally unique, e.g with the probability of a duplication so enormously remote as to be effectively impossible 3 wri ter software application that is able to write files N otati on s PDF operators, PDF keywords, the names of keys in PDF dictionaries, and other predefined names are written in a bold sans serif type font; for example, the key G TS _P D F XVers i on Operands of PDF operators or values of dictionary keys are written in an italic sans serif font; for example the value for the key (PDF/X-2:2003) G TS _PD F XVe rsi on For the purpose of this part of ISO 5930, references to the “ PDF Reference” are to the corrected by the errata dated 2003/6/1 (see Clause 2) PDF Reference: Adobe Portable Document Format C on form i n g fi l es an d eq u i pm en t This part of this International Standard specifies the use of the PDF file format for the partial exchange of digital data representing a compound entity Partial exchange means that components of the compound entity might not be included in the PDF/X-2 file, but that sufficient information can be made available to uniquely identify the missing elements Unique identification may be completely and automatically resolvable using references in the PDF/X-2 file and its components, or they may require additional communication between sender and receiver to establish the identity with certainty Neither the version number in the first line of a PDF file, nor the value of the key in the of a PDF file shall be used in determining whether a file is in accordance with this part of this International Standard Ve rsi on C atal og A conforming PDF/X-2 file is a PDF file in which those features necessary for the exchange of a compound entity are in accordance with this part of this International Standard A conforming file may also include other valid PDF features that not affect the reproduction of the compound entity A conforming writer is a software application that shall be able to write conforming PDF/X-2 files A conforming reader is a software application that shall be able to read and appropriately process all conforming PDF/X-2, PDF/X-1 a:2001 , PDF/X-1 a:2003, PDF/X-3:2002, and PDF/X-3:2003 files Although PDF Reference permits compliance with earlier versions of PDF, features described in versions of the PDF specification earlier than 4, but not described in PDF Reference, should not be used in a conforming PDF/X-2 file Such features may be ignored by a PDF/X-2 reader All conforming readers shall parse all PDF files but may ignore those features not required by this part of ISO 5930 A reader may ignore an annotation’s Print flag except for those in a TrapNet annotation Rendering of conforming files shall be performed as defined in the PDF Reference and as restricted by this part of this International Standard To the extent that the PDF Reference and this part of this International Standard permit more than one rendering of a conforming file, a conforming reader may use embedded jobticket or metadata information to control the rendering of the file more precisely © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) EXAMPLE (Trapping) If a conforming PDF/X-2 file specifies = False, a conforming reader may use job ticket information to determine details of how the file is to be trapped If the file specifies = True, a conforming reader is required to ignore any trapping information in an embedded job ticket Trapped Trapp ed EXAMPLE (Screening) A conforming reader may use embedded job ticket information to determine the screening to be used to render the file Note that a conforming PDF/X-2 reader is permitted to ignore screening information in the PDF/X-2 file A conforming reader may use screening data from the PDF/X-2 file, from the job ticket, or from local system defaults 6 Tech n i cal req u i re m en ts G en eral The requirements of ISO 5930-6:2003, 6.2, 6.3, 6.5 and 6.8 through 6.1 shall apply D ata s tru ctu re A PDF/X-2 file consists of four sections: header, body, cross-reference table, and trailer The body of a PDF/X-2 file contains a sequence of numbered objects (such as numbers, names, strings, dictionaries and streams) representing the text characters, graphics, images and their associated resources describing the compound entity being exchanged These features shall be used as prescribed in the PDF Reference and as further specified by this part of this International Standard In order to achieve the requirements of a reliable exchange, the use of a pre-separated PDF file (where the separations for each page are described as separate page objects, each painting only a single colorant) shall not be permitted NOTE This does not prohibit the use of pre-separated workflows in which the separations of a page are combined into a single PDF page object A PDF/X-2 file may contain two classes of elements: those intended for final print reproduction (print elements), and those not intended for final print reproduction (non-print elements) Non-print elements include such incidental elements as non-printing annotations All components of a compound entity shall be contained in the body of a single PDF/X-2 file, or identified as specified in 6.4 Print elements, whether included directly or identified within the body of the PDF/X-2 file, shall be properly prepared for the characterized printing condition identified, in accordance with ISO 5930-6:2003, 6.2.2 Non-print elements may make use of any PDF colour space PD F fi l e i d en ti fi cati on A PDF/X-2 file shall be so identified using the value of the key is string G TS _P D F XVers i on key in the I n fo dictionary The type of the G TS _PD F XVe rsi on The value of the Standard is (PDF/X-2:2003) G TS _P D F XVe rsi on key for files prepared in accordance with this part of this International All PDF/X-2 files shall contain the following key value pairs in the appropriate data prior to exchange: , , and for any of these three keys C re ati on D ate The values of the C re ator and Prod u cer M od D ate keywords in the If the PDF file is modified, the value of its dictionary should also be updated M od D ate I n fo I n fo dictionary and their values shall contain A zero-length string is not appropriate Ti tl e dictionary should be filled in prior to exchange key shall be updated and any metadata stream in the C atal og © ISO 2003 – All rights reserved I S O 5930 -5: 0 3(E) NOTE If the value of the key in the dictionary does not match the modification date in the metadata for the document, it indicates to other applications that either the metadata or the dictionary is possibly outdated M od D ate I n fo I n fo The key in the shall be present Document creators are strongly encouraged to ensure that the ID in the trailer is likely to be unique; for example, by following the recommendations in the PDF Reference ID trai l er E xtern al l y referen ced el em en ts Arch i tectu re Where print content is omitted from the PDF/X-2 file, the file shall contain a proxy, encoded as a , for each such instance The proxy shall use the mechanism described in PDF Reference to include a pointer to the target of the element replacement The reference dictionary shall include the key F orm XO bj ect Referen ce XO b j ect ID The proxy may also include a preview, which would normally be derived from the data carried in an FPO file The O PI key shall not be used in F orm or I m ag e XO b j ects in a conforming PDF/X-2 file The target document of the shall be a PDF/X-1 a:2001 , PDF/X-1 a:2003, PDF/X-3:2002, PDF/X-3:2003 or PDF/X-2:2003 file Where the target is a PDF/X-2:2003 file, there shall be no circular references Referen ce XO b j ect NOTE It may not be possible for writers to enforce this prohibition; therefore, practically, it falls to the reader to check for this condition because it has access to all of the files I d en ti fi cati on of targ et d o cu m en ts The dictionary of the target of the shall contain the key The metadata , stream that forms the value of that key shall conform to XMP and shall contain the and properties In most instances the value of the will be “default” C atal og Referen ce XO bj ect M etad ata xapM M : D ocu m en tI D xapM M : Vers i on I D xapM M : Ren d i ti on C l as s xapM M : Ren d i ti on C l ass NOTE The the This requirement is in addition to the requirements of the relevant PDF/X conformance level F orm in the document that contains the key for the shall also include key, the value of which shall be a metadata stream The metadata stream shall contain a property, the value of which is a element, which shall include the , and properties XO bj e ct M etad ata Ref xap M M : Ren d i ti on Of xap M M : D ocu m en tI D Referen ce XO bj e ct Res ou rceRef xap M M : Vers i on I D xapM M : Ren d i ti on C l as s The value of the properties shall be a UUID style ID (a 28-bit number), and should be generated in such a way that there is a high probability that it is unique There are various common schemes for generating a unique identifier While this part of this International Standard does not require any specific scheme for generating a unique identifier, the algorithms set out in ISO/IEC 1 578:1 996 and DCE 1 should be used xapM M : Docu m en tI D The metadata streams that form the value of the keys in the dictionary of the target, and in the of the containing document may contain additional properties M etad ata C atal og F orm XO b j e ct S el e cti on of exte rn al d ocu m en ts This International Standard does not specify the mechanism by which a PDF/X-2 reader will locate candidate target files, although it is expected that the reference dictionary will be used in that process PDF/X-2 files are intended to be usable across platforms and languages Care should be taken to follow the recommendations for portability of file specifications set out in the PDF Reference © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) Once a candidate target has been located, the PDF/X-2 reader shall compare the in the in the of the candidate target, and shall compare the properties of containing file with the , properties in the candidate target’s dictionary determine if it is the correct target ID ID trai l er Ref object with the in the and in order to xapM M : Ren d i ti on Of Refere n ce XO bj ect xapM M : D ocu m en tI D xapM M : Ren d i ti on C l as s xapM M : Versi on I D C atal og M etad ata If the values of the keys and , and properties are all identical, then the reader shall treat the candidate target as an exact match to the document for which the initial metadata was created ID If the xapM M : D ocu m en tI D xap M M : Vers i on I D xap M M : Ren d i ti on C l as s properties or the first string of the value of each are identical, but the or properties, or the second string of the value of the keys are different, then the reader shall treat the candidate target as a different instance of the document for which the initial metadata was created xapM M : D ocu m en tI D xap M M : Vers i on I D ID xap M M : Ren d i ti on C l as s ID Some workflows will require that the proxy be replaced with exactly the same target file for which the initial metadata was created In others, such as those where page design and image retouching are performed in parallel, the proxy should be replaced with a different version derived from that original file 4 Ren d eri n g of extern al d o cu m en ts All print content in the PDF/X-2 file and in all targets shall be prepared for the same characterized printing condition NOTE If the PDF/X-2 documents and/or one or more target PDF/X-2 or PDF/X-3 documents contain objects in device-independent colour spaces, and if the profiles embedded in the in those files are not identical, then the colours in those files must be transformed as part of any assembly process to ensure that the correct gamut and tone compression is performed for each entity Ou tpu tI n ten ts A PDF/X-2 compliant reader that renders the file shall so using all external data in target documents NOTE This means that a PDF/X-2 compliant proof cannot be generated in the absence of one or more of the target documents A PDF/X-2 reader that renders the file shall render the containing document and each target document using the fonts embedded in that specific file; the fonts embedded in one file shall not be used to render text from a different file Overprinting within and between content from the containing document and each target document shall be applied as defined in the PDF Reference Coordinates in the entry of the proxy of the target document B B ox F orm XO b j ect are relative to the lower left corner of the M ed i aB ox F i l e s peci fi cati on s A PDF/X-2 file shall not contain file specifications as described in PDF Reference, 3.1 0, except as defined in 6.4 6 Trappi n g The Trapped key contained in the Info dictionary shall be used when exchanging files The Trapped key indicates the state of trapping within the PDF/X-2 file itself, but does not indicate the trapped state of referenced files or between objects within any combination of the PDF/X-2 file and referenced files If all print elements within the PDF/X-2 file have been trapped as necessary, then the value of the Trapped key shall be set to True Otherwise, the value of the Trapped key shall be set to False Partially trapped files are not permitted A value of Unknown for the Trapped key is prohibited in PDF/X-2 files © ISO 2003 – All rights reserved I S O 5930 -5: 0 3(E) If a file contains a TrapNet annotation, the value of the Trapped key in the Info dictionary shall be True NOTE If the page contents are edited after the creation of a longer be valid TrapNet annotation, the TrapNet annotation will no The key in a annotation either shall not be present or shall be an empty array In a PDF/X-2 conforming file, the value of the key in the appearance dictionary of a annotation shall match the colour space used by the characterized printing condition identified in the PDF/X output intent object F on tF au xi n g TrapN et PCM Trap N et © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) An n ex A (informative) P D F featu re s u m m ary Table A.1 lists those PDF objects, and keys within those objects, where the requirements of PDF/X-2 vary from those of the PDF Reference Each record in the table notes the status of the object, or key, and the section of this specification where the status is defined The following statuses are used: Required Prohibited Restricted Recommended A PDF/X-2 file shall contain this object or key A PDF/X-2 file shall not contain this object or key Certain values or combinations of values with contents are required or prohibited See the section(s) referenced for full details It is recommended that all PDF/X-2 files include this key A PDF/X-2 file also conforms to the PDF Reference; that is, it includes all objects, keys and values noted as required in that manual, and may not contain objects, keys or values that are prohibited by the manual singly or in combination A conforming reader may support all other objects, keys and values as defined in the normative references specifying PDF file structure as desired If a reference to a PDF dictionary object is included in the table, but keys within that object are not explicitly listed, then all keys within that object and its descendants (if any) inherit their status from the item that is shown in the table If any key within a dictionary object is explicitly listed in the table, then a conforming reader is not required to support any other keys (or their descendants) within that object type unless they are required by the PDF Reference, neither are other keys prohibited An object is descendant from another object (called the ancestor) if one of the following holds: a) it is the value of a key in the ancestor object; b) the ancestor object is an array and the descendant object is an element of that array; c) the descendant object is a descendant of a descendant of the ancestor object If a key or object is noted as required, all ancestor objects required to access it from the document's are also required; e.g the key in the object is required, therefore the object itself is required trai l er Trap p ed I n fo All operators defined in the normative references for use in PDF PDF/X-2 file, except for (execute in-line PostScript; see 6.1 ) I n fo C on ten ts streams may be included in a PS The following are operators that a conforming reader is expected to parse in a stream, but is not required to act on beyond removing appropriate numbers of objects from the operand stack begin section where undefined page operators are not reported; end section where undefined page operators are not reported; begin marked content; begin marked content with property list; end marked content; mark point; mark point with property list C on ten ts BX EX BM C BDC EM C MP DP © ISO 2003 – All rights reserved I S O 5930 -5: 0 3(E) Tab l e A — PD F obj e cts for wh i ch th e PD F /X-2 req u i rem en ts vary from th e Obj ects Trai l er Ke ys ID C reati on D ate C reator G TS _P D F XVers i on M od D ate P rod u cer Ti tl e Trap ped C atal og Ou tpu tI n ten ts P ag e ArtB ox Tri m B ox Res ou rces C ol orS pace P S XObj ect Al tern ate I m ag e XObj ect E xtG S tate H TP HT TR TR2 BM CA ca S M as k F on t F on tD es cri p tor F on tD es cri p tor S tatu s Referen ces Required Prohibited Required Recommended Required Required Recommended Required Required Required Restricted Restricted Restricted Prohibited Restricted (Halftone Phase) Prohibited (Halftone) Restricted (Transfer Function) Prohibited (Transfer Function) Prohibited Restricted Restricted Restricted Restricted Required if text in fonts other than Type is used or or Required if text in Type , Truetype, or Type Compact font is used, depending on font type a Prohibited Restricted Restricted Restricted Prohibited Restricted Prohibited Restricted Restricted Prohibited Restricted Restricted Restricted Required Required E n cryp t I n fo PDF reference F on tF i l e F on tF i l e2 6.1 , 6.3 6.1 6.3 6.3 6.3 6.3 6.3 6.3 6.6 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 6.1 F on tF i l e3 F orm XOb j ect OPI M etad ata G rou p S u btyp e2 I m ag e XObj ect OPI Al tern ate i m ag e Action Dictionaries annotation TrapN et All F on tF au xi n g PCM JavaScripts Annotations File specification Streams Reference dictionary All All All F i l ter ID M etad ata a 6.4.1 6.4.2 6.1 6.1 6.4.1 6.1 6.1 6.6 6.6 6.1 6.1 6.4, 6.5 6.1 6.4.1 6.4.2 Type Compact fonts are sometimes described as CFF fonts 10 © ISO 2003 – All rights reserved I S O 59 30 -5: 0 3(E) B i bl i og raph y [1 ] ISO/IEC 9541 -1 , Information technology — Font information interchange — Part 1: Architecture , http://www.npes.org/standards/tools.html [2] Application Notes for PDF/X Standards [3] Adobe Technical Note #5620, Portable Job Ticket Format © ISO 2003 – All rights reserved , April 999, Adobe Systems Incorporated 11 I S O 5930 -5: 0 3(E) I CS 35.240.30; 37.1 00.99 Price based on 11 pages © ISO 2003 – All rights reserved