---
title: Functions
slug: Web/XPath/Functions
tags:
  - Transforming_XML_with_XSLT
  - XPath
  - XPath_Reference
  - XSLT
  - XSLT_Reference
translation_of: Web/XPath/Functions
---
<p>{{ XsltRef() }}</p>

<p>以下はコア <a href="/ja/docs/XPath">XPath</a> 関数及び <a href="/ja/docs/XSLT">XSLT</a> 固有の追加 XPath 関数の、解説、構文、引数一覧、返される型、該当する W3C 勧告の原典、及び <a href="/ja/docs/Gecko">Gecko</a> での現在の対応状況を含む注釈付きの一覧です。 XPath/XSLT 関数の使用に関するより詳しい情報は、<a href="/ja/docs/Web/XSLT/Transforming_XML_with_XSLT/For_Further_Reading">より詳しい読み物</a>のページをご覧ください。</p>

<ul>
 <li><a href="/ja/docs/XPath/Functions/boolean">boolean()</a></li>
 <li><a href="/ja/docs/ja/XPath/Functions/ceiling">ceiling()</a></li>
 <li><a href="/ja/docs/ja/XPath/Functions/concat">concat()</a></li>
 <li><a href="/ja/docs/XPath/Functions/contains">contains()</a></li>
 <li><a href="/ja/docs/XPath/Functions/count">count()</a></li>
 <li><a href="/ja/docs/XPath/Functions/current">current()</a><em>XSLT 固有</em></li>
 <li><a href="/ja/docs/XPath/Functions/document">document()</a><em>XSLT 固有</em></li>
 <li><a href="/ja/docs/XPath/Functions/element-available">element-available()</a></li>
 <li><a href="/ja/docs/XPath/Functions/false">false()</a></li>
 <li><a href="/ja/docs/XPath/Functions/floor">floor()</a></li>
 <li><a href="/ja/docs/XPath/Functions/format-number">format-number()</a><em> XSLT 固有</em></li>
 <li><a href="/ja/docs/XPath/Functions/function-available">function-available()</a></li>
 <li><a href="/ja/docs/XPath/Functions/generate-id">generate-id()</a><em> XSLT 固有</em></li>
 <li><a href="/ja/docs/XPath/Functions/id">id()</a><em> (一部対応)</em></li>
 <li><a href="/ja/docs/XPath/Functions/key">key() </a><em>XSLT 固有</em></li>
 <li><a href="/ja/docs/XPath/Functions/lang">lang()</a></li>
 <li><a href="/ja/docs/XPath/Functions/last">last()</a></li>
 <li><a href="/ja/docs/XPath/Functions/local-name">local-name()</a></li>
 <li><a href="/ja/docs/XPath/Functions/name">name()</a></li>
 <li><a href="/ja/docs/XPath/Functions/namespace-uri">namespace-uri()</a></li>
 <li><a href="/ja/docs/XPath/Functions/normalize-space">normalize-space()</a></li>
 <li><a href="/ja/docs/XPath/Functions/not">not()</a></li>
 <li><a href="/ja/docs/XPath/Functions/number">number()</a></li>
 <li><a href="/ja/docs/XPath/Functions/position">position()</a></li>
 <li><a href="/ja/docs/XPath/Functions/round">round()</a></li>
 <li><a href="/ja/docs/XPath/Functions/starts-with">starts-with()</a></li>
 <li><a href="/ja/docs/XPath/Functions/string">string()</a></li>
 <li><a href="/ja/docs/XPath/Functions/string-length">string-length()</a></li>
 <li><a href="/ja/docs/XPath/Functions/substring">substring()</a></li>
 <li><a href="/ja/docs/XPath/Functions/substring-after">substring-after()</a></li>
 <li><a href="/ja/docs/XPath/Functions/substring-before">substring-before()</a></li>
 <li><a href="/ja/docs/XPath/Functions/sum">sum()</a></li>
 <li><a href="/ja/docs/XPath/Functions/system-property">system-property()</a><em> XSLT 固有</em></li>
 <li><a href="/ja/docs/XPath/Functions/translate">translate()</a></li>
 <li><a href="/ja/docs/XPath/Functions/true">true()</a></li>
 <li><a href="/ja/docs/XPath/Functions/unparsed-entity-url">unparsed-entity-url()</a><em> XSLT 固有</em><em>(未対応)</em></li>
</ul>

<p>{{QuickLinksWithSubpages("/ja/docs/Web/XPath")}}</p>