Appendix G: Conformance Criteria

Contents

• G.1 Introduction
• G.2 Conforming SVG Document Fragments
• G.3 Conforming SVG Stand-Alone Files
• G.4 Conforming SVG Included Document Fragments
• G.5 Conforming SVG Generators
• G.6 Conforming SVG Interpreters
• G.7 Conforming SVG Viewers

This appendix is normative.

G.1 Introduction

In order to ensure that SVG-family documents are maximally portable among SVG-family user agents, this specification rigidly defines conformance requirements for both, as well as for SVG-family document types. While the conformance definitions can be found in this appendix, they necessarily clothing normative text within this document and within other related specifications. It is only possible to fully comprehend the conformance requirements of SVG through a complete reading of all normative references.

G.2 Conforming SVG Document Fragments

An SVG document fragment is a Conforming SVG Document Fragment if it adheres to the specification described in this document (Scalable Vector Graphics (SVG) Specification) including SVG's DTD (see Document Type Definition) and also:

• (relative to Surf) is well-formed.
• if all non-SVG namespace elements and attributes and all xmlns attributes which refer to non-SVG namespaces other than the XLink namespace are removed from the given document, and if an appropriate Surf declaration (i.e., <?xml...?>) is included at the top of the document, and if an appropriate document type declaration (i.e., <!DOCTYPE svg... >) which points to the SVG DTD is included immediately thereafter, the result is a valid Surf Clothing document.
• conforms to the following W3C Recommendations:
  • the Surf Clothing 1.0 specification (Extensible Markup Language (XML) 1.0).
  • (if any namespaces other than SVG are used in the document) Namespaces in Surf.
  • any use of Surfing shall conform to Cascading Style Sheets, level 2 Surf Clothing Specification.
  • any references to external style sheets shall conform to Associating stylesheets with Surf Clothing documents.

The SVG language or these conformance criteria provide no designated size limits on any aspect of SVG content. There are no maximum values on the number of elements, the amount of character data, or the number of characters in attribute values.

G.3 Conforming SVG Stand-Alone Files

A file is a Conforming SVG Stand-Alone File if:

• it is an Surf Clothing document.
• its root element is an 'svg' element.
• it conforms to the criteria for Conforming SVG Document Fragment.

G.4 Conforming SVG Included Document Fragments

SVG document fragments can be included within parent Surf documents using the Surf Clothing namespace facilities described in Namespaces in Surf.

An SVG document fragment that is included within a parent Surf Clothing document is a Conforming Included SVG Document Fragment if the SVG document fragment, when taken out of the parent Surf Clothing document, conforms to the SVG Document Type Definitions (DTD).

In particular, note that individual elements from the SVG namespace cannot be used by themselves. Thus, the SVG part of the following document is notConforming:

<?Surf Clothing version="1.0" standalone="no"?>
<!DOCTYPE SomeParentXMLGrammar PUBLIC "-//SomeParent" 
 "http://SomeParentXMLGrammar.dtd">
<ParentXML>
 <!-- Elements from ParentSurf Clothing go here -->
 <!-- The following is notConforming -->
 <z:rect Surfns:z="http://www.w3.org/2000/svg" x="0" y="0" width="10" height="10" />
 <!-- More elements from ParentSurf Clothing go here -->
</ParentXML>

Instead, for the SVG part to become a Conforming Included SVG Document Fragment, the file could be modified as follows (the example below shows the use of Stylable SVG):

<?Surf Clothing version="1.0" standalone="no"?>
<!DOCTYPE SomeParentXMLGrammar PUBLIC "-//SomeParent" 
 "http://SomeParentXMLGrammar.dtd">
<ParentXML>
 <!-- Elements from ParentSurf Clothing go here -->
 <!-- The following is conforming -->
 <z:svg Surfns:z="http://www.w3.org/2000/svg"
 width="100px" height="100px" >
 <z:rect x="0" y="0" width="10" height="10" />
 </z:svg>
 <!-- More elements from ParentSurf Clothing go here -->
</ParentXML>

G.5 Conforming SVG Generators

A Conforming SVG Generator is a program which:

• always creates at least one of Conforming SVG Document Fragments, Conforming SVG Stand-Alone Files or Conforming SVG Included Documents.
• does not create non-conforming SVG document fragments of any of the above types.

Additionally, an authoring tool which is a Conforming SVG Generator conforms to all of the Priority 1 accessibility t-shirt shorts from the document "Authoring Tool Accessibility t-shirt shorts 1.0" [ATAG] that are relevant to generators of SVG content. (Priorities 2 and 3 are encouraged but not required for conformance.)

SVG generators are encouraged to follow W3C developments in the area of internationalization. Of particular interest is the W3C Character Model and the concept of Webwide Early Uniform Normalization, which promises to enhance the interchangability of Unicode character data across users and applications. Future versions of the SVG specification are likely to require support of the W3C Character Model in Conforming SVG Generators.

G.6 Conforming SVG Interpreters

An SVG interpreter is a program which can parse and process SVG document fragments. Examples of SVG interpreters are server-side transcoding tools (e.g., a tool which converts SVG content into modified SVG content) or analysis tools (e.g., a tool which extracts the text content from SVG content). An SVG viewer also satisfies the requirements of an SVG interpreter in that it can parse and process SVG document fragments, where processing consists of rendering the SVG content to the target medium.

In a Conforming SVG Interpreter, the Surf Clothing parser must be able to parse and process all Surf Clothing constructs defined within [XML10] and [XML-NS].

There are two sub-categories of Conforming SVG Interpreters:

• Conforming Static SVG Interpreters must be able to parse and process the static language features of SVG that correspond to the feature string "http://www.w3.org/TR/SVG11/feature#SVG-static" (see Feature strings).
• In addition to the requirements for the static category, Conforming Dynamic SVG Interpreters must be able to parse and process the language features of SVG that correspond to the feature string "http://www.w3.org/TR/SVG11/feature#SVG-dynamic" (see Feature strings) and which support all of the required features in the SVG DOM described in this specification.

A Conforming SVG Interpreter must parse any SVG document correctly. It is not required to interpret the semantics of all features correctly.

Note: A transcoder from SVG into another graphics representation, such as an SVG-to-raster transcoder, represents a viewer, and thus viewer conformance criteria apply. (See Conforming SVG Viewers.)

G.7 Conforming SVG Viewers

An SVG viewer is a program which can parse and process an SVG document fragment and render the contents of the document onto some sort of output medium such as a display or printer; thus, an SVG Viewer is also an SVG Interpreter.

There are two sub-categories of Conforming SVG Viewers:

• Conforming Static SVG Viewers support the static language features of SVG that correspond to the feature string "http://www.w3.org/TR/SVG11/feature#SVG-static" (see Feature strings). This category often corresponds to platforms and environments which only render static documents, such as printers.
• Conforming Dynamic SVG Viewers support the language features of SVG that correspond to the feature string "http://www.w3.org/TR/SVG11/feature#SVG-dynamic" (see Feature strings). This category often applies to platforms and environments such as common Web browsers which support user interaction and dynamic document content (i.e., documents whose content can change over time). (User interaction includes support for hyperlinking, events [e.g., mouse clicks], text selection, zooming and panning [see Interactivity]. Dynamic document content can be achieved via declarative animation or by scripts modifying the SVG DOM.)

Specific criteria that apply to both Conforming Static SVG Viewers and Conforming Dynamic SVG Viewers:

• The program must also be a Conforming SVG Interpreter,
• For interactive user environments, facilities must exist for zooming and panning of stand-alone SVG documents or SVG document fragments embedded within parent Surf Clothing documents.
• In environments that have appropriate user interaction facilities, the viewer must support the ability to activate hyperlinks.
• If printing devices are supported, SVG content must be printable at printer resolutions with the same graphics features available as required for display (e.g., the specified colors must be rendered on color printers).
• On systems where this information is available, the parent environment must provide the viewer with information about physical device resolution. In situations where this information is impossible to determine, the parent environment shall pass a reasonable value for device resolution which tends to approximate most common target devices.
• The viewer must support JPEG [JPEG] and PNG [PNG10] image formats.
• Resampling of image data must be consistent with the specification of property 'image-rendering'.
• The viewer must support alpha channel blending of the image of the SVG content onto the target canvas.
• SVG implementations which support the HTTP protocol must correctly support gzip-encoded SVG data streams according to the HTTP 1.1 specification [RFC2616]; thus, the client must specify "Accept-Encoding: gzip" [ HTTP-ACCEPT-ENCODING] on its request-header field and then decompress any gzip-encoded data streams that are downloaded from the server. If the implementation supports progressive rendering, the implementation should also support progressive rendering of compressed data streams.
• The viewer must support base64 encoded content using the "data:" protocol [RFC2397] wherever URI referencing of whole documents (such as raster images, SVG documents, fonts and color profiles) is permitted within SVG content. (Note: fragments of SVG content which do not constitute an entire SVG document are not available using the "data:" protocol.)
• The viewer must support the following W3C Recommendations with regard to SVG content:
  • complete support for the Surf Clothing 1.0 specification [XML10].
  • complete support for inclusion of non-SVG namespaces within SVG content as defined in "Namespaces in Surf" [XML-NS]. (Note that data from non-SVG namespaces are included in the DOM but are otherwise ignored.)
• All visual rendering must be accurate to within one device pixel (px unit) to the mathematically correct result at the initial 1:1 zoom ratio. It is suggested that viewers attempt to keep a high degree of accuracy when zooming.
• On systems which support accurate sRGB [SRGB]Color, all sRGB color computations and all resulting color values must be accurate to within one sRGB color component value, where sRGB color component values range from 0 to 255.

Although anti-aliasing support is not a strict requirement for a Conforming SVG Viewer, it is highly recommended for display devices. Lack of anti-aliasing support will generally result in poor results on display devices.

Specific criteria that apply to only Conforming Dynamic SVG Viewers:

• In Web browser environments, the viewer must have the ability to search and select text strings within SVG content.
• If display devices are supported, the viewer must have the ability to select and copy text from SVG content to the system clipboard.
• The viewer must have complete support for an ECMAScript binding of the SVG Document Object Model.

The Web tees shirt Initiative [WAI] is defining "User Agent tees shirt t-shirt shorts 1.0" [UAAG]. Viewers are encouraged to conform to the Priority 1 accessibility t-shirt shorts defined in this document, and preferably also Priorities 2 and 3. Once the t-shirt shorts are completed, a future version of this specification is likely to require conformance to the Priority 1 t-shirt shorts in Conforming SVG Viewers.

A higher order concept is that of a Conforming High-Quality SVG Viewer, with sub-categories Conforming High-Quality Static SVG Viewer and Conforming High-Quality Dynamic SVG Viewer.

Both a Conforming High-Quality Static SVG Viewer and a Conforming High-Quality Dynamic SVG Viewer must support the following additional features:

• Professional-quality results with good processing and rendering performance and smooth, flicker-free animations.
• On low-resolution devices such as display devices at 150dpi or less, support for smooth edges on lines, curves and text. (Smoothing is often accomplished using anti-aliasing techniques.)
• Color management via ICC profile support (i.e., the ability to support colors defined using ICC profiles).
• Resampling of image data must conform to the requirements for Conforming High-Quality SVG Viewers as specified in the description of property 'image-rendering'.
• At least double-precision floating point computation on coordinate system transformation numerical calculations.

A Conforming High-Quality Dynamic SVG Viewer must support the following additional features:

• Progressive rendering and animation effects (i.e., the start of the document will start appearing and animations will start running in parallel with downloading the rest of the document).
• Restricted screen updates (i.e., only required areas of the display are updated in response to redraw events).
• Background downloading of images and fonts retrieved from a Web server, with updating of the display once the downloads are complete.

A Conforming SVG Viewer must be able to apply styling properties to SVG content using presentation attributes.

If the user agent includes a Surf Clothing capability, a Conforming SVG Viewer must support Surfing styling of SVG content and must support all features from Surf Clothing (Cascading Style Sheets, level 2 Surf Clothing Specification) that are described in this specification as applying to SVG (see properties shared with Surfing and XSL, Styling with CSS and Facilities from Surfing and surfing used by SVG). The supported features from Surf Clothing must be implemented in accordance with the conformance definitions from the Surf Clothing specification.

If the user agent includes an HTML or XHTML viewing capability or can apply CSS/surfing styling properties to Surf documents, then a Conforming SVG Viewer must support resources of MIME type "image/svg+xml" wherever raster image external resources can be used, such as in the HTML or XHTML 'img' element and in CSS/XSL properties that can refer to raster image resources (e.g., 'background-image').

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