openhab-docs/v2.1/addons/transformations.html

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<h1 id="transformations">Transformations</h1>
<p>Transformations are used to translate between technical and human-readable values for items.</p>
<table id="transformations-overview" class="bordered addon-table">
<thead>
<tr>
<th data-field="label" width="20%">Name</th>
<th data-field="description">Description</th>
</tr>
</thead>
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<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/exec/readme.html">Exec</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Execute an external program, substituting the placeholder <code class="highlighter-rouge">%s</code> in the given command line with the input value, and returning the output of the external program.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/javascript/readme.html">JavaScript</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Transform an input to an output using JavaScript.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/jsonpath/readme.html">JsonPath</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Extract an element of a JSON string using a <a href="https://github.com/jayway/JsonPath#jayway-jsonpath">JsonPath expression</a>.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/map/readme.html">Map</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Transforms the input by mapping it to another string. It expects the mappings to be read from a file which is stored under the <code class="highlighter-rouge">transform</code> folder.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/regex/readme.html">RegEx</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Given a source string and a regular expression, use the regular expression to yield a transformed string.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/scale/readme.html">Scale</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Transform the input by matching it between limits of ranges in a scale file. The input string must be in numerical format.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/xpath/readme.html">XPath</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Transform XML input using an <a href="https://www.w3.org/TR/xpath/#section-Expressions">XPath expression</a>.</p>
</td>
</tr>
<tr class="install-auto since-2x">
<td>
<h4><a href="/v2.1/addons/transformations/xslt/readme.html">XSLT</a></h4>
<img src="/v2.1/images/tag-install-auto.svg" />
</td>
<td><p>Transform input using the XML Stylesheet Language for Transformations (XSLT).</p>
</td>
</tr>
</tbody>
</table>
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