<dt><var>non_textual_content_images</var></dt>

<dt><var>textual_alternative_images</var></dt>

<li><b>LET</b> <var>real_text</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail[PrimaryContentType = "10" or ProductContentType = "10"]</code>.</li>

<li><b>LET</b> <var>non_textual_content_images</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail[PrimaryContentType = "07" or PrimaryContentType = "18" or PrimaryContentType = "19" or PrimaryContentType = "12" or PrimaryContentType = "49" or PrimaryContentType = "20" or ProductContentType = "07" or ProductContentType = "18" or ProductContentType = "19" or ProductContentType = "12" or ProductContentType = "49" or ProductContentType = "20"]</code>.</li>

<li><b>LET</b> <var>textual_alternative_images</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and (ProductFormFeatureValue = "14" or ProductFormFeatureValue = "15" or ProductFormFeatureValue = "16")]</code>.</li>

<span><b>ELSE IF</b> <var>real_text</var> <b>AND</b> <var>non_textual_content_images</var> <b>AND</b> <b>NOT</b> <var>textual_alternative_images</var>:</span>

<p>This algorithm takes the <var>onix_record_as_text</var> argument: a UTF-8 string representing the ONIX record.</p>

<h4>Understanding the variables</h4>

<dl>

<dt><var>contains_charts_diagrams</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/81/19">code 19 of codelist 81</a> (Figures, diagrams, charts, graphs) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that the product has some information conveyed via some form of illustration, such as a graph, a chart, a diagram, a figure, etc).</p>

</dd>

<dt><var>charts_diagrams_as_non_graphical_data</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/196/16">code 16 of codelist 196</a> (Visualised data also available as non-graphical datas) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that all data presented in a visual format (graph, chart, etc) has an alternative non-graphical presentation of the same data.</p>

</dd>

<dt><var>charts_diagrams_diagrams_as_long_text</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/196/15">code 15 of codelist 196</a> (Full alternative textual description) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that a full alternative textual description has been supplied for all of the graphs, charts, diagrams, or figures necessary to understand the content.</p>

</dd>

<dt><var>contains_chemical_formula</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/81/47">code 47 of codelist 81</a> (Chemical content) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that the publication contains chemical notations, formulae.</p>

</dd>

<dt><var>chemical_formula_as_chemml</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/196/18">code 18 of codelist 196</a> (Accessible chemistry content as ChemML) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that the chemical formulae are presented using ChemML and works with compatible assistive technology.</p>

</dd>

<dt><var>contains_math_formula</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/81/48">code 48 of codelist 81</a> (Mathematical content) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that the publication contains mathematical notation, equations, formulae.</p>

</dd>

<dt><var>math_formula_as_latex</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/196/35">code 35 of codelist 196</a> (Accessible math content as LaTeX) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that the chemical formulae are presented using LaTeX and works with compatible assistive technology.</p>

</dd>

<dt><var>math_formula_as_mathml</var></dt>

<dd>

<p>If true it indicates that the <a href="https://ns.editeur.org/onix/en/196/17">code 17 of codelist 196</a> (Accessible math content as MathML) is present in the ONIX record, otherwise if false it means that the metadata is not present.</p>

<p>This means that there is a positive indication that all mathematical content is presented using MathML and works with compatible assistive technology.</p>

</dd>

</dl>

<h4>Variables setup</h4>

<ol class="condition">

<li><b>LET</b> <var>onix</var> be the result of calling <a href="#pre-processing">pre processing</a> given <var>onix_record_as_text</var>.</li>

<li><b>LET</b> <var>contains_charts_diagrams</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/DescriptiveDetail[PrimaryContentType = "19" or ContentType = "19"] </code>.</li>

<li><b>LET</b> <var>charts_diagrams_as_non_graphical_data</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and ProductFormFeatureValue = "16"]</code>.</li>

<li><b>LET</b> <var>charts_diagrams_diagrams_as_long_text</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and ProductFormFeatureValue = "15"]</code>.</li>

<li><b>LET</b> <var>contains_chemical_formula</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/DescriptiveDetail[PrimaryContentType = "47" or ContentType = "47"] </code>.</li>

<li><b>LET</b> <var>chemical_formula_as_chemml</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and ProductFormFeatureValue = "18"]</code>.</li>

<li><b>LET</b> <var>chemical_formula_as_mathml</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and ProductFormFeatureValue = "34"]</code>.</li>

<li><b>LET</b> <var>contains_math_formula</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/DescriptiveDetail[PrimaryContentType = "48" or ContentType = "48"] </code>.</li>

<li><b>LET</b> <var>math_formula_as_latex</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and ProductFormFeatureValue = "35"]</code>.</li>

<li><b>LET</b> <var>math_formula_as_mathml</var> be the result of calling <a href="#check-for-node">check for node</a> on <var>onix</var>, <code class="xpath">/ONIXMessage/Product/DescriptiveDetail/ProductFormFeature[ProductFormFeatureType = "09" and ProductFormFeatureValue = "17"]</code>.</li>

</ol>

<h4>Instructions</h4>

<ol class="condition">

<li>

<span><b>IF</b> <var>charts_diagrams_diagrams_as_long_text</var>:</span>

<span><b>THEN</b> display <code id="charts-diagrams-formulas-extended">"Charts and diagrams have extended descriptions"</code>.</span>

</li>

<li>

<span><b>IF</b> <var>charts_diagrams_as_non_graphical_data</var>:</span>

<span><b>THEN</b> display <code id="charts-diagrams-formulas-non-graphical-data">"Visualised data also available as non-graphical data"</code>.</span>

</li>

<li>

<span><b>IF</b> <var>chemical_formula_as_chemml</var> <b>OR</b> <var>chemical_formula_as_mathml</var>:</span>

<span><b>THEN</b> display <code id="charts-diagrams-formulas-accessible-chemistry">"Accessible chemistry content"</code>.</span>

</li>

<li>

<span><b>IF</b> <var>math_formula_as_latex</var> <b>OR</b> <var>math_formula_as_mathml</var>:</span>

<span><b>THEN</b> display <code id="charts-diagrams-formulas-accessible-math">"Accessible math content"</code>.</span>

</li>

<li>

<span><b>IF</b> (<var>contains_charts_diagrams</var> <b>OR</b> <var>contains_chemical_formula</var> <b>OR</b> <var>contains_math_formula</var>) <b>AND</b> <b>NOT</b> (<var>charts_diagrams_diagrams_as_long_text</var> <b>OR</b> <var>charts_diagrams_as_non_graphical_data</var> <b>OR</b> <var>chemical_formula_as_chemml</var> <b>OR</b> <var>chemical_formula_as_mathml</var> <b>OR</b> <var>math_formula_as_latex</var> <b>OR</b> <var>math_formula_as_mathml</var>):</span>

<span><b>THEN</b> display <code id="charts-diagrams-formulas-accessible-math">"Accessibility of formulas, charts, and diagrams unknown"</code>.</span>

</li>

</ol>