1、BS ISO/IEC 24754-1:2008 ICS 35.240.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Information technology Document description and processing languages Minimum requirements for specifying document rendering systems Incorporating corrigendum August 2011 Part
2、 1: Feature specifications for documentrendering systemsNational foreword This 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 proce
3、ssing language. A 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 con
4、fer immunity from legal obligations. BS ISO/IEC 24754-1:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2008 The British Standards Institution 2012 ISBN 978 0 580 76320 5 Amendments/corrigenda issued since publication Date Comm
5、ents 31 January 2012 Implementation 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 number ISO/IEC 24754:2008(E) ISO/IEC 2008INTERNATIONAL STANDARD ISO/IEC 24754-1 First
6、 edition 2008-08-15 Information technology Document description and processing languages Minimum requirements for specifying document rendering systems Technologies de linformation Description des documents et systmes de conversion de documents Partie 1: Spcifications des caractristiques pour les sy
7、stmes de conversion de documents langages 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 s
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12、 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii BS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:2008 (E)iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide stand
13、ardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of
14、 mutual interest. Other international organizations, governmental and non- governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in ac
15、cordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International
16、Standard requires approval by at least 75 % of 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
17、4754-1 was prepared by Joint Technical Committee ISO/IEC J TC 1 , Information technology, Subcommittee SC 34, Document description and processing languages ISO/IEC 24754 consists of the following parts, under the general title Information technology Document description and processing languages Mini
18、mum requirements for specifying document rendering systems 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 STAN
19、DARD 1 1 Scope When a structured document is interchanged between an originator and a recipient, the recipient refers to the style specifications that the originator provides to reconstruct the presentation. However, when the recipient does not have sufficient rendering functionality, it may fail to
20、 reconstruct the presentation output as the originator expected. In order to preserve presentation output in the course of interchange, the originator and recipient need to negotiate over functionalities referring to the specifications of document rendering systems. To satisfy this requirement, prov
21、ides the minimum requirements for specifying document rendering systems. The can apply to the document processing environment, where a document is given in a logically structured format which is expressed by a structure markup language, and the visual representation of the document is described by m
22、eans of the external style and layout specifications which a style and layout specifications languageprovides.Thevisualrepresentationofthegivendocumentisgeneratedwhenthestyleand layout specifications are applied to the logical structure by a document rendering system. provides an abstract list of th
23、e features that a rendering system for an authored document may have. The list provides a frame of reference, against which the user and implementor can compare the features of document rendering systems. However, this interchange syntax or direct how each document rendering system shall behave. pro
24、vides the minimum requirements to specify the features that a document rendering system which transforms formatting objects to rendering output. It may be used as a frame of reference, against which the user, implementer, or software agent may compare the features of a document rendering system. Acc
25、ording to these requirements, the user may express what he or she expects of a document rendering system, the implementer may describe the functionality and capability of the document rendering system that he or she implements, and the software agent may negotiate a minimum set of functionality and
26、capability that are shared across different document rendering system implementations. 2 Terms and definitions 2.1 document rendering system software agent which takes in formatted document and generates rendered output 2.2 rendering transforming of a structured document from a certain set of constr
27、aints to another set of constraints NOTE: In most cases, a rendered document has stronger constraints than a pre-rendering document does. 2.3 feature characteristic which a document rendering system supports in order to process a document, particularly at times when the document rendering system neg
28、otiate the rendering content with physical boundaries, e.g. line break or page break, of the output media 2.4 paged media form of media, which is divided into one or more smaller repetitive areas, each of which has its own independent geometric attributes Information technology Document description
29、and processing languages Minimum requirements for specifying document rendering systems ISO/IEC 24754 ISO/IEC 24754 part of ISO/IEC 24754 This does ot specify oncrete n a c part of ISO/IEC 24754 This part of ISO/IEC 24754 BS ISO/IEC 24754-1:2008 Part 1: Feature specifications for document rendering
30、systems ISO/IEC 24754-1:2008 (E) document specification format shall have the same minimum requirements described here.2 geometric part of a page that has static position and can appear at the same position on sequential pages 2.6 area arbitrary part on a page that may have a floating position or be
31、 handled as a flowed object 2.7 header a set of objects that are positioned at the beginning of each page of a document, which may include such objects as page number, title of document, etc. 2.8 footer objects that are positioned at the end of each page of a document, which may include such objects
32、 as page number, title of document, etc. 2.9 operator a person who interacts with a document or with the document rendering system in order to print or display the document 3 Features of a document rendering system 3.1 General description of a document rendering system 3.1.1 Supported output device
33、The output device(s) that the document rendering system supports are described. E.g. printing systems and browsers. 3.1.2 Supported document formats The document formats, e.g. XML, RTF, which the document rendering system supports to express the logical structure of a given document are described. 3
34、.1.3 Supported style languages The style specification languages, DSSSL and other style specification languages, that the document rendering system supports are described. 3.1.4 Rendering media dimension The dimension of the rendering media, whether it is paged media or non-paged media, is described
35、 here. If the rendering media is paged, supported page sizes are described, e.g. A4, Letter, Legal. 3.1.5 Colour support The level of support for colour is described, referring to whether colour is supported by the document rendering system, and if colour is supported, what colour profiles are suppo
36、rted. Colour system, e.g. RGB and CMYK, and depth of colour, e.g. 8-bit (256 colours) and 24-bit (16 million colours). 3.1.6 Dynamic content generation The support for dynamically-generated content, meaning content calculated by and supplied by the stylesheet either as fixed value or conditionally-g
37、enerated based on the presence or absence of data at rendering time. 2.5 region BS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:2008 (E)3 Supported coded character standards and encoding schemes are described. E.g. UTF-8, SHIFT_JIS, KS-5601. 3.1.8 Composition of combined characters The level of support for
38、the composition of combined syllabic characters, whether the document rendering system supports the stacking of combined characters and environmental glyph alteration are supported, is described. E.g. Thai, Arabic. 3.1.9 Directionality of text Support for the inherent directions of the progression o
39、f text (from left to right, right to left or top to bottom) and lines (from top to bottom, right to left or left to right) is described. 3.1.10 Rendering of white-space characters The interpretation of white-space characters, e.g. tab, space, carriage return and line feed, is described. A string of
40、white-space characters may be collapsed or may be interpreted literally. Additionally, white-space characters may be removed before or after line breaks. 3.1.11 Font substitution Support for font substitution mechanism, e.g. font substitution based on ISO/IEC 9541-1, is described. 3.1.12 Font-resour
41、ce portability Capability of embedding and retrieving a font resource is described. If the document rendering system supports font-resource 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 glyphs Support
42、 for the embedding of non-standard characters and glyphs, e.g. glyphs registered by ISO/IEC 10036, is described. 3.2 Description of pagination and rendering of page layout 3.2.1 Page geometry 3.2.1.1 Simple page layout The attributes, e.g. page width and height, and margin and padding on top, bottom
43、, left and right, of a page that the document rendering system supports are described. 3.2.1.2 Columnar pagination The level of support for columnar pagination, i.e. whether columns are supported, and whether the column gap can be specified, etc. is described. 3.2.1.3 Region setting and positioning
44、Basic attributes, e.g. width, height, margin and padding on top, bottom, left and right, and positions in the page, of the regions that the document rendering system can specify are described. 3.2.2 Page-geometry sequencing Support for different types of page-geometry sequencing is described. Exampl
45、e types for page-geometry sequencing are single page ordering, repeatable page ordering, and conditional page ordering. Example types for conditional page ordering are page parity and page position. 3.1.7 Supported coded character sets and encoding schemes BS ISO/IEC 24754-1:2008 ISO/IEC 24754-1:200
46、8 (E)4 3.2.3 Page flow Support for static content, paginated content and flow maps is described. E.g. document title, page header, page footer, sidebars and multiple flows. 3.3 Layout independent formatting This subsection provides a list of features that are independent from the layout of the docum
47、ent. 3.3.1 Z-index Support for the specification of the z-index depth level of an area is described. 3.3.2 Relatively-positioned areas Support for relatively-positioned areas, or floats, for graphics and other objects is described. Treatments available for surrounding text are described. E.g. tight,
48、 box and arbitrary shape. 3.3.3 Absolutely-positioned areas Support for absolutely-positioned areas for graphics and other objects is described. The available bases for the absolute measurements are described. Treatments available for surrounding text are described. E.g. tight, box and arbitrary sha
49、pe. 3.3.4 Annotation Support for footnote, endnote and side note, the note body and the reference to the note is described. 3.3.5 Cited content Support for references to cited content that will be replaced at rendering time is described. 3.3.6 Dynamic content alteration Support for content alteration that is triggered by the rendering environment, operator interaction or other conditions is specified. 3.4 Tables This subsection provides a list of features that relates to the rendering of tables. 3.4.1 Table geometry Supported table geometry, e.g. wid
