1、BS ISO/IEC24754-1:2008ICS 35.240.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDInformationtechnology Document descriptionand processinglanguages Minimumrequirements forspecifying documentrendering systemsIncorporatingcorrigendumAugust 2011Part 1: Feature spe
2、cifications for documentrendering systemsNational forewordThis British Standard is the UK implementation of ISO/IEC 24754-1:2008, incorporating corrigendum August 2011.The UK participation in its preparation was entrusted to Technical Committee IST/41, Document description and processing language.A
3、list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from le
4、gal obligations.BS ISO/IEC 24754-1:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2008 The British Standards Institution 2012ISBN 978 0 580 76320 5Amendments/corrigenda issued since publicationDate Comments31 January 2012 Imple
5、mentation of ISO/IEC corrigendum August 2011: BS ISO/IEC 24754:2008 renumbered as BS ISO/IEC 24754-1:2008. Subtitle, Foreword, Scope and Annex A corrected to reflect this change.Reference numberISO/IEC 24754:2008(E) ISO/IEC 2008INTERNATIONAL STANDARD ISO/IEC24754-1First edition2008-08-15Information
6、technology Document description and processing languages Minimum requirements for specifying document rendering systems Technologies de linformation Description des documents etsystmes de conversion de documentsPartie 1: Spcifications des caractristiques pour les systmesde conversion de documentslan
7、gages de traitement Exigences minimales pour spcifier les Part 1: Feature specifications for document rendering systemsPDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefa
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12、eb www.iso.org Published in Switzerland ii BS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:2008 (E)iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)form the specialized system for worldwide standardization. National bodies that are m
13、embers of ISO or IECparticipate in the development of International Standards through technical committees established by therespective organization to deal with particular fields of technical activity. ISO and IEC technical committeescollaborate in fields of mutual interest. Other international org
14、anizations, governmental and non- governmental, inliaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC haveestablished a joint technical committee, ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC
15、 Directives, Part 2.The main task of the joint technical committee is to prepare International Standards. Draft International Standardsadopted by the joint technical committee are circulated to national bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of
16、the national 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 and IEC shall not be held responsible for identifying any or all such patent rights.ISO/IEC 2 4754-1 was prepared by Joint Technical Committee I
17、SO/IEC J TC 1 , Information technology,Subcommittee SC 34, Document description and processing languagesISO/IEC 24754 consists of the following parts, under the general title Information technology Document description and processing languages Minimum requirements for specifying document rendering s
18、ystems Part 1: Feature specifications for document rendering systems Part 2: Formatting specifications for document rendering systems BS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:2008 (E)BS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:2008 (E)INTERNATIONAL STANDARD11 ScopeWhen a structured document is interchang
19、ed between an originator and a recipient, the recipient refers to the stylespecifications that the originator provides to reconstruct the presentation. However, when the recipient does nothave sufficient rendering functionality, it may fail to reconstruct the presentation output as the originator ex
20、pected.In order to preserve presentation output in the course of interchange, the originator and recipient need to negotiateover functionalities referring to the specifications of document rendering systems. To satisfy this requirement,provides the minimum requirements for specifying document render
21、ing systems. The can apply to the document processing environment, where a document is given in a logicallystructured format which is expressed by a structure markup language, and the visual representation of the documentis described by means of the external style and layout specifications which a s
22、tyle and layout specificationslanguage provides. The visual representation of the given document is generated when the style and layoutspecifications are applied to the logical structure by a document rendering system.provides an abstract list of the features that a rendering system for an authoredd
23、ocument may have. The list provides a frame of reference, against which the user and implementor can comparethe features of document rendering systems. However, thisinterchange syntax or direct how each document rendering system shall behave.provides the minimum requirements to specify the features
24、that a document renderingsystem which transforms formatting objects to rendering output. It may be used as a frame of reference, againstwhich the user, implementer, or software agent may compare the features of a document rendering system.According to these requirements, the user may express what he
25、 or she expects of a document rendering system,the implementer may describe the functionality and capability of the document rendering system that he or sheimplements, and the software agent may negotiate a minimum set of functionality and capability that are sharedacross different document renderin
26、g system implementations.2 Terms and definitions2.1 document rendering systemsoftware agent which takes in formatted document and generates rendered output2.2 renderingtransforming of a structured document from a certain set of constraints to another set of constraintsNOTE: In most cases, a rendered
27、 document has stronger constraints than a pre-rendering document does.2.3 featurecharacteristic which a document rendering system supports in order to process a document, particularly at timeswhen the document rendering system negotiate the rendering content with physical boundaries, e.g. line break
28、 orpage break, of the output media2.4 paged mediaform of media, which is divided into one or more smaller repetitive areas, each of which has its ownindependent geometric attributesInformation technology Document description and processinglanguages Minimum requirements for specifying documentrenderi
29、ng systemsISO/IEC 24754ISO/IEC 24754part of ISO/IEC 24754 This does ot specify oncrete n a cpart of ISO/IEC 24754 This part of ISO/IEC 24754 BS ISO/IEC 24754-1:2008 Part 1: Feature specifications for document rendering systems ISO/IEC 24754-1:2008 (E)document specification format shall have the same
30、 minimum requirements described here.2geometric part of a page that has static position and can appear at the same position on sequential pages2.6 areaarbitrary part on a page that may have a floating position or be handled as a flowed object2.7 headera set of objects that are positioned at the begi
31、nning of each page of a document, which may include such objectsas page number, title of document, etc.2.8 footerobjects that are positioned at the end of each page of a document, which may include such objects as pagenumber, title of document, etc.2.9 operatora person who interacts with a document
32、or with the document rendering system in order to print or display thedocument3 Features of a document rendering system3.1 General description of a document rendering system3.1.1 Supported output deviceThe output device(s) that the document rendering system supports are described. E.g. printing syst
33、ems andbrowsers.3.1.2 Supported document formatsThe document formats, e.g. XML, RTF, which the document rendering system supports to express the logicalstructure of a given document are described.3.1.3 Supported style languagesThe style specification languages, DSSSL and other style specification la
34、nguages, that the document renderingsystem supports are described.3.1.4 Rendering media dimensionThe dimension of the rendering media, whether it is paged media or non-paged media, is described here. If therendering media is paged, supported page sizes are described, e.g. A4, Letter, Legal.3.1.5 Col
35、our supportThe level of support for colour is described, referring to whether colour is supported by the document renderingsystem, and if colour is supported, what colour profiles are supported. Colour system, e.g. RGB and CMYK, anddepth of colour, e.g. 8-bit (256 colours) and 24-bit (16 million col
36、ours).3.1.6 Dynamic content generationThe support for dynamically-generated content, meaning content calculated by and supplied by the stylesheeteither as fixed value or conditionally-generated based on the presence or absence of data at rendering time.2.5 regionBS ISO/IEC 24754-1:2008 ISO/IEC 24754
37、-1:2008 (E)3Supported coded character standards and encoding schemes are described. E.g. UTF-8, SHIFT_JIS, KS-5601.3.1.8 Composition of combined charactersThe level of support for the composition of combined syllabic characters, whether the document rendering systemsupports the stacking of combined
38、characters and environmental glyph alteration are supported, is described. E.g.Thai, Arabic.3.1.9 Directionality of textSupport for the inherent directions of the progression of text (from left to right, right to left or top to bottom) andlines (from top to bottom, right to left or left to right) is
39、 described.3.1.10 Rendering of white-space charactersThe interpretation of white-space characters, e.g. tab, space, carriage return and line feed, is described. A string ofwhite-space characters may be collapsed or may be interpreted literally. Additionally, white-space characters maybe removed befo
40、re or after line breaks.3.1.11 Font substitutionSupport for font substitution mechanism, e.g. font substitution based on ISO/IEC 9541-1, is described.3.1.12 Font-resource portabilityCapability of embedding and retrieving a font resource is described. If the document rendering system supportsfont-res
41、ource portability, it can extract an embedded font resource from the document and use it for rendering.3.1.13 Embedding of non-standard characters and glyphsSupport for the embedding of non-standard characters and glyphs, e.g. glyphs registered by ISO/IEC 10036, isdescribed.3.2 Description of pagina
42、tion and rendering of page layout3.2.1 Page geometry3.2.1.1 Simple page layoutThe attributes, e.g. page width and height, and margin and padding on top, bottom, left and right, of a page that thedocument rendering system supports are described.3.2.1.2 Columnar paginationThe level of support for colu
43、mnar pagination, i.e. whether columns are supported, and whether the column gap canbe specified, etc. is described.3.2.1.3 Region setting and positioningBasic attributes, e.g. width, height, margin and padding on top, bottom, left and right, and positions in the page, ofthe regions that the document
44、 rendering system can specify are described.3.2.2 Page-geometry sequencingSupport for different types of page-geometry sequencing is described. Example types for page-geometrysequencing are single page ordering, repeatable page ordering, and conditional page ordering. Example types forconditional pa
45、ge ordering are page parity and page position.3.1.7 Supported coded character sets and encoding schemesBS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:2008 (E)43.2.3 Page flowSupport for static content, paginated content and flow maps is described. E.g. document title, page header, pagefooter, sidebars and
46、multiple flows.3.3 Layout independent formattingThis subsection provides a list of features that are independent from the layout of the document.3.3.1 Z-indexSupport for the specification of the z-index depth level of an area is described.3.3.2 Relatively-positioned areasSupport for relatively-posit
47、ioned areas, or floats, for graphics and other objects is described. Treatments availablefor surrounding text are described. E.g. tight, box and arbitrary shape.3.3.3 Absolutely-positioned areasSupport for absolutely-positioned areas for graphics and other objects is described. The available bases f
48、or theabsolute measurements are described. Treatments available for surrounding text are described. E.g. tight, box andarbitrary shape.3.3.4 AnnotationSupport for footnote, endnote and side note, the note body and the reference to the note is described.3.3.5 Cited contentSupport for references to ci
49、ted content that will be replaced at rendering time is described.3.3.6 Dynamic content alterationSupport for content alteration that is triggered by the rendering environment, operator interaction or other conditionsis specified.3.4 TablesThis subsection provides a list of features that relates to the rendering of tables.3.4.1 Table geometrySupported table geometry, e.g. width, height, padding and margin, is described.3.4.2 Table captionSupport for table captions is described.3.4.3 Table headerSupport for the table header and its behaviour is describe
