Table of Contents

Next: , Up: (dir)

The SCSS Manual

This manual describes the SCSS Scheme module.

Copyright © 2011 Julian Graham.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled “GNU Free Documentation License”.



Next: , Previous: Top, Up: Top

1 Introduction

SCSS is an API for parsing and manipulating W3C Cascading Style Sheets in the Scheme programming language. Although the majority of the W3C recommendation is devoted to the proper rendering of documents styled with CSS, SCSS concerns itself only with the formal structure of the style sheet itself – in other words, SCSS doesn't render anything! You can however, combine SCSS with the XML parser of your choice (SCSS integrates particularly well with SDOM: to obtain style information about your XML documents so that they may be rendered correctly.

This document contains a desription of the SCSS API; for general information about Cascading Style Sheets, see the W3C's CSS site (

Next: , Previous: Introduction, Up: Top

2 Data structures

The following data structures are defined by the API and are implemented as R6RS record types.

— scss:cascade:
— scss:make-cascade: user-sheet agent-sheet author-sheet
— scss:cascade?: obj

The scss:cascade type holds the three style sheets that make up the CSS cascade: the user style sheet, the user agent style sheet, and the author style sheet. In SCSS, each of these style sheets is an S-expression (potentially obtained from scss:css->scss) in the format described in See SCSS style sheet representation.

A new scss:cascade instance must be initialized with the three style sheets above; #f may be substituted for style sheets to be omitted from the cascade. Each of user-sheet, agent-sheet, and author-sheet, if specified, should be a valid SCSS style sheet, as determined by scss:stylesheet?.

The contents of the cascade may be manipulated using the following functions.

— Function: scss:set-user-stylesheet! cascade stylesheet

Set stylesheet as the “user” component of cascade. stylesheet and cascade must be a valid style sheet and a valid cascade, as determined by scss:stylesheet? and scss:cascade?, respectively.

— Function: scss:set-author-stylesheet! cascade stylesheet

Set stylesheet as the “author” component of cascade. stylesheet and cascade must be a valid style sheet and a valid cascade, as determined by scss:stylesheet? and scss:cascade?, respectively.

— Function: scss:set-agent-stylesheet! cascade stylesheet

Set stylesheet as the “user agent” component of cascade. stylesheet and cascade must be a valid style sheet and a valid cascade, as determined by scss:stylesheet? and scss:cascade?, respectively.

— scss:document-interface:
— scss:make-document-interface: name-function parent-function prev-sibling-function attribute-function class-function id-function
— scss:document-interface?: obj

The document interface provides a set of functions used for traversing a document tree and extracting information about the nodes it contains. This structure must be initialized with the following arguments.

A name-function, which must be a function of one argument, and which will be passed a node from the document tree. It should return the name of the element as a string.

A parent-function, which must be a function of one argument, and which will be passed a node from the document tree. It should return the node parent if the specified node is not its document's root element, #f otherwise.

A prev-sibling-function, which must be a function of one argument, and which will be passed a node from the document tree. It should return the node's previous sibling if the node is not its document's root element and not its parent's first child, #f otherwise.

An attribute-function, which must be a function of two arguments, and which will be passed a node from the document tree and the name of an attribute as a string. It should return the value of the specified attribute for the specified node if it is present, #f otherwise.

A class-function, which must be a function of one argument, and which will be passed a node from the document tree. It should return as a string the value of the “class” attribute for the specified node in the XML dialect to which the node belongs, or #f if the attribute is not set or cannot be determined.

An id-function, which must be a function of one argument, and which will be passed a node from the document tree. It should return as a string the value of the ID attribute for the node in the XML dialect to which the node belongs, or #f if the attribute is not set or cannot be determined.

Note that a sample instance of scss:document-interface that provides implementations of the functions described above that work well with SDOM is exported by the (scss interface sdom) R6RS library that comes with this version of SCSS.

— scss:rendering-interface:
— scss:make-rendering-interface: pseudo-class-predicate pseudo-element-predicate

The rendering interface wraps functions that provide information to SCSS that cannot be obtained from the document or cascade alone – information that is available to the rendering layer of an application, for example. This structure must be initialized with the following arguments.

A pseudo-class-predicate, which must be a function of two arguments and will be passed a node obtained from the document interface and a string giving the name of a pseudo-class; the function should return #t if the node has the specified pseudo-class, #f otherwise.

The pseudo-class name will be one of the following strings:

A pseudo-element-predicate, which must be a function of two arguments and will be passed a node obtained from the document interface and a string giving the name of a pseudo-element; the function should return #t if the node has an immediate pseudo-element child of the specified type, #f otherwise.

The pseudo-element type will be one of the following strings:

— scss:selection-context:
— scss:make-selection-context: document-interface rendering-interface cascade

A selection context encapsulates the static information that SCSS needs to perform style queries. Instances of scss:selection-context must be initialized with instances of scss:document-interface, scss:rendering-interface, and scss:cascade; their construction is described above.

— scss:selected-value:
— scss:selected-value?: obj
— scss:selected-value-selector: selected-value
— scss:selected-value-property: selected-value
— scss:selected-value-value: selected-value
— scss:selected-value-important?: selected-value

Represents the value obtained from the cascade for a CSS property at a particular document node. This record type provides the following field accessors.

Next: , Previous: Data structures, Up: Top

3 Parsing and emitting style information

— Function: scss:css->scss port
— Function: scss:css->scss port base-url

Reads a complete style sheet from port, verifying that it is well- formed and represents valid style information, and returns a Scheme- language representation of the style sheet. See SCSS style sheet representation. Certain language elements not directly related to style information, such as comments, will be discarded during parsing, and @-rules will be evaluated and the results added to the resulting style sheet.

In particular, @import @-rules will cause SCSS to attempt to import the requested remote style sheet into the one currently being parsed. SCSS understands relative and absolute filesystem paths as well as the “file://” URI scheme. (Use scss:set-uri-import-handler! to handle other URI schemes.) As per the W3C recommendation, relatively- specified paths resolve relative to the location of the importing style sheet. If the base-url parameter is specified, it will be used as a base URI against which to resolve relative paths and URIs during the location of imported style documents.

As part of parsing the style sheet, this function will expand comma- delimited groups of selectors so that each selector refers internally to its own copy of the ruleset. This optimization does not affect style queries, and can be reversed while emitting CSS-formatted style information from an SCSS style sheet.

Throws an error if the root style sheet is either lexically or semantically invalid. Errors in imported style sheets will be ignored.

— Function: scss:set-uri-import-handler! proc

Install the procedure proc as the handler to be called to retrieve data from an @import directive that specifies a URI for the remote style sheet whose protocol is not “file://”. proc should have the following signature:

          (lambda (uri) ...)

...where uri will be a string giving the original URI from the @import directive. proc should return a valid input port from which the requested style information can be read. If proc does not return a valid input port, the @import directive will be ignored and parsing will proceed normally.

— Function: scss:scss->css stylesheet port

Sends a pretty-printed text representation of stylesheet to port. Throws an error if stylesheet is not a valid style sheet as determined by scss:stylesheet?.

Up: Parsing and emitting style information

3.1 SCSS style sheet representation

(Note that it is not necessary to understand the information in this section to use the SCSS API. It is provided for users who curious about how SCSS works or want to construct their own cascades or style sheets from scratch.)

As of version 0.3, SCSS's style sheet representation is based on the format fully described in the documentation of Jim Bender's WebIt! package (, and is outlined in brief below. The S-expr style sheet representations produced by SCSS are wholly compatible with the ones used by WebIt!, provided that only selector types and syntax from the CSS1 recommendation is used. Some (externally incompatible) extensions to this format have been added, in order to support CSS2.1; they are described at the end of this section.

An SCSS style sheet is a list, the head of which is the symbol css, and the tail of which is a list of rules, each of which in turn consists of a head element (a selector) and a tail of property- value lists, each of which can be optionally wrapped in a list whose CAR is !, the importance signifier. The selector may be a symbol, a list of symbols, or a composition of symbols and operators according the rules set forth by the WebIt! specification. Each of the simple selector types defined by the CSS recommendation has a short and an expanded representation in the WebIt! format. The SCSS parser will produce the short form when possible, but will fall back to the long form if an unambiguous short form cannot be produced from the given input. The following table gives the short and expanded forms of the selector types SCSS has in common with WebIt!:

Selector type Short form Expanded form

Descendent path selectors are represented as a list of simple selectors with the symbol // as its head.

Two or more selectors can be grouped by making them into the elements of a list.

The following are extensions to the WebIt! format that have been added to support the selector types and syntax introduced by CSS2.1:

See the WebIt! documentation and the W3 CSS recommendation for more information.

Next: , Previous: Parsing and emitting style information, Up: Top

4 Style predicates

— Function: scss:stylesheet? sheet

Evaluates to #t if and only if sheet is a valid result of parsing a style sheet using scss:css->scss or has been constructed according to the SCSS format specification. See SCSS style sheet representation.

Note that this operation performs a deep inspection of the contents of sheet; consequently, its performance is dependent on the size of its argument.

— Function: scss:inherited? prop-name

Evaluates to #t if and only if prop-name is a symbol giving the name of a property that can be inherited from a parent node in a document tree, #f otherwise.

Next: , Previous: Style predicates, Up: Top

5 Querying the cascade

— Function: scss:select-values selection-context node

Returns a list of scss:selected-value records for properties assigned to the specified document node node by the cascade included in the selection context selection-context. node must be a document node whose representation is compatible with the document interface included in selection-context, which must be an scss:selection-context record constructed as described above.

The returned records may be inspected using the record descriptors described above. See Data structures.

The selector matching process proceeds according to the CSS recommendation – briefly put, matching properties from all matching selectors are retrieved, sorted by importance, then sorted by selector specificity, and then returned.

— Function: scss:get-default-value prop-name

Evaluates to the default value of the CSS property whose name is prop-name, a symbol. If prop-name is not a valid property name, #f will be returned.

— Function: scss:specify property value

Attempts to derive a value for a more specific property property from the value for a more general convenience property, value. property must be a symbol giving the name of a valid CSS2.1 property. The rules for increasing specificity are individual to the property in question. For example, the expression

          (scss:specify 'background-color "background: url(\"chess.png\") gray 50% repeat fixed")

evaluates to the color value “gray”.

Next: , Previous: Querying the cascade, Up: Top

6 Utility functions

The following functions are not directly related to the style cascade but may be useful to developers working with style information.

— Function: scss:color->hex color

Evaluates to a string representation of a hexadecimal number corresponding to the string given by color, if color is one of “maroon,” “red,” “orange,” “yellow,” “olive,” “purple,” “fuschia,” “white,” “lime,” “green,” “navy,” “blue,” “aqua,” “teal,” “black,” “silver,” or “gray;” otherwise, the empty list.

Next: , Previous: Utility functions, Up: Top

Appendix A GNU Free Documentation License

Version 1.2, November 2002
     Copyright © 2000,2001,2002 Free Software Foundation, Inc.
     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

    The purpose of this License is to make a manual, textbook, or other functional and useful document free in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others.

    This License is a kind of “copyleft”, which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software.

    We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. But this License is not limited to software manuals; it can be used for any textual work, regardless of subject matter or whether it is published as a printed book. We recommend this License principally for works whose purpose is instruction or reference.


    This License applies to any manual or other work, in any medium, that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work under the conditions stated herein. The “Document”, below, refers to any such manual or work. Any member of the public is a licensee, and is addressed as “you”. You accept the license if you copy, modify or distribute the work in a way requiring permission under copyright law.

    A “Modified Version” of the Document means any work containing the Document or a portion of it, either copied verbatim, or with modifications and/or translated into another language.

    A “Secondary Section” is a named appendix or a front-matter section of the Document that deals exclusively with the relationship of the publishers or authors of the Document to the Document's overall subject (or to related matters) and contains nothing that could fall directly within that overall subject. (Thus, if the Document is in part a textbook of mathematics, a Secondary Section may not explain any mathematics.) The relationship could be a matter of historical connection with the subject or with related matters, or of legal, commercial, philosophical, ethical or political position regarding them.

    The “Invariant Sections” are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License. If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are none.

    The “Cover Texts” are certain short passages of text that are listed, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the Document is released under this License. A Front-Cover Text may be at most 5 words, and a Back-Cover Text may be at most 25 words.

    A “Transparent” copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, that is suitable for revising the document straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers is not Transparent. An image format is not Transparent if used for any substantial amount of text. A copy that is not “Transparent” is called “Opaque”.

    Examples of suitable formats for Transparent copies include plain ascii without markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML, PostScript or PDF designed for human modification. Examples of transparent image formats include PNG, XCF and JPG. Opaque formats include proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML, PostScript or PDF produced by some word processors for output purposes only.

    The “Title Page” means, for a printed book, the title page itself, plus such following pages as are needed to hold, legibly, the material this License requires to appear in the title page. For works in formats which do not have any title page as such, “Title Page” means the text near the most prominent appearance of the work's title, preceding the beginning of the body of the text.

    A section “Entitled XYZ” means a named subunit of the Document whose title either is precisely XYZ or contains XYZ in parentheses following text that translates XYZ in another language. (Here XYZ stands for a specific section name mentioned below, such as “Acknowledgements”, “Dedications”, “Endorsements”, or “History”.) To “Preserve the Title” of such a section when you modify the Document means that it remains a section “Entitled XYZ” according to this definition.

    The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License.


    You may copy and distribute the Document in any medium, either commercially or noncommercially, provided that this License, the copyright notices, and the license notice saying this License applies to the Document are reproduced in all copies, and that you add no other conditions whatsoever to those of this License. You may not use technical measures to obstruct or control the reading or further copying of the copies you make or distribute. However, you may accept compensation in exchange for copies. If you distribute a large enough number of copies you must also follow the conditions in section 3.

    You may also lend copies, under the same conditions stated above, and you may publicly display copies.


    If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document's license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects.

    If the required texts for either cover are too voluminous to fit legibly, you should put the first ones listed (as many as fit reasonably) on the actual cover, and continue the rest onto adjacent pages.

    If you publish or distribute Opaque copies of the Document numbering more than 100, you must either include a machine-readable Transparent copy along with each Opaque copy, or state in or with each Opaque copy a computer-network location from which the general network-using public has access to download using public-standard network protocols a complete Transparent copy of the Document, free of added material. If you use the latter option, you must take reasonably prudent steps, when you begin distribution of Opaque copies in quantity, to ensure that this Transparent copy will remain thus accessible at the stated location until at least one year after the last time you distribute an Opaque copy (directly or through your agents or retailers) of that edition to the public.

    It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document.


    You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version:

    1. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission.
    2. List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement.
    3. State on the Title page the name of the publisher of the Modified Version, as the publisher.
    4. Preserve all the copyright notices of the Document.
    5. Add an appropriate copyright notice for your modifications adjacent to the other copyright notices.
    6. Include, immediately after the copyright notices, a license notice giving the public permission to use the Modified Version under the terms of this License, in the form shown in the Addendum below.
    7. Preserve in that license notice the full lists of Invariant Sections and required Cover Texts given in the Document's license notice.
    8. Include an unaltered copy of this License.
    9. Preserve the section Entitled “History”, Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled “History” in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence.
    10. Preserve the network location, if any, given in the Document for public access to a Transparent copy of the Document, and likewise the network locations given in the Document for previous versions it was based on. These may be placed in the “History” section. You may omit a network location for a work that was published at least four years before the Document itself, or if the original publisher of the version it refers to gives permission.
    11. For any section Entitled “Acknowledgements” or “Dedications”, Preserve the Title of the section, and preserve in the section all the substance and tone of each of the contributor acknowledgements and/or dedications given therein.
    12. Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles. Section numbers or the equivalent are not considered part of the section titles.
    13. Delete any section Entitled “Endorsements”. Such a section may not be included in the Modified Version.
    14. Do not retitle any existing section to be Entitled “Endorsements” or to conflict in title with any Invariant Section.
    15. Preserve any Warranty Disclaimers.

    If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version's license notice. These titles must be distinct from any other section titles.

    You may add a section Entitled “Endorsements”, provided it contains nothing but endorsements of your Modified Version by various parties—for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard.

    You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one.

    The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version.


    You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers.

    The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work.

    In the combination, you must combine any sections Entitled “History” in the various original documents, forming one section Entitled “History”; likewise combine any sections Entitled “Acknowledgements”, and any sections Entitled “Dedications”. You must delete all sections Entitled “Endorsements.”


    You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects.

    You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document.


    A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an “aggregate” if the copyright resulting from the compilation is not used to limit the legal rights of the compilation's users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document.

    If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document's Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate.


    Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail.

    If a section in the Document is Entitled “Acknowledgements”, “Dedications”, or “History”, the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title.


    You may not copy, modify, sublicense, or distribute the Document except as expressly provided for under this License. Any other attempt to copy, modify, sublicense or distribute the Document is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance.


    The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See

    Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License “or any later version” applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation.

A.0.1 ADDENDUM: How to use this License for your documents

To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page:

       Copyright (C)  year  your name.
       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version 1.2
       or any later version published by the Free Software Foundation;
       with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
       Texts.  A copy of the license is included in the section entitled ``GNU
       Free Documentation License''.

If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the “with...Texts.” line with this:

         with the Invariant Sections being list their titles, with
         the Front-Cover Texts being list, and with the Back-Cover Texts
         being list.

If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation.

If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.

Next: , Previous: GNU Free Documentation License, Up: Top

Procedure index

Previous: Procedure index, Up: Top

Variable index