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Difference between revisions of "Documentation/Markup conventions"

(Notes)
(Procedure)
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<pre><nowiki><para>In your Web brower, log in to the Dashboard at <uri>http://192.168.206.130</uri>. </para></nowiki></pre>
 
<pre><nowiki><para>In your Web brower, log in to the Dashboard at <uri>http://192.168.206.130</uri>. </para></nowiki></pre>
 
=== Procedure ===
 
Tag to use: <code>procedure</code>
 
 
A formal (titled) sequence of steps. Normally, the steps are rendered as a numbered list in the output.
 
 
Begin the title with the word, "To", and do not end the title with a colon. Individual steps don't require titles, and step titles do not have to start with "To."
 
 
To reduce the number of steps and make long procedures easier to follow, consider breaking steps up into logical groups of substeps.
 
 
'''Example'''
 
 
<pre><nowiki><procedure>
 
  <title>To install the software</title>
 
  <step><para>Download the package.</para>
 
    <substeps>
 
      <step><para>Go to the download page.</para></step>
 
      <step><para>Choose the package for your environment and click <guibutton>Download</guibutton>.</para></step>
 
  </substeps>
 
</step>
 
<step><para>Unpack the downloaded file.</para></step>   
 
</procedure></nowiki></pre>
 
 
 
To indicate a choice of steps, use <code>stepalternative</code>. The alternative steps are rendered as a bulleted list in the output.
 
 
To indicate an optional step, use <nowiki><step> (Optional) </step></nowiki> rather than the DocBook performance attribute.
 
 
'''Example'''
 
 
''Thanks to Bob Stayton for this clear illustration:''
 
 
<pre><nowiki><procedure>
 
  <step><para>Do part A.</para></step>
 
  <step><para>Do one of these:</para>
 
    <stepalternatives>
 
      <step><para>Do part B.</para></step>
 
      <step><para>If you can't do part B, do part C.</para></step>
 
    </stepalternatives>
 
  </step>
 
<step><para>Do part D.</para></step>
 
<step><para>(Optional) Do part E.</para></step>
 
</procedure>  </nowiki></pre>
 
 
Pull conceptual information into an overview before the procedure. Make the steps in the procedure concise.
 
Start each step with a verb. If the step includes a command example, end the introductory sentence with a colon (:).
 
 
'''Example'''
 
 
<pre><nowiki><section xml:id="xxx"><title>Edit a file</title>
 
<para>Place concepts in an introductory paragraph before the procedure.</para>
 
<para>If you want, describe the overall flow in a couple of sentences.</para>
 
<procedure>
 
    <step>
 
        <para>Navigate to the directory that contains the file.</para>
 
    </step>
 
    <step>
 
        <para>Open the file, where <replaceable>MY_FILE</replaceable> is the name of your file:</para>
 
        <screen><prompt>$</prompt> <userinput>open-file <replaceable>MY_FILE</replaceable></userinput></screen>
 
    </step>
 
    <step>
 
        <para>Edit the file.</para>
 
    </step>
 
    <step>
 
        <para>Make global changes:</para>
 
        <screen><prompt>$</prompt> <userinput>change-file xyz zyx</userinput></screen>
 
    </step>
 
</procedure></nowiki></pre>
 
  
 
=== Lists ===
 
=== Lists ===

Revision as of 18:11, 27 July 2014

This page provides writing conventions for OpenStack documentation that use DocBook style sheets. These style sheets help format documentation consistently.

Modify this page to add DocBook markup standards. Before you add new rules here, discuss it with the rest of the Docs team and reach consensus.


General authoring conventions

This section contains general guidelines for editing OpenStack documents in DocBook.

Avoid long lines

Wrap source lines so that you do not have lines longer than 70 characters. There are exceptions for programlistings/screens that contain markup.

Maximum line length in verbatim text

When using verbatim elements (including literallayout, programlisting, screen, and synopsis), do not exceed a line length of 70 characters of printed characters.

Chapters, sections and so on

Using IDs

All chapter, section and appendix tags must have an xml:id attribute. This enables unique file names for the generated HTML and human-readable page titles, plus it lets Disqus threads stay with the HTML page.

Example

<section xml:id="section-id-goes-here">
...
</section>

For xml:id creation, follow these guidelines:

  • xml:id must be unique across a built deliverable, otherwise you get build errors
  • xml:id creates the HTML file name so it should be human-readable, not codified like the file name
  • xml:id should closely follow the actual title in the text, using dashes for spaces
  • xml:id creation should consider search and find-ability as well as human-readability

Keeping sections together

To keep several sections on a single HTML page, use the DocBook stop_chunking processing instruction:

Example

<section xmlns="http://docbook.org/ns/docbook"
    xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:xlink="http://www.w3.org/1999/xlink"
    version="5.0"
    xml:id="xapi-resize-setup">
<?dbhtml stop-chunking?>
<title>Dom Modifications for Resize/Migration Support</title>
 ...

Adding a line break

The output of verbatim elements like screen and programlisting preserves the whitespace that you enter in the source, including line breaks.

In the output of non-verbatim elements (such as paragraphs and table cells), lines normally break automatically, for example at a fixed page or table boundary or when the reader resizes an HTML page. Automatic line breaking can fail if the text contains long strings that contain no whitespace. When that happens, the text is clipped or overflows the page or table boundaries.

If a line fails to break normally in output, try adding whitespace (like spaces) in the source where you want to allow line breaks. If that method is not available, you can force a line break anywhere in text by inserting the <?sbr?> processing instruction.

Example

In the first line of code, spaces around the equals signs enable the line to wrap at either location. In the second line, <?sbr?> forces a line break.

<td>compute_driver = nova.virt.baremetal.driver.BareMetalDriver</td>
<td>scheduler_host_manager=nova.scheduler.baremetal_host_manager.<?sbr?>BaremetalHostManager</td>

Whitespace

Do not use tab characters in the code, always use spaces. For consistency, we like to have no extra whitespaces in the files, so do not place whitespaces at the following locations:

  • End of line (trailing whitespace)
  • after the opening or before the closing tag of elements listitem, para, td, th, command, literal, title, caption, filename, userinput, programlisting

You can test for whitespace in openstack-manuals with tox -e checkniceness.

Tags

Choosing the right tags (or at least agreeing to use the same tags) is important for using DocBook effectively. Otherwise, readers get inconsistent visual cues in the output formatting. You can check the semantic description of any tag in Oxygen. This section tries to identify circumstances where multiple tags might work or where the choice of tags is not obvious, and suggests an appropriate tagging.

Headings

Use tag: title in a section or chapter

Use title for a heading.

Note: Use sentence-style capitalization for headings except for the Operations Guide, which follows O'Reilly heading capitalization style.

For example:

Incorrect: Open a File

Correct: Open a file

For task topics, avoid gerunds (_ING_ verbs).

Incorrect: Installing and Configuring Software

Correct: Install and configure software

Do not organize your content so that headings are "stacked" -- meaning, there are two titles directly after each other with no text to introduce the reason for the second title.

Notes

Use tag: note, caution, important, tip, or warning

A brief message that is set off from the main text. Use note for generic messages; the others have more specific semantic meanings, as their names indicate. By default, these elements automatically generate a title (Note, Caution, and so on.) You can customize the title by explicitly adding a title element.

Example

The title element in this example overrides the default title, Note:

<note><title>Upcoming Changes</title>
    <para>Future versions of this feature may not be backward compatible. Consider implementing the revised interface now.
  </para>
</note>

Procedure

Tag to use: procedure

A formal (titled) sequence of steps. Normally, the steps are rendered as a numbered list in the output.

Begin the title with the word, "To", and do not end the title with a colon. Individual steps don't require titles, and step titles do not have to start with "To."

To reduce the number of steps and make long procedures easier to follow, consider breaking steps up into logical groups of substeps.

Example

<procedure>
  <title>To install the software</title>
  <step><para>Download the package.</para>
    <substeps>
      <step><para>Go to the download page.</para></step>
      <step><para>Choose the package for your environment and click <guibutton>Download</guibutton>.</para></step>
   </substeps>
 </step>
 <step><para>Unpack the downloaded file.</para></step>    
</procedure>

To indicate a choice of steps, use stepalternative. The alternative steps are rendered as a bulleted list in the output.

To indicate an optional step, use <step> (Optional) </step> rather than the DocBook performance attribute.

Example

Thanks to Bob Stayton for this clear illustration:

<procedure>
  <step><para>Do part A.</para></step>
  <step><para>Do one of these:</para>
    <stepalternatives>
      <step><para>Do part B.</para></step>
      <step><para>If you can't do part B, do part C.</para></step>
    </stepalternatives>
  </step>
<step><para>Do part D.</para></step>
<step><para>(Optional) Do part E.</para></step>
</procedure>  

Pull conceptual information into an overview before the procedure. Make the steps in the procedure concise. Start each step with a verb. If the step includes a command example, end the introductory sentence with a colon (:).

Example

<section xml:id="xxx"><title>Edit a file</title>
<para>Place concepts in an introductory paragraph before the procedure.</para>
<para>If you want, describe the overall flow in a couple of sentences.</para>
<procedure>
    <step>
        <para>Navigate to the directory that contains the file.</para>
    </step>
    <step>
        <para>Open the file, where <replaceable>MY_FILE</replaceable> is the name of your file:</para>
        <screen><prompt>$</prompt> <userinput>open-file <replaceable>MY_FILE</replaceable></userinput></screen>
    </step>
    <step>
        <para>Edit the file.</para>
    </step>
    <step>
        <para>Make global changes:</para>
        <screen><prompt>$</prompt> <userinput>change-file xyz zyx</userinput></screen>
    </step>
</procedure>

Applications (inline)

Use tag: application

Describes software applications.

Example

<para>You must configure the <application>RabbitMQ</application>.</para>

Code or data

Code or data (block)

Use tag: programlisting

Program source or source fragments formatted as a standalone block. (For inline source fragments see Code or data (inline). Whitespace in the source, including spaces, tabs, and line breaks, is preserved in the output. Text is usually displayed in a fixed-width font.

Example

<programlisting>config-file-example = asdf
foo = bar
hello = world</programlisting>

To optimize the output of programlisting for a specific programming language, use the language attribute. Valid language values include bash, ini, java, javascript, json, python, and xml.

Examples

<programlisting language="json"><xi:include href="samples/agents-put-res.json" parse="text"/></programlisting>

<programlisting language="bash" linenumbering="unnumbered">CACHES = {
  'default': {
    'BACKEND' : 'django.core.cache.backends.memcached.MemcachedCache',
    'LOCATION' : '127.0.0.1:11211'
  }
}</programlisting>

Note: Since programlisting preserves line breaks, add the initial/last line of source code always together with the tag, otherwise an empty line will be inserted:

Do not use

<programlisting>
LINE 1
LINE 2
</programlisting>

Use instead

<programlisting>LINE 1
LINE 2</programlisting>

Options and values

For options and their values in configuration files, always add a space around the "=" sign:

<programlisting>option = value</programlisting>

Boolean configuration options

When documenting boolean configuration options, explicitly include the truth value.

Correct example

force_dhcp_release = True
use_ipv6 = False

Incorrect example

force_dhcp_release
nouse_ipv6

Avoiding empty lines in screen and programlistings

Since screen and programlisting preserve line breaks that you enter, you might get empty lines at the beginning/end of a text if you do not add the tags on the first/last line of the code.

Do not use

<programlisting>
LINE 1
LINE 2
</programlisting>

Use instead

<programlisting>LINE 1
LINE 2</programlisting>

Code or data (inline)

Use tag: literal or code

A fragment of code within a line of text. If you are telling or expecting users to enter the code or data, use userinput instead.

Examples

<para>The file contains the default setting, <literal>use_syslog = True</literal>.</para>
  
<para>The owner is typically set to <literal>root:nova</literal>, and the mode set to 
<literal>0640</literal>.</para>

<para>To set the environment variable, run <code>export token="token"</code.</para>

User input

Use tag: userinput

Text that you instruct or intend users to enter. Compare to code or programlisting, which simply shows an instance of code or data, without telling users to enter it.

You can insert a short userinput into a line of text (such as a para). For multiline input, embed userinput in a screen element, where you can insert line breaks to create each line.

Example

<para>Enter <userinput>admin</userinput> for the username and <userinput>secret</userinput> as the password.</para>

If your command is too long, wrap it and add slashes so that users can copy and paste the line. Also, intent the following line with just a few, usually three, spaces:

<screen><prompt>$</prompt> <userinput>glance image-create --name ubuntu.iso \
   --is-public=True --container-format=bare \
   --disk-format=iso < ubuntu-13.04-server-amd64.iso</userinput></screen>

See Computer output for another multiline example.

Computer output

Use tag: computeroutput

Text displayed in a terminal or log file as the result of a command. You can insert a short computeroutput string into a line of text. For multi-line input, embed computeroutput in a screen element, inserting line breaks to create each line.

Example

This interactive terminal session combines a prompt, user input, and the resulting computer output in a screen:

<para>Mount the image in read-write mode by entering, as root:</para>
<screen><prompt>#</prompt> <userinput>guestfish --rw -a centos63_desktop.img</userinput>
<computeroutput>
Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.

Type: 'help' for help on commands
      'man' to read the manual
      'quit' to quit the shell

>&lt;fs></computeroutput></screen>

Commands, parameters, and variables

Use tags: command and parameter and replaceable

Use for inline commands. Examples are inline sub-commands for the OpenStack nova, swift, or neutron command-line interfaces (CLIs) and inline Linux commands.

For variables, use all caps like <replaceable>VARIABLE</replaceable>. There is more information on variables here.

Note: You do not have to tag the OpenStack CLI name, such as nova. Use the command tag to tag the client sub-commands.

Examples

<para>To launch a virtual machine, use the nova <command>boot</command> command. Use the <parameter>--flavor</parameter> <replaceable>FLAVOR</replaceable> and <parameter>--image</parameter> <replaceable>IMAGE</replaceable> parameters to specify the IDs or names of the flavor and image to use for the image.</para>

Command line prompt

Use tag: prompt

Example

<screen><prompt>#</prompt> <userinput>addgroup nova</userinput></screen>
<screen><prompt>$</prompt> <userinput>glance image-list</userinput></screen>

Note there's a single space between the closing prompt and the opening userinput.

Always use the # prompt if the command needs root privileges to run. Don't use sudo.

Use the $ prompt otherwise.

Configuration options (inline)

Use tag: option

Describes configuration file options.

Example

<para>Set the <option>backend</option> option in the <filename>nova.conf</filename> configuration file.</para>

File name or path

Use tag: filename

Any part of a path specification, including device name, directory, file name, or extension.

Example

<para>By default, the <filename>nova.conf</filename> configuration file is installed in the <filename>/etc/nova</filename> folder.</para>

Packages (inline)

Use tag: package

Describes software packages.

Example

<para>You must install the <package>libvirt</package> package.</para>

Variable text

Use tag: replaceable

Variable content that readers replace with actual instances. The text is frequently italicized in output.

For variables, use all caps like <replaceable>VARIABLE</replaceable>.

Example

<para>The <filename>/etc/<replaceable>SERVICE-CODENAME</replaceable>/policy.json</filename> controls what users are allowed to do for a given service.

Use replaceable also for values that are useable as-is but can be changed. For example the controller node is often called controller but some change it. Or an option like storage_type=ephemeral - where ephemeral is one of several valid types that you can choose.

Example

rabbit_host = <replaceable>controller</replaceable>
rabbit_password = <replaceable>RABBIT_PASS</replaceable>
storage_type= <replaceable>ephemeral</replaceable>

Note: Don't add formatting to replaceable text, for example by surrounding it with quotes or brackets. Let the DocBook style sheets do the formatting.

System and API names

Use tag: systemitem

Operating system or API components that you refer to by name, including system services, daemons, methods, classes, and functions. To refer to an item's location rather than its name, use filename instead. You can use class="service" to further describe the name.

Example

<para>Compute uses the <systemitem class="service">nova-scheduler</systemitem> service to determine how to dispatch compute and volume requests.</para>

Linking

Link to an internal target that has a title

Use tag: xref

Cross-reference an element, in the same document, that can automatically provide the link text. The "hot" link text that appears in the output is generated automatically from the target object during processing. For this reason, xref usually point to targets that have a title or a associated label (such as a numbered step in a procedure).

Compare this to a cross reference using link, where you specify the link text yourself. The advantage of using xref is that the link text is not static: if the title of the target changes, your link text is automatically updated in the next build.

Note that the xref linkend attribute points to the xml:id of the target element, not its title.

Example

The xref in this example points to the figure that follows. In the output, the target title, OpenStack Services, is automatically used as the link text of the cross-reference:

<para>The Image Service is central to the overall IaaS picture, as shown in <xref linkend="concept_arch"/>.</para>
...
<figure xml:id="concept_arch"> 
  <title>OpenStack Services</title>
  <mediaobject>
    <imageobject>
      <imagedata
        fileref="figures/openstack-arch-grizzly-v1-conceptual.jpg"
        contentwidth="6in"/>
    </imageobject>
  </mediaobject>
</figure>

If the target in this example were an informalfigure, which has no title, the output would show "???" as the link text. which is probably not what you want. (For workarounds to this limitation, see the DocBook xref reference.)


Link to an internal target or external resource

Use tag: link

Cross-reference another element (which may or may not have a title) in the same document, or link to an external resource like an HTML page or PDF document. In the content of the link specify the "hot" text that you want to appear in the output.

  • To cross-reference an internal target, in the linkend attribute specify the target element's xml:id.
  • To cross-reference an external target, in the xlink:href attribute specify a URI that points to the target.

Examples

This cross-reference points to an external resource and displays the link text, Nova

<link xlink:href="http://nova.openstack.org">Nova</link>

This cross-reference points to an informal table in the same document, and specifies the link text, OpenStack Services:

<para>The Image Service is central to the overall IaaS picture, as shown in <link linkend="concept_arch2">OpenStack Services</link>.</para>
...
<informalfigure xml:id="concept_arch2"> 
  <mediaobject>
    <imageobject>
      <imagedata
        fileref="figures/openstack-arch-grizzly-v1-conceptual.jpg"
        contentwidth="6in"/>
    </imageobject>
  </mediaobject>
</informalfigure>

As a rule of thumb, use link instead of xref to cross-reference internal targets for which DocBook processing does not automatically generate link text (for example elements without titles). Conversely, if you're cross-referencing an internal target that has a title or label, consider using xref instead of hard-coding the link textlink.

Unlinked URI

Technically, we should use the uri element as shown below, but our tool chain currently makes a live link, so use uri sparingly if at all. Bug logged at https://bugs.launchpad.net/openstack-manuals/+bug/1221225.

Use tag: uri

Provide only the text of a URI, without a live link.

Example

<para>In your Web brower, log in to the Dashboard at <uri>http://192.168.206.130</uri>. </para>

Lists

Choose the appropriate list type to presenting a sequence of items. You can nest lists, including lists of different types. Note: to present steps in a formal task, use procedure instead.

Ordered list

Use tag: orderedlist

A sequence of items whose order matters.

Example

<para>During the migration process:</para>
<orderedlist>
  <listitem><para>The target host ensures that live migration is enabled.</para></listitem>
  <listitem><para>The target host installs the base VHD if it is not already present.</para></listitem>
  <listitem><para>The source host ensures that live migration is enabled.</para></listitem>
  <listitem><para>The source host initiates the migration.</para></listitem>
  <listitem><para>The source host notifies the manager of the outcome of the operation.</para></listitem>
</orderedlist>

Unordered list

Use tag: itemizedlist

A sequence of items that can happen in any order or whose order doesn't matter.

Example

<para>OpenStack with XenAPI supports the following virtual machine image formats:</para>
<itemizedlist>
  <listitem><para>Raw</para></listitem>
  <listitem><para>VHD (in a gzipped tarball)</para></listitem>
</itemizedlist>

Term/description or key/value pairs

Use tag: variablelist

An unordered list in which each item has a short term (such as a key or option) or phrase, followed by a block that describes it. variablelist is typically rendered as a dl definition list in HTML output, with the term highlighted.

Consider using a variable list:

  • Instead of an itemized list when your list has a regular pattern of key/value or term/definition pairs.
  • Instead of a two column table where the first column lists items of a consistent type, such as keys, options, or short terms, and the second column describes the items. Consider that lists are generally more accessible than tables for screen reader users.

Example

This example includes a nested variable list. Nesting lists of different kinds is a way of breaking up information into distinct visual and logical chunks:

<itemizedlist>
  <listitem>
    <para>The system exposes these components to users:</para>
    <variablelist>
      <varlistentry><term>Component A</term>
        <listitem><para>Description of A.</para></listitem>
      </varlistentry>
      <varlistentry><term>Component B</term>
        <listitem><para>Description of B.</para></listitem>
      </varlistentry>
      <varlistentry><term>Component C</term>
        <listitem><para>Description of C. Note: C is available only for these OS's:</para>
          <itemizedlist>
            <listitem><para>Linux</para></listitem>
            <listitem><para>Mac OS X</para></listitem>
          </itemizedlist>
        </listitem>
      </varlistentry>
    </variablelist>
  </listitem>
  <listitem><para>API libraries are also available.</para></listitem>
</itemizedlist>

The example output looks something like this:

* The system exposes these components to users:

  Component A
    Description of A.

  Component B
    Description of B.

  Component C
    Description of C.  Note: C is available only for these OS's:
     * Linux
     * Mac OS X

* API libraries are also available.

Note: Any current usage of bulleted lists that consist of a short term and its definition, should be converted to variable lists. For example, consider the following bulleted list entries:

* Spellchecking: process of correcting spelling
* Pagebreaking—process of breaking pages

These should be rewritten as variable list entries:

Spellchecking
     Process of correcting spelling
Pagebreaking
     Process of breaking pages

A simple, undecorated list of items

Use tag: simplelist

Present a sequence of words or short phrases without the decorations of a numbered or bulleted list. simplelist offers a variety of flavors.

Example (default vertical list)

<para>Valid formats include:</para>
  <simplelist>
    <member>PNG</member>
    <member>JPG</member>
    <member>GIF</member>
    <member>SVG</member>
  </simplelist>

By default, this example is rendered as a standalone block of undecorated items, like this:

Valid formats include:
PNG
JPG
GIF
SVG 

Example (inline list)

You can also render a comma-separated list in a paragraph, by adding the type="inline" attribute:

<para>Valid formats include 
  <simplelist type='inline'>
    <member>PNG</member>
    <member>JPG</member>
    <member>GIF</member>
    <member>SVG</member>
  </simplelist>
</para>

The output looks like this:

Valid formats include PNG, JPG, GIF, SVG.

Image

Use tag: mediaobject

Use mediaobject for a block image. For a formal (titled) image, embed a mediaobject in a figure.

Note: inlinemediaobject inserts an image in a text block, such as a paragraph. For our docs, mediaobject is usually the better choice: inlinemediaobject is typically used for small inline graphics (like icons) or to achieve floating effects, and requires some care to use correctly.


In DocBook source, here is how you include images that have both a scalable-for-print-resolution in the PDF and an online-resolution for the HTML output. In this case the two types of images are SVG and PNG formats. The contentwidth="6in" attribute ensures that the image does not overlap print margins nor take up too much screen space.

<figure xml:id="CFinterfaces">
  <title>Cloud Files System Interfaces</title>
  <mediaobject>
    <imageobject>
      <imagedata contentwidth="6in" fileref="figures/CFinterfaces.svg"/>
    </imageobject>
  </mediaobject>
</figure>

Note: the contentwidth="6in" is used for all guides with the exception of the Training Guides. The Training Guides use contentwidth="7in" since the PDFs is in landscape.

The convention is to use the /src/figures/ directory to store both the source image and any other formats of that same image. The pom.xml file copies the files in the /figures/ directory into the output directory required for HTML in the post processing section.

Also, when you add the image to the /src/figures directory, be sure to tell the source control system that you've added the image. For example, use git add to ensure the images get added to source control so the HTML and PDF output will be built correctly by the Jenkins continuous integration server.

For any figure you create, please also include the source files, even if the image was not created with open source tools, for maintenance purposes. While all OpenStack docs are created with open source in mind, including open-licensed fonts in the output, we are willing to allow non-open authoring or image creation tools if it's more efficient.

For many networking diagrams such as those in the admin guide, as a comment in the docbook there are links to Google Drawing images that are shared so that they can be edited by anyone with the link, then exported to PNG.

For the Operations Guide, the source files are .ai so we have not included them as they are not edited with open source tools. However, if you find an error we can get a copy of those images, and the original SVGs prior to the O'Reilly work are still available.

Tables

Use tag: table, informaltable. Generally speaking we don't use CALS tables, using <tr> <td> markup.

Use table for a formal (titled) table, informaltable for a table with no title.

Use sentence capitalization for table captions and column headings.

Use th for headers - both column and row headers. Using td in headers works as well but th is preferred.

Example

<table rules="all">
  <caption>Hardware recommendations </caption>
  <col width="20%"/>
  <col width="23%"/>
  <col width="57%"/>

  <thead>
    <tr>
      <th>Server</th>
      <th>Recommended hardware</th>
      <th>Notes</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><para>...</para></td>
      ...
    </tr>
   </tbody>
</table>

Profiling (conditional content)

Use tag: any element, with os attribute, audience attribute, and so on. For all profiling attributes, see DocBook: Chapter 26. Profiling (conditional text).

The Install & Deploy Guide has content that depends upon the operating system. Use the os attribute to specify an element that is operating-system specific. Valid values are:

  • ubuntu
  • fedora
  • rhel
  • centos
  • deb

Examples

<screen os="ubuntu"><prompt>$</prompt> <userinput>sudo apt-get install ntp</userinput></screen>

<screen os="rhel;fedora;centos"><prompt>$</prompt> <userinput>yum install ntp</userinput></screen>

Resources

DocBook: Chapter 26. Profiling (conditional text)

API Writers Guide

Menu sequence

Use tag: menuchoice

Example:

Represents the action of navigating a menu to choose an item one or more levels down. Output automatically includes a separator between items.

<para>To download an openrc file in the Dashboard, click 
<menuchoice>
  <guimenu>Settings</guimenu>
  <guimenuitem>Project Settings</guimenuitem>
  <guimenuitem>Download RC File</guimenuitem>
</menuchoice>
.</para>

The output looks like this:

To download an openrc file in the Dashboard, click Settings → Project Settings → Download RC File.

Keyboard key combination

Use tag: keycombo

A sequence of two or more keystrokes or mouse actions. Output automatically includes a + separator between items.

Example

<para>Click <guibutton>Search</guibutton> or press 
<keycombo>
  <keycap>Ctrl</keycap>
  <keycap>F1</keycap>
</keycombo>
.</para>

The output looks like this:

Click Search or press Ctrl+F1.

GUI button

Use tag: guibutton

An item in a window that you select or click.

Example

<para>In the TryStack dashboard, click <guibutton>Login</guibutton>.</para>

Glossary

Use tag: glossterm

This marks a term as appearing in the glossary. Use the baseform attribute if the spelling of the term in the text and the glossary is different.

Note that not all guides include a glossary, currently the Operations Guide, the Security Guide and the Install Guides have a glossary. Before you mark a term with glossterm, check that it appears already in the shared glossary which is available online and as file glossary/glossary-terms.xml in the openstack-manuals repository. Please do not use the term firstterm.

Example

Several <glossterm baseform="user">users</glossterm> might be part of a single <glossterm>tenant</glossterm>

Entities

The common used entities are defined in the file doc/common/entities/openstack.ent. Include this file before using common entities and enhance it as needed. For examples of its usage, see the section Numbers and units.

Numbers and units

Separate numbers and their units by a non-breaking space. Include the common entitites file with the definition of it.

Example

<!DOCTYPE section [
<!ENTITY % openstack SYSTEM "../common/entities/openstack.ent">
%openstack;
]>
...
1&nbsp;TB, is 1024&nbsp;GB.

Emdashes

Do not place spaces before and after emdashes. If you use emdashes, use the &mdash; entitity.

Example

<!DOCTYPE section [
<!ENTITY % openstack SYSTEM "../common/entities/openstack.ent">
%openstack;
]>
...
OpenStack dashboard&mdash;Project tab