The PICS Technical Committee of the World Wide Consortium INTERNET-DRAFT PICS MIT/W3C Expires April 30, 1996 October 30, 1995 Rating Services and Rating Systems Status of this Memo This document is an Internet-Draft. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." To learn the current status of any Internet-Draft, please check the 1id-abstracts.txt listing contained in the Internet-Drafts Shadow Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe), munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or ftp.isi.edu (US West Coast). Distribution of this document is unlimited. 1. Introduction This document, which has been prepared for the technical subcommittee of PICS (Platform for Internet Content Selection), defines: o The meta-language used for the machine-readable description of a rating service. o The methods for locating the machine-readable and human-readable descriptions of rating services and systems. Future documents will specify the syntax and semantics of content labels and protocol(s) for distributing labels. In reading this document it is important to bear in mind that the goal of the PICS effort is to enable a marketplace in which many different products will be developed, tested, and compared. In particular, the following considerations have had significant impact on this document: o Some rating services may provide access to their ratings on-line, from a rating server, while others may either ship them in batches or transmit them on floppy disks or CD-ROMs. PICS/W3C Page 1 Rating Services & Systems 10/30/95 o Some rating systems may be used by more than one group. That is, a set of dimensions may be adequate for the purposes of a number of different organizations. These organizations will then use their own techniques and viewpoints to determine actual ratings. This motivates the distinction between a _rating system_ and a _rating service_ (see the glossary). o Some users of rating services may require more assurance of the validity of a rating than others. There is a trade-off between time, cost, and assurance; this must be left as a market differentiator. 2. What is a "Rating Service"? A _rating service_ is an individual, group, organization, or company that provides content labels for information on the Internet. The labels it provides are based on a _rating system_ (see below). Each rating service must supply a machine-readable description of the its rating service, intended to simplify the job of specifying content selection criteria. This description uses a newly created MIME [1] type, "application/pics". User interface software that constructs filters based on PICS rating services can first load the machine-readable description of the service. This description allows the software to tailor its interface to reflect the details of particular rating service, rather than providing a "one design fits all rating services" interface. A rating service is identified by a URL [2][3], included in the machine-readable description of the service, and used to mark the labels it produces. This URL identifies a human-readable description of the service. The human-readable description is not further specified in this document, but it is recommended that: o it be an HTML [4] document organized for ease of use by novice computer users; o it should provide access to the human-readable description of the rating system used by the service; o it should be available in multiple languages (either through existing negotiation mechanism or through embedded pointers to alternate language versions). This specification does not state how the machine-readable description of a rating service is initially located. For users of the World Wide Web, we expect that in the normal course of events there will be well-known sites that provide lists of rating services along with their human-readable and machine-readable descriptions. PICS/W3C Page 2 Rating Services & Systems 10/30/95 3. What is a "Rating System"? A rating _system_ specifies the dimensions used for labeling, the scale of allowable values on each dimension, and a description of the criteria used in assigning values. (A single rating _system_ may be used by more than one rating _service_ by arrangement between the owner of the system and the owners of the services.) A rating system is identified by a URL. This URL can be accessed to obtain a human-readable description of the rating system. The human-readable description is not further specified in this document, but it is recommended that: o it be an HTML document organized for ease of use by novice computer users; o it should be available in multiple languages (either through existing negotiation mechanism or through embedded pointers to alternate language versions). 4. What is a "Content Label"? A _content label_ (or _rating_) contains information about a document. The information can be supplied with the document or separately. A document may have many ratings, supplied by many different entities. The ratings may be carried in the document, in the HTTP [5] header stream, via a separate on-line rating server, or on a portable medium (CD-ROM or floppy disk). Note specifically that there is no requirement that a rating be obtained via HTTP. A content label (or rating) has three parts: 1. The URL of the rating service 2. A set of PICS-defined (and extensible) attribute-value pairs, which provide information about the rating such as the date that the rating was assigned or the entity doing the rating 3. A set of rating-system-defined attribute-value pairs, which actually rate the item along various _dimensions_ (also called _categories_) The detailed syntax of content labels and protocols for distributing them will appear in a future document. PICS/W3C Page 3 Rating Services & Systems 10/30/95 5. The "application/pics" Document Type A rating service is defined by a document of type application/pics. The detailed syntax and semantics are presented in the next two sections. Here is an example of such a document, intended only to illustrate the full set of features of a machine description: ((PICS-version 1.0) (rating-system "http://www.gcf.org/ratings") (rating-service "http://www.gcf.org/v1.0/") (icon "icons/gcf.gif") (name "The Good Clean Fun Rating System") (description "Everything you ever wanted to know about soap, cleaners, and related products. For demonstration purposes only.") (category (transmit-as "suds") (name "Soapsuds Index") (min 0.0) (max 1.0)) (category (transmit-as "density") (name "suds density") (label (name "none") (value 0) (icon "icons/none.gif")) (label (name "lots") (value 1) (icon "icons/lots.gif"))) (category (transmit-as "subject") (name "document subject") (multivalue true) (label (name "soap") (value 0)) (label (name "water") (value 1)) (label (name "soapdish") (value 2)) (label-only)) (category (transmit-as "color") (name "picture color") (integer) (category (transmit-as "hue") (label (name "blue") (value 0)) (label (name "red") (value 1)) (label (name "green") (value 2))) PICS/W3C Page 4 Rating Services & Systems 10/30/95 (category (transmit-as "intensity") (min 0) (max 255)))) 6. Detailed Syntax of "application/pics" Notes: 1. Whitespace is ignored except in quoted strings. 2. The strings in _transmit-as_ are case insensitive. All other strings are case sensitive. 3. This BNF grammar overly constrains the format. The optional attribute/value pairs in _ratingservicedescription_, _categorylist_ and _enum_ may occur in any order. 4. Additional attributes may be added over time. For experimental purposes, attributes with names beginning "x-" may be added at any time without prior arrangement. Extending the names that are formally part of this specification requires an additional consensus process before adoption. 5. This specification requires the use of UTF-7 [6] encoding to allow for the inclusion of non-English description strings. Because internationalization is an area still under discussion in the standards community, this choice may well be subject to change in the near future. For those rating systems and services that use only the US-ASCII character set in their descriptive strings, UTF-7 allows direct encoding of the following (printable) characters: a-z, A-Z, 0-9, '(),-./:?!#$%&*;<=>@[]^_`{|} Notice that "+" is _not_ included in this set, since it is used by the UTF-7 encoding system. 6. It is guaranteed that this and all future versions of the PICS machine-readable rating service description will begin with the _version_ information, changing from 1.0 as specified here to other numbers as the specification is revised. Rating services are encouraged to place a version number in the _rating-service_ URL, and to change to a new URL when an incompatible change must be made to their specification. PICS/W3C Page 5 Rating Services & Systems 10/30/95 ratingservicedescription :: '(' version ratingsystem ratingservice [icondef] [name] [description] ['(' 'default' [min] [max] [multi] [integer] [labelled] ')'] categorylist ')' version :: '(' 'PICS-version' '1.0' ')' ratingsystem :: '(' 'ratingsystem' quotedURL ')' ratingservice :: '(' 'ratingservice' quotedURL ')' quotedURL :: ' " ' URL ' " ' URL is as defined in RFC-1738 (See [2]). In addition, PICS defines the following new form for referencing Internet Relay Chat (IRC) rooms: URL :: ... | 'irc://' host '/' alphanum (where host is the usual Internet hostname) icondef :: '(' 'icon' quotedURL ')' name :: '(' 'name' quotedstring ')' description :: '(' 'description' quotedstring ')' quotedstring :: ' " ' UTF-7 ' " ' UTF-7 :: Characters encoded using UTF-7, with direct coding of US-ASCII set O except for the double-quote (decimal 34) which must be encoded to allow for its use as the string delimiter character. See note above. categorylist :: [1*n] '(' 'category' '(' 'transmit-as' quotedshortname ')' [icondef] [name] [description] [min] [max] [multi] [integer] [labelled] [enumlist] [categorylist] '}' quotedshortname :: ' " ' [1*n]extendedalphanum ' " ' extendedalphanum :: 'A' | ... | 'Z' | 'a' | ... | 'z' | '+' | '-' min :: '(' 'min' minnum ')' max :: '(' 'max' maxnum ')' minnum :: number | '-INF' maxnum :: number | '+INF' number :: [sign]unsignedint['.' [unsignedint]] sign :: '+' | '-' unsignedint :: [1*n][0-9] multi :: '(' 'multivalue' [boolean] ')' boolean :: 'true' | 'false' integer :: '(' 'integer' [boolean] ')' labelled :: '(' 'label-only' [boolean ] ')' enumlist :: [1*n]enum enum :: '(' 'label' name [description] '(' 'value' number ')' [icondef] ')' PICS/W3C Page 6 Rating Services & Systems 10/30/95 For reference, the following attributes are currently defined by the above BNF: 1. Within a rating service, there are the attributes _category_, _default_, _description_, _icon_, _name_ and _PICS_. 2. Within a category, there are the attributes _description_, _icon_, _integer_, _label_, _label-only_, _max_, _min_, _multivalue_, _name_ and _transmit-as_. 3. Within a named value, there are the attributes _description_, _icon_, _name_ and _value_. 7. Semantics of the "application/pics" Description Recall that the MIME type "application/pics" is intended to describe a particular rating service in sufficient detail to automatically generate a user interface for configuring a content selection filter using that rating service. The _quotedURL_ in the _ratingservice_ refers to the human-readable description of the rating service. This URL is included in all of the labels provided by the rating service. If the optional URL for an icon for the rating service is supplied, it is dereferenced relative to the rating service URL. The _name_ of the rating system is intended to be short and human-readable, with the _description_ being a longer description (suitable, perhaps, for a pop-up box). A complete human-readable description is available from the rating service's URL. The _quotedURL_ in the _ratingsystem_ refers to the human-readable description of the rating system used by this rating service. All URLs in the description, except for the _icon_ in the _ratingservicedescription_, are dereferenced relative to this URL. The rating service's icon is handled specially so that the service can maintain its own (possibly copyrighted) identity even if it chooses to share a rating system with other rating services. The machine-readable description also describes the categories used in the rating system. There may be one or more categories for a given rating system. A single document may have a rating on any or all of these categories. Categories can be nested within one another. A category has a "transmission name" which is used in the actual label for a document. Transmission names should be as short as reasonable. They must be unique within a given rating system (i.e. two categories in the same rating system must _not_ have the same transmission name.) Unlike the name and description strings, transmission names are language-independent. That is, if a rating system is offered in several languages, the transmission names must be the same in all of them. Categories may be nested within one PICS/W3C Page 7 Rating Services & Systems 10/30/95 another (as in the case of "color" in the example rating system). In this case, the transmission name is created in the usual way by starting with the outermost category transmission name, adding a "/" and proceeding inward in the nesting. Thus, the example rating system has three categories, and their transmission names are "color", "color/hue", and "color/intensity." In addition to the transmission name, which is required, a category may optionally have an icon and a human-readable description. Values in PICS labels may be integers or fractions with no greater range or precision than that provided by IEEE single-precision floating point numbers. The machine description for each category can specify restrictions on the range of permissible values for certain named attributes. Values may be restricted to have minimum (_min_ attribute, defaults to "-INF") or maximum (_max_ attribute, defaults to "+INF") values. Values can be restricted to integers by giving the attribute _integer_ the value "true" (the default value is "false" if the attribute is omitted, but "true" if it is present with no value specified). Values may be given names by using the _label_ attribute, and may be restricted to having only these named values by setting the attribute _label-only_ to the value "true" (the default value is "false" if the attribute is omitted, but "true" if it is present with no value specified). When a value is given a name, it may optionally have attached an icon and a human-readable description. Finally, a given category may allow more than a single rating for a given document (consider the dimension "sizes available"); this is indicated by setting the attribute _multivalue_ to "true" (default is "false" if the attribute is omitted, but "true" if it is present with no value specified). For rating systems that contain large numbers of categories or deeply nested categories, it is convenient to allow for inheritance of some attribute values. In particular, the attributes of a category _min_, _max_, _multivalue_, _integer_, and _label-only_ are inherited by a category from its parent. These attributes can be given default values for the entire rating service by using the _default_ attributes. This corresponds to value inheritance in object-oriented systems or lexical scoping in programming languages. Note: While it would be nice to restrict the numeric values of ratings to integers, the following examples motivate our decision to permit fractional values. 1. The MPAA rating system was changed to interpolate a new category (PG-13) between "PG" and "R". Had their system been encoded with a tightly packed integer scale it would have required rescinding many existing labels when the change occurred. With fractional numbers there is no need (in principle, at least) to renumber. PICS/W3C Page 8 Rating Services & Systems 10/30/95 2. It may be desirable to include the cost of an item in a content label. This cost may not be an integral number of currency units (think, for example, of a micropayment system in which charges of small fractions of a cent are permitted). 3. Ratings may be generated by statistical means from the responses of many people. Such ratings could be rounded off to an integer before presentation, but this loses much important information. 8. Explanation of Sample Rating Service Returning to the sample rating service, we see: 1. A full (human-readable) description of the rating system (i.e. the categories and scales) is available from "http://www.gcf.org/ratings". 2. A full (human-readable) description of the rating service which provides the labels is available from "http://www.gcf.org/". The labels themselves will have this URL in them to identify the service that created them. 3. There is an icon associated with the rating service, and it can be retrieved from "http://www.gcf.org/icons/gcf.gif" (formed by interpreting the _icon_ attribute's value relative to the _rating-service_ URL). The short description of the rating service is provided as the value of the _description_ attribute of the rating system, "The Good Clean Fun Rating System". 4. There are four top-level categories in this rating system. The first has a transmission name of "suds" and is described as the "Soapsuds Index". The second has a transmission name of "density" and is described as "suds density", and so on. 5. The "Soapsuds Index" category is rated on a scale from 0.0 to 1.0, inclusive. 6. The "suds density" category can have ratings from -INF to +INF. But there are two values that have names and icons associated with them. The name "none" is the same as 0.0, and the name "lots" is the same as 1.0. These icons are found at "http://www.gcf.org/ratings/icons/none.gif" and "http://www.gcf.org/ratings/icons/lots.gif" (i.e. they are dereferenced relative to the _rating-system_ URL). PICS/W3C Page 9 Rating Services & Systems 10/30/95 7. The "document subject" category only allows the values 0.0, 1.0, and 2.0 to be used, but a single document can have any combination of these values. Each value has a name (0 is "soap", etc.). So one document might not have any rating on this category, while another is both a "soap" and a "soapdish". 8. The "picture color" category has two sub-categories. Values on the "picture color" dimension itself are restricted to integers, and will be transmitted as a category named "color". The first sub-category is transmitted as "color/hue" and the second as "color/intensity". Notice that "color/hue" can take on any integer value (because it inherits the _integer_ attribute its parent, "color", category), but there are three values with names ("blue", "red", and "green"). The category color/intensity can take on any integer value between 0 and 255 (inclusive). 9. Security Considerations Security considerations will be addressed in other documents in this series and in future revisions of this draft. 10. Glossary application/pics A new MIME [1] data type, defined in this document. BNF Backus-Naur Form (or Backus Normal Form). A notation for describing a formal syntax, used extensively in describing programming languages and computer-readable data formats. category The part of a rating system which describes a particular criterion used for rating. For example, a rating system might have three categories named "sexual material", "violence", and "vocabulary". Also called a "dimension". content label A data structure containing information about a given document's contents. Also called a "rating" or "content rating". The content label may accompany the document it is about or be available separately. content rating See "content label". dimension See "category". HTML HyperText Markup Language [4]. A means of representing "hypertext" documents. Based on SGML. PICS/W3C Page 10 Rating Services & Systems 10/30/95 HTTP HyperText Transfer Protocol [5]. Used for retrieving document contents and/or descriptive header information. hypertext Text, graphics, and other media connected through links. MIME Multimedia Internet Message Extension [1]. A technique for sending arbitrary data through electronic mail on the Internet. PICS Platform for Internet Content Selection, the name for both the suite of specification documents of which this is a part, and for the organization writing the documents. For more information, see "http://www.w3.org/PICS". rating See "content label". rating server A computer system which supplies, via a computer network, ratings of documents. It may or may not provide the documents themselves. rating service An individual or organization that assigns labels according to some rating system, and then distributes them, perhaps via a rating server or via CD-ROM. rating system A method for rating information. A rating system consists of one or more "categories". scale The range of permissible values for a category. SGML Standard Generalized Markup Language. transmission name (of a "category") The short name intended for use over a network to refer to the category. This is distinct from the category name in as much as the transmission name must be language-independent, encoded in ASCII, and as short as reasonably possible. Within a single "rating system" the transmission names of all categories must be distinct. URL Uniform Resource Locator [2][3]. A URL describes the location and means of retrieval for a single document. It consists of three components: the "scheme" (protocol used to retrieve a document, like "http" or "ftp"), a host name, and a hierarchical document name within that host. For example "http://www.w3.org/PICS" is the URL of the PICS home page. The scheme for retrieving it is "http", the host is "www.w3.org" and the name within that host is "PICS". UTF-7 An encoding technique that can be used to transmit Unicode over 7-bit ASCII transport systems such as Internet electronic mail. PICS/W3C Page 11 Rating Services & Systems 10/30/95 11. References [1] N. Borenstein, N. Freed, "MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies", RFC 1521, 09/23/1993. [2] T. Berners-Lee, L. Masinter, M. McCahill, "Uniform Resource Locators (URLs)", RFC 1738, 12/20/94. [3] R. Fielding, "Relative Uniform Resource Locators", RFC 1808, 6/14/95. [4] T. Berners-Lee, D. Connolly, "Hypertext Markup Language - 2.0", RFC 1866, 11/03/1995. [5] "Hypertext Transfer Protocol -- HTTP/1.0", a work in progress of the HTTP working group of the IETF, 10/16/1995, file name: [6] D. Goldsmith, M. Davis, "UTF-7 - A Mail-Safe Transformation Format of Unicode", RFC 1642, 7/13/94. 12. Author's Addresses More information about PICS can be found at http://www.w3.org/PICS The three primary authors of this document are: Jim Miller (co-chair, Technical Committee) World Wide Web Consortium MIT/LCS 545 Technology Square Cambridge, MA 02139 Phone: 617-253-3194 EMail: jmiller@w3.org Paul Resnick (co-chair, Technical Committee) AT&T Bell Laboratories Room 2C-430B 600 Mountain Ave. P. O. Box 636 Murry Hill, NJ 07974-0636 Phone: 908-582-5370 FAX: 908-582-4113 EMail: presnick@research.att.com David Singer International Business Machines Corporation Almaden Research Center 650 Harry Road San Jose, CA 95120-6099 Phone: 408-927-2509 FAX: 408-927-4073 EMail: singer@almaden.ibm.com Rich Petke from CompuServe formatted the document as an Internet Draft. Other contributors included: Brenda Baker, AT&T Tim Berners-Lee, W3C Roxana Bradescu, AT&T Daniel W. Connolly, W3C Roy Fielding, W3C Jay Friedland, SurfWatch Wayne Gramlich, Sun Woodson Hobbs, NewView Rohit Khare, W3C Charlie Kim, Apple John C. Klensin, MCI Tim Krauskopf, Spyglass Ann McCurdy, Microsoft Dave Raggett, W3C Bob Schloss, IBM Ray Soular, SafeSurf Jason Thomas, MIT G. Winfield Treese, OpenMarket Richard Wolpert, Providence Systems PICS/W3C Page 12 Rating Services & Systems 10/30/95 Appendix A: Good Clean Fun Rating Service One of the simplest possible rating systems uses a single category, "Minimum recommended age." We present the machine description for a fictional service that uses this rating system. ((PICS-version 1.0) (rating-system "http://www.gcf.org/our-system/") (rating-service "http://www.gcf.org/our-service/v1.0/") (name "The Good Clean Fun Rating Service") (description "We estimate the maturity required to view materials on the Internet.") (category (name "Minimum Age") (transmit-as "age") (integer true))) Appendix B: RSAC Rating Service As a specific example of a deployed rating service, encoded using the PICS machine-readable description format, we present the service supplied by the Recreational Software Advisory Council (RSAC). They use their own (copyrighted) rating system, which we include with their permission. The rating system contains three categories: Violence, Nudity/Sex, and Language. Each category is rated on a scale from 0 to 4, with a specific description for each value. Intermediate values are not permitted. The URLs presented here are fictitious, but represent reasonable choices should RSAC choose to deploy their system on-line. ((PICS-version 1.0) (rating-system "http://www.rsac.org/Ratings/Description/") (rating-service "http://www.rsac.org/v1.0") (icon "icons/rsac.gif") (name "The RSAC Ratings Service") (description "The Recreational Software Advisory Council rating service. Based on the work of Dr. Donald F. Roberts of Stanford University, who has studied the effects of media on children for nearly 20 years.") (default (label-only true)) (category (transmit-as "v") (name "Violence") (icon "icons/violence.gif") (label (name "Conflict") (description "Harmless conflict; some damage to objects") (value 0) (icon "icons/zero.gif")) (label (name "Fighting") (description "Creatures injured or killed; damage to objects; fighting") (value 1) (icon "icons/one.gif")) PICS/W3C Page 13 Rating Services & Systems 10/30/95 (label (name "Killing") (description "Humans injured or killed with small amount of blood") (value 2) (icon "icons/two.gif")) (label (name "Blood and Gore") (description "Humans injured or killed; blood and gore") (value 3) (icon "icons/three.gif")) (label (name "Wanton Violence") (description "Wanton and gratuitous violence; torture; rape") (value 4) (icon "icons/four.gif"))) (category (transmit-as "s") (name "Nudity/Sex") (icon "icons/sex.gif") (label (name "None") (description "No nudity or revealing attire / Romance; no sex") (value 0) (icon "icons/zero.gif")) (label (name "Revealing Attire") (description "Revealing attire / Passionate kissing") (value 1) (icon "icons/one.gif")) (label (name "Partial Nudity") (description "Partial nudity / Clothed sexual touching") (value 2) (icon "icons/two.gif")) (label (name "Frontal Nudity") (description "Non-sexual frontal nudity / Non-explicit sexual activity") (value 3) (icon "icons/three.gif")) (label (name "Explicit") (description "Provocative frontal nudity / Explicit sexual activity; sex crimes") (value 4) (icon "icons/four.gif"))) (category (transmit-as "l") (description "Language") (icon "icons/language.gif") (label (name "Slang") (description "Inoffensive slang; no profanity") (value 0) (icon "icons/zero.gif")) (label (name "Mild Expletives") (description "Mild expletives") (value 1) (icon "icons/one.gif")) PICS/W3C Page 14 Rating Services & Systems 10/30/95 (label (name "Expletives") (description "Expletives; non-sexual anatomical references") (value 2) (icon "icons/two.gif")) (label (name "Obscene Gestures") (description "Strong, vulgar language; obscene gestures") (value 3) (icon "icons/three.gif")) (label (name "Explicit") (description "Crude or explicit sexual references") (value 4) (icon "icons/four.gif")))) Appendix C: SafeSurf Rating Service SafeSurf, a parents' organization, has established a rating system that is in use at a large and growing number of sites on the Internet. They have provided a machine-readable version of their system to PICS as a demonstration of a more complex rating system that includes sub-categories as well as a document classification system. The following specification includes a full description of the rating part of the SafeSurf system, with only a small stub to represent the classifications. ((PICS-version 1.0) (rating-system "http://www.safesurf.com/ratings/description/") (rating-service "http://www.safesurf.com/v1.0/") (icon "icons/ss~~.gif") (name "SafeSurf Parents' Organization") (description "The SafeSurf SS~~ Rating Standard. Designed by and for parents to empower each family to make informed decisions concerning accessibility of online content. Copyright 1995. All Rights Reserved.") (category (transmit-as "Adult") (name "Adult Themes with Caution Levels") (category (name "Age Range") (transmit-as "0") (label (value 1) (name "All Ages")) (label (value 2) (name "Older Children")) (label (value 3) (name "Teens")) (label (value 4) (name "Older Teens")) (label (value 5) (name "Adult Supervision Recommended")) (label (value 6) (name "Adults")) (label (value 7) (name "Limited to Adults")) (label (value 8) (name "Adults Only")) (label (value 9) (name "Explicitly for Adults"))) (category (name "Profanity") (transmit-as "1") (label (value 1) (name "Subtle Innuendo") (description "Subtly Implied through the use of Slang")) (label (value 2) (name "Explicit Innuendo") (description "Explicitly implied through the use of Slang")) PICS/W3C Page 15 Rating Services & Systems 10/30/95 (label (value 3) (name "Technical Reference") (description "Dictionary, encyclopedic, news, technical references")) (label (value 4) (name "Non-Graphic-Artistic") (description "Limited non-sexual expletives used in a artistic fashion")) (label (value 5) (name "Graphic-Artistic") (description "Non-sexual expletives used in a artistic fashion")) (label (value 6) (name "Graphic") (description "Limited use of expletives and obscene gestures")) (label (value 7) (name "Detailed Graphic") (description "Casual use of expletives and obscene gestures")) (label (value 8) (name "Explicit Vulgarity") (description "Heavy use of vulgar language and obscene gestures")) (label (value 9) (name "Explicit and Crude") (description "Saturated with crude sexual references and gestures"))) (category (name "Heterosexual Themes") (transmit-as "2") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Explicit Vulgarity")) (label (value 9) (name "Explicit and Crude"))) (category (name "Homosexual Themes") (transmit-as "3") (label (name "Subtle Innuendo") (value 1)) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference") (description "Dictionary, encyclopedic, news, medical references")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Inviting Adult Participation")) (label (value 9) (name "Explicitly Inviting Adult Participation"))) PICS/W3C Page 16 Rating Services & Systems 10/30/95 (category (name "Nudity") (transmit-as "4") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Explicit Vulgarity")) (label (value 9) (name "Explicit and Crude"))) (category (name "Violence") (transmit-as "5") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Inviting Participation in Graphic Interactive Format")) (label (value 9) (name "Encouraging Personal Participation, Weapon Making"))) (category (name "Sex Violence and Profanity") (transmit-as "6") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Explicit Vulgarity")) (label (value 9) (name "Explicit and Crude"))) (category (name "Bigotry") (transmit-as "7") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Literary")) (label (value 5) (name "Graphic-Literary")) (label (value 6) (name "Graphic Discussions")) (label (value 7) (name "Endorsing Hatred")) (label (value 8) (name "Endorsing Violent or Hateful Action")) (label (value 9) (name "Advocating Violent or Hateful Action"))) PICS/W3C Page 17 Rating Services & Systems 10/30/95 (category (name "Glorifying Drug Use") (transmit-as "8") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Simulated Interactive Participation")) (label (value 9) (name "Soliciting Personal Participation"))) (category (name "Other Adult Themes") (transmit-as "9") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Reference")) (label (value 4) (name "Non-Graphic-Artistic")) (label (value 5) (name "Graphic-Artistic")) (label (value 6) (name "Graphic")) (label (value 7) (name "Detailed Graphic")) (label (value 8) (name "Explicit Vulgarity")) (label (value 9) (name "Explicit and Crude"))) (category (name "Gambling") (transmit-as "A") (label (value 1) (name "Subtle Innuendo")) (label (value 2) (name "Explicit Innuendo")) (label (value 3) (name "Technical Discussion")) (label (value 4) (name "Non-Graphic-Artistic, Advertising")) (label (value 5) (name "Graphic-Artistic, Advertising")) (label (value 6) (name "Simulated Gambling")) (label (value 7) (name "Real Life Gambling without Stakes")) (label (value 8) (name "Encouraging Interactive Real Life Participation with Stakes")) (label (value 9) (name "Providing Means with Stakes")))) (category (name "Classification with Percentage") (transmit-as "Class") (min 1) (max 100) (integer true) (category (transmit-as "00") (name "General Information")))) PICS/W3C Page 18