<alternatives>
Alternatives For Processing
Container element used to hold a group of processing alternatives, for example, a single
<graphic> that ships in several formats
(tif, gif, and jpeg) or in different resolutions. This element is a physical grouping to contain multiple logically equivalent (substitutable) versions of the same information object. Typically these are processing alternatives, and the reader is expected to see only one version of the object.
Remarks
<alternatives> is neither inherently block nor inline in nature, because the block or inline quality is determined by context and usage. Typical examples for this element are a <graphic> that ships with a document in multiple versions (for example, as a .tif, a .jpeg, and an SVG file); or an <inline-formula> that is available as a .tif (<inline-graphic>), encoded in MathML, as well as encoded in TeX, and as a plain ASCII.
Accessibility: This element, by providing a container for alternative versions of
a graphic or media object, enables providing a textual alternative to any graphic or media object as well as providing an enlarged graphic version for accessibility.
Content Model
<!ELEMENT alternatives %alternatives-model; >
Expanded Content Model
(chem-struct | code | graphic | inline-graphic | inline-media | inline-supplementary-material | media | preformat | private-char | supplementary-material | table | textual-form | mml:math)+
Description
One or more of any of:
- <chem-struct> Chemical Structure (Display)
- <code> Code
- <graphic> Graphic
- Inline Display Elements
- <inline-supplementary-material> Inline Supplementary Material Metadata
- <media> Media Object
- <preformat> Preformatted Text
- <private-char> Private Character (Custom or Unicode)
- <supplementary-material> Supplementary Material Metadata
- <table> Table (NISO JATS table model)
- <textual-form> Textual Form
- Math Element
This element may be contained in:
<array>, <article-title>, <attrib>, <bold>, <chapter-title>, <chem-struct-wrap>, <comment>, <compound-kwd-part>, <conf-theme>, <def-head>, <disp-formula>, <element-citation>, <fixed-case>, <inline-formula>, <italic>, <mixed-citation>, <monospace>, <overline>, <part-title>, <product>, <roman>, <sans-serif>, <sc>, <see>, <see-also>, <source>, <strike>, <sub>, <subtitle>, <sup>, <supplement>, <support-source>, <table-wrap>, <term>, <term-head>, <title>, <trans-source>, <trans-title>, <underline>, <verse-line>
Example 1
Three alternatives to a table inside a <table-wrap>, one tagged XML and two graphical:
...
<table-wrap id="pbio-0020328-t003" position="float">
<caption>
<title>Systematic Inactivation of SpoIIID-Activated Genes</title>
</caption>
<alternatives>
<graphic xlink:href="pbio.0020328.t003.tif">
<object-id pub-id-type="doi" content-type="image">10.0020328/2007SS000314(2007)</object-id>
</graphic>
<graphic xlink:href="pbio.0020328.t003.gif">
<object-id pub-id-type="doi" content-type="image">10.0020328a/2007SS000314(2007)</object-id>
</graphic>
<table frame="box" rules="all" cellpadding="5">
<thead>
<tr>
<td>Strain</td>
<td>Description</td>
<td>Sporulation Efficiency (Percent)<sup>a</sup></td>
</tr>
</thead>
<tbody>...</tbody>
</table>
</alternatives>
<table-wrap-foot>
<fn id="nt301">
<p><sup>a</sup> Sporulation efficiency is defined as the
number of heat-resistant spores ...</p>
</fn>
</table-wrap-foot>
</table-wrap>
...
Example 2
Two alternatives to a display equation: one MathML-XML-tagged and one graphical:
...
<disp-formula id="pbio-0020328-e001">
<alternatives>
<mml:math display="block" xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mrow><mml:msub>
<mml:mrow><mml:mtext>Strength</mml:mtext></mml:mrow>
<mml:mi>i</mml:mi></mml:msub>
<mml:mo>=</mml:mo>
<mml:mi>log</mml:mi>
<mml:mo>⁡</mml:mo>
<mml:mfrac>...</mml:mfrac>
...
</mml:math>
<graphic xlink:href="pbio.0020328.e001.gif"/>
</alternatives>
</disp-formula>
...
...
<disp-formula id="eq_002">
<label>(2)</label>
<alternatives>
<graphic xlink:href="graphic/eq_002.png"/>
<mml:math>
<mml:mstyle displaystyle="true" scriptlevel="0">
<mml:mi mathvariant="normal">Δ</mml:mi>
<mml:mi>x</mml:mi>
<mml:mi mathvariant="normal">Δ</mml:mi>
<mml:mi>p</mml:mi>
<mml:mo>≥</mml:mo>
<mml:mfrac>
<mml:mn>1</mml:mn>
<mml:mn>2</mml:mn>
</mml:mfrac>
<mml:mi class="MJX-variant">ℏ</mml:mi>
</mml:mstyle>
</mml:math>
</alternatives>
</disp-formula>
...
Example 3
An example of a triple bond glyph. To a chemist, a triple bond is
not the same as Unicode x2261, but using alternatives, as shown below, is sometimes
the easiest way to display the character visually and still stay within
Unicode:
...
<alternatives>
<textual-form specific-use="unicode-look-alike">≡</textual-form>
<private-char name="Triple Bond" description="Chemistry Triple Bond">
<glyph-data id="tbond" format="PBM" resolution="300"
x-size="16" y-size="32">
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
0001111111111111111111111100000
0000000000000000000000000000000
0000000000000000000000000000000
0001111111111111111111111100000
0000000000000000000000000000000
0000000000000000000000000000000
0001111111111111111111111100000
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
0000000000000000000000000000000
</glyph-data>
</private-char>
</alternatives>
...