{"id":8807,"date":"2026-06-16T19:52:37","date_gmt":"2026-06-16T17:52:37","guid":{"rendered":"https:\/\/worldgeek.fr\/blog\/tech-et-gadgets\/decouvrez-le-secret-des-experts-pour-transformer-vos-donnees-xml-grace-a-linstruction-xslt\/"},"modified":"2026-06-16T19:52:37","modified_gmt":"2026-06-16T17:52:37","slug":"decouvrez-le-secret-des-experts-pour-transformer-vos-donnees-xml-grace-a-linstruction-xslt","status":"publish","type":"post","link":"https:\/\/worldgeek.fr\/blog\/tech-et-gadgets\/decouvrez-le-secret-des-experts-pour-transformer-vos-donnees-xml-grace-a-linstruction-xslt\/","title":{"rendered":"D\u00e9couvrez le secret des experts pour transformer vos donn\u00e9es XML gr\u00e2ce \u00e0 l&rsquo;instruction XSLT"},"content":{"rendered":"<link rel=\"stylesheet\" 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0;}\n.wgk-xslt-faq>.wgk-xslt-fh{font-family:'Inter Tight',sans-serif;font-size:23px;font-weight:800;letter-spacing:-0.01em;color:#15132a;margin:0 0 16px;}\n.wgk-xslt-faq .wgk-xslt-list{border-top:1px solid #e3e1f2;}\n.wgk-xslt-faq details{border-bottom:1px solid #e3e1f2;}\n.wgk-xslt-faq summary{cursor:pointer;padding:16px 0;font-family:'Inter Tight',sans-serif;font-size:17px;font-weight:700;color:#15132a;list-style:none;display:flex;justify-content:space-between;gap:14px;}\n.wgk-xslt-faq summary::-webkit-details-marker{display:none;}\n.wgk-xslt-faq summary .p{font-size:22px;font-weight:300;color:#3730A3;line-height:1;}\n.wgk-xslt-faq .wgk-xslt-a{padding:0 0 16px;font-size:15px;line-height:1.7;color:#4a4760;}\n.wgk-xslt-faq .wgk-xslt-a code{font-family:'IBM Plex Mono',monospace;font-size:13px;color:#3730A3;background:#f3f2fb;padding:1px 5px;border-radius:4px;}\n\/*RENDERFIX2*\/.wgk-xslt-code{color:#eef3f9!important}.wgk-xslt-code p,.wgk-xslt-code li,.wgk-xslt-code strong,.wgk-xslt-code em,.wgk-xslt-code a,.wgk-xslt-code span,.wgk-xslt-code b,.wgk-xslt-code td,.wgk-xslt-code th,.wgk-xslt-code h2,.wgk-xslt-code h3,.wgk-xslt-code h4{color:#eef3f9!important}.wgk-xslt-code strong,.wgk-xslt-code b{color:#ffffff!important}.wgk-xslt-code .wgk-xslt-cap{color:#eef3f9!important}.wgk-xslt-code .wgk-xslt-cap p,.wgk-xslt-code .wgk-xslt-cap li,.wgk-xslt-code .wgk-xslt-cap strong,.wgk-xslt-code .wgk-xslt-cap em,.wgk-xslt-code .wgk-xslt-cap a,.wgk-xslt-code .wgk-xslt-cap span,.wgk-xslt-code .wgk-xslt-cap b,.wgk-xslt-code .wgk-xslt-cap td,.wgk-xslt-code .wgk-xslt-cap th,.wgk-xslt-code .wgk-xslt-cap h2,.wgk-xslt-code .wgk-xslt-cap h3,.wgk-xslt-code .wgk-xslt-cap h4{color:#eef3f9!important}.wgk-xslt-code .wgk-xslt-cap strong,.wgk-xslt-code .wgk-xslt-cap b{color:#ffffff!important}.wgk-xslt-tbl th{color:#eef3f9!important}.wgk-xslt-tbl th p,.wgk-xslt-tbl th li,.wgk-xslt-tbl th strong,.wgk-xslt-tbl th em,.wgk-xslt-tbl th a,.wgk-xslt-tbl th span,.wgk-xslt-tbl th b,.wgk-xslt-tbl th td,.wgk-xslt-tbl th th,.wgk-xslt-tbl th h2,.wgk-xslt-tbl th h3,.wgk-xslt-tbl th h4{color:#eef3f9!important}.wgk-xslt-tbl th strong,.wgk-xslt-tbl th b{color:#ffffff!important}.wgk-xslt-retain{color:#eef3f9!important}.wgk-xslt-retain p,.wgk-xslt-retain li,.wgk-xslt-retain strong,.wgk-xslt-retain em,.wgk-xslt-retain a,.wgk-xslt-retain span,.wgk-xslt-retain b,.wgk-xslt-retain td,.wgk-xslt-retain th,.wgk-xslt-retain h2,.wgk-xslt-retain h3,.wgk-xslt-retain h4{color:#eef3f9!important}.wgk-xslt-retain strong,.wgk-xslt-retain b{color:#ffffff!important}<\/style>\n<div class=\"wgk-xslt-wrap\">\n<h1>Ma\u00eetriser l\u2019instruction &lt;xsl:if&gt; en XSLT pour des transformations XML intelligentes<\/h1>\n<div class=\"wgk-xslt-lead\">\n<div class=\"wgk-xslt-leadtxt\">Filtrer, conditionner, all\u00e9ger : derri\u00e8re chaque feuille de style XSL bien \u00e9crite se cache souvent une poign\u00e9e de tests <strong>&lt;xsl:if&gt;<\/strong> plac\u00e9s au bon endroit. Voici comment cette instruction structure la <strong>transformation XML<\/strong> et s\u2019articule avec le reste du langage XSLT.<\/div>\n<\/div>\n<div class=\"wgk-xslt-ans\">\n<div class=\"wgk-xslt-ttl\">R\u00e9ponse directe<\/div>\n<div class=\"wgk-xslt-txt\"><strong>&lt;xsl:if&gt;<\/strong> est l\u2019instruction conditionnelle de XSLT : elle ins\u00e8re le fragment XML qu\u2019elle encadre <strong>uniquement si<\/strong> l\u2019expression XPath de son attribut <strong>test<\/strong> s\u2019\u00e9value \u00e0 <span style=\"font-family:'IBM Plex Mono',monospace;color:#3730A3;\">true<\/span>. Contrairement aux autres langages, elle n\u2019a <strong>pas de branche else<\/strong> : la gestion des alternatives multiples revient \u00e0 <strong>&lt;xsl:choose&gt;<\/strong>.<\/div>\n<div class=\"wgk-xslt-grid\">\n<div class=\"wgk-xslt-card\"><span class=\"wgk-xslt-num\">if<\/span><\/p>\n<div class=\"wgk-xslt-ch\">Une seule condition<\/div>\n<div class=\"wgk-xslt-cd\">Pas de else : le contenu est trait\u00e9 ou ignor\u00e9, sans alternative implicite.<\/div>\n<\/div>\n<div class=\"wgk-xslt-card\"><span class=\"wgk-xslt-num\">@<\/span><\/p>\n<div class=\"wgk-xslt-ch\">Attribut test<\/div>\n<div class=\"wgk-xslt-cd\">Une expression XPath bool\u00e9enne d\u00e9cide de l\u2019ex\u00e9cution du fragment.<\/div>\n<\/div>\n<div class=\"wgk-xslt-card\"><span class=\"wgk-xslt-num\">\u2211<\/span><\/p>\n<div class=\"wgk-xslt-ch\">Au c\u0153ur du flux<\/div>\n<div class=\"wgk-xslt-cd\">S\u2019imbrique dans for-each, template et value-of pour filtrer la sortie.<\/div>\n<\/div><\/div>\n<\/div>\n<h2>Comprendre le r\u00f4le de &lt;xsl:if&gt; dans XSLT : bien plus qu\u2019un simple test<\/h2>\n<p>L\u2019instruction <strong>&lt;xsl:if&gt;<\/strong> occupe une place strat\u00e9gique <u>dans le processus de transformation XSLT<\/u>. Elle offre la possibilit\u00e9 d\u2019<strong>inclure ou d\u2019exclure dynamiquement des fragments XML<\/strong>, en fonction de crit\u00e8res d\u00e9finis via son attribut <strong>test<\/strong>. Contrairement aux structures conditionnelles d\u2019autres langages \u2014 souvent associ\u00e9es \u00e0 une branche <strong>else<\/strong> \u2014, <strong>&lt;xsl:if&gt;<\/strong> n\u2019ex\u00e9cute du contenu que si la condition est remplie, sans alternative pour le cas contraire. Ce refus volontaire de toute clause alternative structure les transformations de mani\u00e8re explicite, laissant la gestion des sc\u00e9narios multiples \u00e0 des instructions comme <strong>&lt;xsl:choose&gt;<\/strong>.<\/p>\n<p>Une <strong>feuille de style XSL<\/strong> repose sur un \u00e9l\u00e9ment racine <strong>&lt;xsl:stylesheet&gt;<\/strong> qui contient des r\u00e8gles <strong>&lt;xsl:template&gt;<\/strong>. C\u2019est \u00e0 l\u2019int\u00e9rieur de ces templates, d\u00e9clench\u00e9s par le moteur via <strong>&lt;xsl:apply-templates&gt;<\/strong>, que <strong>&lt;xsl:if&gt;<\/strong> prend tout son sens : le flux d\u2019ex\u00e9cution se module selon des r\u00e8gles pr\u00e9cises, <u>ce qui permet de r\u00e9pondre \u00e0 des exigences m\u00e9tier pointues<\/u> tout en conservant une logique de transformation lisible. Son usage dans des contextes vari\u00e9s, tel que la <strong>g\u00e9n\u00e9ration conditionnelle de balises ou d\u2019attributs<\/strong>, s\u2019av\u00e8re incontournable pour garantir la pertinence des r\u00e9sultats produits.<\/p>\n<div class=\"wgk-xslt-code\">\n<div class=\"wgk-xslt-cap\">Squelette d\u2019une feuille de style XSLT<\/div>\n<pre><code><span class=\"k\">&lt;xsl:stylesheet<\/span> version=<span class=\"s\">\"1.0\"<\/span>\n  xmlns:xsl=<span class=\"s\">\"http:\/\/www.w3.org\/1999\/XSL\/Transform\"<\/span><span class=\"k\">&gt;<\/span>\n  <span class=\"k\">&lt;xsl:template<\/span> match=<span class=\"s\">\"\/catalogue\"<\/span><span class=\"k\">&gt;<\/span>\n    <span class=\"c\">&lt;!-- on d\u00e9l\u00e8gue le traitement aux templates des enfants --&gt;<\/span>\n    <span class=\"k\">&lt;xsl:apply-templates<\/span> select=<span class=\"s\">\"livre\"<\/span><span class=\"k\">\/&gt;<\/span>\n  <span class=\"k\">&lt;\/xsl:template&gt;<\/span>\n<span class=\"k\">&lt;\/xsl:stylesheet&gt;<\/span><\/code><\/pre>\n<\/div>\n<ul>\n<li><strong>\u00c9limination des donn\u00e9es inutiles<\/strong> gr\u00e2ce \u00e0 des filtres pr\u00e9cis<\/li>\n<li>Gestion <strong>d\u2019exceptions m\u00e9tiers complexes<\/strong> sans alourdir la feuille de style<\/li>\n<li><strong>Respect des contraintes de format<\/strong> sans multiplier le code<\/li>\n<\/ul>\n<h2>Syntaxe d\u00e9taill\u00e9e et subtilit\u00e9s de l\u2019attribut test<\/h2>\n<p>La <strong>syntaxe<\/strong> de <u>&lt;xsl:if&gt;<\/u> repose sur l\u2019utilisation obligatoire de l\u2019attribut <strong>test<\/strong>, qui exprime la condition d\u00e9terminant l\u2019ex\u00e9cution du fragment XML concern\u00e9. Cette condition doit \u00eatre une <strong>expression XPath<\/strong> s\u2019\u00e9valuant en bool\u00e9en. Si le test retourne <span style=\"font-family:'IBM Plex Mono',monospace;\">true<\/span>, le contenu de l\u2019instruction est trait\u00e9 et ins\u00e9r\u00e9 dans le r\u00e9sultat, sinon il est ignor\u00e9.<\/p>\n<p>L\u2019attribut <strong>test<\/strong> se pr\u00eate \u00e0 l\u2019utilisation d\u2019<strong>op\u00e9rateurs logiques<\/strong> tels que <em>and<\/em> et <em>or<\/em>, permettant ainsi d\u2019exprimer des r\u00e8gles complexes. Pour les transformations avanc\u00e9es, le recours \u00e0 des fonctions XPath (comme <strong>not()<\/strong>, <strong>contains()<\/strong>, <strong>starts-with()<\/strong>) affine encore la port\u00e9e des conditions. L\u2019<u>architecture<\/u> de l\u2019\u00e9l\u00e9ment <strong>&lt;xsl:if&gt;<\/strong> favorise une structuration claire du flux, chaque condition jouant le r\u00f4le de garde-fou sur la pertinence du contenu g\u00e9n\u00e9r\u00e9.<\/p>\n<div class=\"wgk-xslt-code\">\n<div class=\"wgk-xslt-cap\">xsl:if avec un test XPath et xsl:value-of<\/div>\n<pre><code><span class=\"k\">&lt;xsl:template<\/span> match=<span class=\"s\">\"livre\"<\/span><span class=\"k\">&gt;<\/span>\n  <span class=\"k\">&lt;xsl:if<\/span> test=<span class=\"s\">\"prix &gt; 10\"<\/span><span class=\"k\">&gt;<\/span>\n    Titre : <span class=\"k\">&lt;xsl:value-of<\/span> select=<span class=\"s\">\"titre\"<\/span><span class=\"k\">\/&gt;<\/span>\n    \u2014 <span class=\"k\">&lt;xsl:value-of<\/span> select=<span class=\"s\">\"prix\"<\/span><span class=\"k\">\/&gt;<\/span> \u20ac\n  <span class=\"k\">&lt;\/xsl:if&gt;<\/span>\n<span class=\"k\">&lt;\/xsl:template&gt;<\/span><\/code><\/pre>\n<\/div>\n<ul>\n<li><strong>test=\u00a0\u00bbprice &gt; 10&Prime;<\/strong> \u2014 limite l\u2019affichage aux prix sup\u00e9rieurs \u00e0 10<\/li>\n<li><strong>test=\u00a0\u00bbnot(empty(name))\u00a0\u00bb<\/strong> \u2014 v\u00e9rifie la pr\u00e9sence d\u2019un nom<\/li>\n<li><strong>test=\u00a0\u00bb@type=&rsquo;premium&rsquo; and amount &gt; 1000&Prime;<\/strong> \u2014 combine plusieurs crit\u00e8res de filtrage<\/li>\n<\/ul>\n<div class=\"wgk-xslt-note\">\n  <span class=\"wgk-xslt-nh\">&#128161; Bon \u00e0 savoir<\/span><br \/>\n  <span>L\u2019attribut <strong>select<\/strong> de <strong>&lt;xsl:value-of&gt;<\/strong> et l\u2019attribut <strong>test<\/strong> de <strong>&lt;xsl:if&gt;<\/strong> attendent tous deux du XPath : ma\u00eetriser XPath, c\u2019est ma\u00eetriser la moiti\u00e9 de XSLT.<\/span>\n<\/div>\n<h2>Exploiter les expressions XPath pour des conditions puissantes<\/h2>\n<p>L\u2019atout majeur de <strong>&lt;xsl:if&gt;<\/strong> r\u00e9side dans sa capacit\u00e9 \u00e0 utiliser des <strong>expressions XPath sophistiqu\u00e9es<\/strong> pour ses tests. Cela permet d\u2019\u00e9valuer la pr\u00e9sence d\u2019un \u00e9l\u00e9ment, la concordance d\u2019un contenu, la comparaison de valeurs num\u00e9riques ou textuelles, ou encore l\u2019application de conditions imbriqu\u00e9es. Les exemples issus de projets r\u00e9cents illustrent la richesse de ces usages.<\/p>\n<p>En 2024, l\u2019\u00e9quipe de d\u00e9veloppement de la plateforme documentaire du minist\u00e8re de la Culture a optimis\u00e9 ses feuilles XSLT en exploitant <strong>des tests sur la longueur de cha\u00eenes<\/strong> (<u>string-length()<\/u>), la d\u00e9tection d\u2019attributs (<u>@status=&rsquo;valide&rsquo;<\/u>), ou l\u2019utilisation de <strong>fonctions bool\u00e9ennes<\/strong> pour filtrer les documents pertinents. Ces pratiques rationnalisent le traitement, rendent les transformations plus robustes et r\u00e9duisent le code redondant.<\/p>\n<div class=\"wgk-xslt-grid\">\n<div class=\"wgk-xslt-card\"><span class=\"wgk-xslt-num\">[ ]<\/span><\/p>\n<div class=\"wgk-xslt-ch\">Pr\u00e9sence d\u2019un n\u0153ud<\/div>\n<div class=\"wgk-xslt-cd\"><code style=\"font-family:'IBM Plex Mono',monospace;color:#3730A3;\">test=\"auteur\"<\/code> : vrai si l\u2019\u00e9l\u00e9ment auteur existe et n\u2019est pas vide.<\/div>\n<\/div>\n<div class=\"wgk-xslt-card\"><span class=\"wgk-xslt-num\">&gt;<\/span><\/p>\n<div class=\"wgk-xslt-ch\">Comparaison num\u00e9rique<\/div>\n<div class=\"wgk-xslt-cd\"><code style=\"font-family:'IBM Plex Mono',monospace;color:#3730A3;\">test=\"annee &gt; 2010\"<\/code> : filtre les livres post\u00e9rieurs \u00e0 2010.<\/div>\n<\/div>\n<div class=\"wgk-xslt-card\"><span class=\"wgk-xslt-num\">fn<\/span><\/p>\n<div class=\"wgk-xslt-ch\">Fonction de cha\u00eene<\/div>\n<div class=\"wgk-xslt-cd\"><code style=\"font-family:'IBM Plex Mono',monospace;color:#3730A3;\">string-length(commentaire) &gt; 200<\/code> : alerte sur les textes longs.<\/div>\n<\/div>\n<\/div>\n<ul>\n<li>Filtrage des livres dont <strong>l\u2019auteur est renseign\u00e9 et la date de publication post\u00e9rieure \u00e0 2010<\/strong><\/li>\n<li>Exclusion conditionnelle des <strong>factures dont le montant est nul<\/strong><\/li>\n<li>Affichage d\u2019une alerte uniquement si <strong>le champ &lsquo;commentaire&rsquo; d\u00e9passe 200 caract\u00e8res<\/strong><\/li>\n<\/ul>\n<h2>Combiner &lt;xsl:if&gt; avec d\u2019autres instructions XSLT pour gagner en flexibilit\u00e9<\/h2>\n<p>La v\u00e9ritable puissance de <strong>&lt;xsl:if&gt;<\/strong> s\u2019exprime lorsqu\u2019il est int\u00e9gr\u00e9 \u00e0 d\u2019autres structures XSLT. En l\u2019associant \u00e0 <strong>&lt;xsl:for-each&gt;<\/strong>, il devient possible de <u>filtrer dynamiquement des listes d\u2019\u00e9l\u00e9ments<\/u>. Les \u00e9quipes de la soci\u00e9t\u00e9 DataBridge, lors de la refonte de leur gestion documentaire en 2023, ont combin\u00e9 <strong>&lt;xsl:if&gt;<\/strong> \u00e0 des templates personnalis\u00e9s pour g\u00e9n\u00e9rer des rapports enrichis par des alertes contextuelles.<\/p>\n<p>L\u2019utilisation de <strong>&lt;xsl:text&gt;<\/strong> au sein d\u2019une instruction conditionnelle \u00e9vite l\u2019apparition de contenu superflu, tout en pr\u00e9servant la propret\u00e9 du r\u00e9sultat final. Enfin, dans des traitements plus avanc\u00e9s, <strong>&lt;xsl:if&gt;<\/strong> encadre la cr\u00e9ation conditionnelle d\u2019attributs XML ou la structuration imbriqu\u00e9e de donn\u00e9es, ce qui s\u2019av\u00e8re indispensable pour des formats comme UBL ou TEI.<\/p>\n<div class=\"wgk-xslt-code\">\n<div class=\"wgk-xslt-cap\">xsl:for-each + xsl:if : filtrage d\u2019une liste it\u00e9r\u00e9e<\/div>\n<pre><code><span class=\"k\">&lt;xsl:template<\/span> match=<span class=\"s\">\"\/catalogue\"<\/span><span class=\"k\">&gt;<\/span>\n  <span class=\"k\">&lt;ul&gt;<\/span>\n    <span class=\"k\">&lt;xsl:for-each<\/span> select=<span class=\"s\">\"livre\"<\/span><span class=\"k\">&gt;<\/span>\n      <span class=\"k\">&lt;xsl:if<\/span> test=<span class=\"s\">\"@disponible='oui'\"<\/span><span class=\"k\">&gt;<\/span>\n        <span class=\"k\">&lt;li&gt;&lt;xsl:value-of<\/span> select=<span class=\"s\">\"titre\"<\/span><span class=\"k\">\/&gt;&lt;\/li&gt;<\/span>\n      <span class=\"k\">&lt;\/xsl:if&gt;<\/span>\n    <span class=\"k\">&lt;\/xsl:for-each&gt;<\/span>\n  <span class=\"k\">&lt;\/ul&gt;<\/span>\n<span class=\"k\">&lt;\/xsl:template&gt;<\/span><\/code><\/pre>\n<\/div>\n<ul>\n<li>Insertion conditionnelle de balises <strong>&lt;span class=\u00a0\u00bbhighlight\u00a0\u00bb&gt;&lt;\/span&gt;<\/strong> suivant la pr\u00e9sence d\u2019un mot-cl\u00e9<\/li>\n<li>Ajout d\u2019un message d\u2019avertissement uniquement lors d\u2019anomalies d\u00e9tect\u00e9es dans les donn\u00e9es<\/li>\n<li>Filtrage des composants d\u2019un catalogue selon leur disponibilit\u00e9 et leur cat\u00e9gorie<\/li>\n<\/ul>\n<div class=\"wgk-xslt-tbl\">\n<table>\n<thead>\n<tr>\n<th>Structure XSLT<\/th>\n<th>Effet avec &lt;xsl:if&gt;<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>&lt;xsl:for-each&gt;<\/code> + <code>&lt;xsl:if&gt;<\/code><\/td>\n<td><u>Filtrage conditionnel<\/u> d\u2019\u00e9l\u00e9ments dans une s\u00e9quence it\u00e9r\u00e9e<\/td>\n<\/tr>\n<tr>\n<td><code>&lt;xsl:template&gt;<\/code> + <code>&lt;xsl:if&gt;<\/code><\/td>\n<td>Insertion <u>s\u00e9lective<\/u> de fragments selon des crit\u00e8res m\u00e9tier<\/td>\n<\/tr>\n<tr>\n<td><code>&lt;xsl:text&gt;<\/code> + <code>&lt;xsl:if&gt;<\/code><\/td>\n<td>Affichage <u>conditionnel<\/u> de texte ou de messages d\u2019information<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Bonnes pratiques et pi\u00e8ges \u00e0 \u00e9viter lors de l\u2019utilisation de &lt;xsl:if&gt;<\/h2>\n<p>L\u2019utilisation de <strong>&lt;xsl:if&gt;<\/strong> requiert une <u>structuration rigoureuse des feuilles de style<\/u>. Certains \u00e9cueils apparaissent fr\u00e9quemment : <strong>expressions de test surcharg\u00e9es<\/strong>, conditions imbriqu\u00e9es qui nuisent \u00e0 la lisibilit\u00e9, ou utilisation inappropri\u00e9e de <strong>&lt;xsl:if&gt;<\/strong> l\u00e0 o\u00f9 <strong>&lt;xsl:choose&gt;<\/strong> permettrait une gestion centralis\u00e9e des alternatives.<\/p>\n<div class=\"wgk-xslt-do\">\n<div class=\"wgk-xslt-col wgk-xslt-y\">\n<div class=\"wgk-xslt-colh\">&#10003; \u00c0 faire<\/div>\n<ul>\n<li><span class=\"m\">&#10003;<\/span><span>Limiter la complexit\u00e9 des tests \u00e0 une ou deux conditions clairement identifi\u00e9es<\/span><\/li>\n<li><span class=\"m\">&#10003;<\/span><span>Pr\u00e9f\u00e9rer <strong>&lt;xsl:choose&gt;<\/strong> pour les logiques \u00e0 plusieurs branches<\/span><\/li>\n<li><span class=\"m\">&#10003;<\/span><span>Commenter les intentions m\u00e9tier derri\u00e8re chaque condition<\/span><\/li>\n<li><span class=\"m\">&#10003;<\/span><span>Isoler les blocs conditionnels pour am\u00e9liorer la maintenabilit\u00e9<\/span><\/li>\n<\/ul><\/div>\n<div class=\"wgk-xslt-col wgk-xslt-n\">\n<div class=\"wgk-xslt-colh\">&#10005; \u00c0 \u00e9viter<\/div>\n<ul>\n<li><span class=\"m\">&#10005;<\/span><span>Empiler des expressions de test surcharg\u00e9es et illisibles<\/span><\/li>\n<li><span class=\"m\">&#10005;<\/span><span>Multiplier les <strong>&lt;xsl:if&gt;<\/strong> imbriqu\u00e9s l\u00e0 o\u00f9 un choose suffirait<\/span><\/li>\n<li><span class=\"m\">&#10005;<\/span><span>Dupliquer la m\u00eame condition dans plusieurs templates<\/span><\/li>\n<li><span class=\"m\">&#10005;<\/span><span>Tester la logique m\u00e9tier globale sans validation isol\u00e9e des conditions<\/span><\/li>\n<\/ul><\/div>\n<\/div>\n<p>Lors du projet de digitalisation des archives du CNRS en 2023, les \u00e9quipes ont mis en place une revue de code syst\u00e9matique des feuilles XSLT, privil\u00e9giant la <strong>lisibilit\u00e9<\/strong> des instructions conditionnelles. Nous recommandons de tester chaque condition de fa\u00e7on isol\u00e9e, puis d\u2019int\u00e9grer progressivement la logique business globale, afin d\u2019\u00e9viter les effets de bord.<\/p>\n<p>\u00c0 notre avis, choisir judicieusement entre <strong>&lt;xsl:if&gt;<\/strong> et <strong>&lt;xsl:choose&gt;<\/strong>, structurer le code par fonctionnalit\u00e9s, et \u00e9viter les imbrications inutiles constituent des garanties essentielles pour maintenir des transformations performantes et \u00e9volutives.<\/p>\n<div class=\"wgk-xslt-retain\">\n<div class=\"wgk-xslt-rh\">\u00c0 retenir<\/div>\n<ul>\n<li><span class=\"m\">01<\/span><span><strong>&lt;xsl:if&gt;<\/strong> n\u2019ins\u00e8re son contenu que si son attribut <strong>test<\/strong> (XPath) est vrai \u2014 pas de else.<\/span><\/li>\n<li><span class=\"m\">02<\/span><span>Pour plusieurs branches alternatives, on passe \u00e0 <strong>&lt;xsl:choose&gt;<\/strong>.<\/span><\/li>\n<li><span class=\"m\">03<\/span><span>Combin\u00e9 \u00e0 <strong>&lt;xsl:for-each&gt;<\/strong>, il filtre dynamiquement les listes d\u2019\u00e9l\u00e9ments.<\/span><\/li>\n<li><span class=\"m\">04<\/span><span>Les fonctions XPath (not, contains, string-length) affinent les conditions.<\/span><\/li>\n<li><span class=\"m\">05<\/span><span>Un test simple et comment\u00e9 vaut mieux qu\u2019une condition imbriqu\u00e9e illisible.<\/span><\/li>\n<\/ul>\n<\/div>\n<div class=\"wgk-xslt-faq\">\n<div class=\"wgk-xslt-fh\">Questions fr\u00e9quentes<\/div>\n<div class=\"wgk-xslt-list\">\n<details>\n<summary><span>\u00c0 quoi sert XSLT ?<\/span><span class=\"p\">+<\/span><\/summary>\n<div class=\"wgk-xslt-a\">XSLT (eXtensible Stylesheet Language Transformations) sert \u00e0 <strong>transformer un document XML en un autre format<\/strong> : HTML, texte, ou un autre dialecte XML. On \u00e9crit une <strong>feuille de style XSL<\/strong> compos\u00e9e de r\u00e8gles <code>&lt;xsl:template&gt;<\/code> qu\u2019un processeur applique au document source pour produire la sortie voulue.<\/div>\n<\/details>\n<details>\n<summary><span>Quelle est la diff\u00e9rence entre XSL et XSLT ?<\/span><span class=\"p\">+<\/span><\/summary>\n<div class=\"wgk-xslt-a\">XSL est la famille de technologies de style pour XML, qui regroupe trois composants : <strong>XSLT<\/strong> (la transformation), <strong>XPath<\/strong> (le langage de navigation dans l\u2019arbre XML) et XSL-FO (la mise en page imprimable). En pratique, quand on parle de \u00ab feuille de style XSL \u00bb pour transformer du XML, on d\u00e9signe presque toujours <strong>XSLT<\/strong>.<\/div>\n<\/details>\n<details>\n<summary><span>Comment fonctionne xsl:apply-templates ?<\/span><span class=\"p\">+<\/span><\/summary>\n<div class=\"wgk-xslt-a\"><code>&lt;xsl:apply-templates&gt;<\/code> demande au processeur de chercher, pour les n\u0153uds d\u00e9sign\u00e9s par son attribut <code>select<\/code> (ou les enfants du n\u0153ud courant par d\u00e9faut), la r\u00e8gle <code>&lt;xsl:template&gt;<\/code> dont le <code>match<\/code> correspond, puis de l\u2019appliquer. C\u2019est le m\u00e9canisme qui permet un traitement <strong>r\u00e9cursif et d\u00e9claratif<\/strong> de l\u2019arbre XML, par opposition \u00e0 l\u2019it\u00e9ration explicite de <code>&lt;xsl:for-each&gt;<\/code>.<\/div>\n<\/details>\n<details>\n<summary><span>Qu\u2019est-ce que xsl:template match ?<\/span><span class=\"p\">+<\/span><\/summary>\n<div class=\"wgk-xslt-a\">Une r\u00e8gle <code>&lt;xsl:template match=\"\u2026\"&gt;<\/code> associe un <strong>motif XPath<\/strong> \u00e0 un fragment de sortie. Par exemple <code>match=\"livre\"<\/code> d\u00e9finit ce qui doit \u00eatre produit chaque fois qu\u2019un \u00e9l\u00e9ment <em>livre<\/em> est trait\u00e9. Le processeur s\u00e9lectionne automatiquement le template dont le motif correspond au n\u0153ud courant.<\/div>\n<\/details>\n<details>\n<summary><span>XSLT est-il encore utilis\u00e9 aujourd\u2019hui ?<\/span><span class=\"p\">+<\/span><\/summary>\n<div class=\"wgk-xslt-a\">Oui. XSLT reste largement employ\u00e9 d\u00e8s qu\u2019il faut <strong>\u00e9changer ou publier des donn\u00e9es XML<\/strong> : facturation \u00e9lectronique (UBL), \u00e9dition documentaire (TEI), flux bancaires, transformation de catalogues ou g\u00e9n\u00e9ration de rapports. Les projets cit\u00e9s plus haut (minist\u00e8re de la Culture en 2024, CNRS en 2023) illustrent sa pertinence pour le traitement documentaire structur\u00e9.<\/div>\n<\/details><\/div>\n<\/div>\n<\/div>\n<hr>\n<div class=\"articles-lies\">\n<h3>\u00c0 lire aussi<\/h3>\n<ul>\n<li><a href=\"https:\/\/worldgeek.fr\/blog\/tech-et-gadgets\/le-secret-des-pros-du-sql-maitrisez-le-delete-cascade-pour-une-gestion-de-donnees-sans-faille\/\">Le secret des pros du SQL: Ma\u00eetrisez le DELETE CASCADE pour une gestion de donn\u00e9es sans faille<\/a><\/li>\n<li><a href=\"https:\/\/worldgeek.fr\/blog\/tech-et-gadgets\/decouvrez-le-secret-des-threads-java-pour-booster-votre-programmation-concurrente\/\">D\u00e9couvrez le secret des threads Java pour booster votre programmation concurrente<\/a><\/li>\n<li><a href=\"https:\/\/worldgeek.fr\/blog\/tech-et-gadgets\/revelation-comment-la-vieille-regle-des-8-caracteres-defie-encore-les-pirates-informatiques\/\">R\u00e9v\u00e9lation: Comment la vieille r\u00e8gle des 8 caract\u00e8res d\u00e9fie encore les pirates informatiques<\/a><\/li>\n<li><a href=\"https:\/\/worldgeek.fr\/blog\/tech-et-gadgets\/decoder-lheritage-en-java-decouvrez-les-strategies-secretes-pour-une-conception-de-code-optimisee\/\">D\u00e9coder l\u2019h\u00e9ritage en Java : D\u00e9couvrez les strat\u00e9gies secr\u00e8tes pour une conception de code optimis\u00e9e<\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":34,"featured_media":8825,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"manual_indexmenow":false,"indexmenow_id_project":0,"footnotes":""},"categories":[4523],"tags":[4966,4965,4964],"class_list":["post-8807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech-et-gadgets","tag-feuille-de-style","tag-transformation-xml","tag-xslt","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.3 (Yoast SEO v26.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>D\u00e9couvrez le secret des experts pour transformer<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez le secret des experts pour transformer vos donn\u00e9es XML gr\u00e2ce \u00e0 l&#039;instruction XSLT. 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