{"id":9678,"date":"2025-09-02T10:27:54","date_gmt":"2025-09-02T08:27:54","guid":{"rendered":"http:\/\/biblus.accasoftware.com\/fr\/?p=9678"},"modified":"2026-09-29T17:28:29","modified_gmt":"2026-09-29T15:28:29","slug":"larborescence-du-fichier-ifc-le-concept-de-ifcrelationship","status":"publish","type":"post","link":"https:\/\/biblus.accasoftware.com\/fr\/larborescence-du-fichier-ifc-le-concept-de-ifcrelationship\/","title":{"rendered":"L&rsquo;arborescence du fichier IFC: le concept de IfcRelationship"},"content":{"rendered":"<p class=\"sommario\">L&rsquo;IfcRelationship est le deuxi\u00e8me aspect fondamental de la structure des donn\u00e9es de l&rsquo;IFC. Voici les diff\u00e9rents types de relations entre les entit\u00e9s et les propri\u00e9t\u00e9s<\/p>\n<p><!--more--><br \/>\nDans cet article, nous vous parlons du deuxi\u00e8me aspect sur lequel repose la structure de donn\u00e9es IFC (<em>Industry Foundation Classes<\/em>), l&rsquo;<code>IfcRelationship<\/code>, c&rsquo;est-\u00e0-dire les diff\u00e9rents types de relations qui sont \u00e9tablies au sein du format IFC.<\/p>\n<p>Si vous souhaitez v\u00e9rifier concr\u00e8tement le concept de IfcRelationship entre les entit\u00e9s d&rsquo;un b\u00e2timent (ou des parties de celui-ci), telles que les murs, les sols, les fen\u00eatres, vous pouvez utiliser une <a class=\"textualLink_usbim-browser\" href=\"https:\/\/www.accasoftware.com\/fr\/visionneuse-bim\" target=\"_blank\" rel=\"noopener\">visionneuse BIM en ligne<\/a> qui permet l&rsquo;ouverture, l&rsquo;analyse et la gestion d&rsquo;un fichier IFC.<\/p>\n<p>Dans l&rsquo;article pr\u00e9c\u00e9dent, nous avons parl\u00e9 de l&rsquo;<code>IfcObjectDefinition<\/code> et des entit\u00e9s. Voici ci-dessous les liens vers les 3 contenus sur l\u2019arborescence de l&rsquo;IFC&nbsp;:&nbsp;<\/p>\n<ol>\n<li><a href=\"https:\/\/biblus.accasoftware.com\/fr\/larborescence-du-fichier-ifc-ifcobjectdefinition\/\" target=\"_blank\" rel=\"noopener noreferrer\">article sur l&rsquo;IfcObjectDefinition<\/a><\/li>\n<li>article sur l&rsquo;IfcRelationship<\/li>\n<li><a href=\"https:\/\/biblus.accasoftware.com\/fr\/larborescence-du-fichier-ifc-3eme-partie-ifcpropertydefinition\/\" target=\"_blank\" rel=\"noopener\">article sur l&rsquo;IfcPropertyDefinition<\/a> .<\/li>\n<\/ol>\n<h2 id=\"larborescence-dun-modele-ifc\">L&rsquo;arborescence d&rsquo;un mod\u00e8le IFC<\/h2>\n<p>Le sch\u00e9ma IFC peut \u00eatre consid\u00e9r\u00e9 comme un syst\u00e8me de stockage pour l&rsquo;organisation et le transport de donn\u00e9es num\u00e9riques, afin de faciliter l&rsquo;interop\u00e9rabilit\u00e9 entre les diff\u00e9rents intervenants.<\/p>\n<p>L&rsquo;IFC d\u00e9finit un mod\u00e8le compos\u00e9 de centaines d&rsquo;entit\u00e9s organis\u00e9es hi\u00e9rarchiquement.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-9696 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Sans-titre-1.jpg\" alt=\"\" width=\"800\" height=\"299\" \/><noscript><img decoding=\"async\" class=\"aligncenter size-full wp-image-9696 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Sans-titre-1.jpg\" alt=\"\" width=\"800\" height=\"299\" \/><\/noscript><\/p>\n<p>La logique de l&rsquo;IFC est bas\u00e9e sur 3 concepts fondamentaux, qui repr\u00e9sentent la structure elle-m\u00eame et d\u00e9finissent&nbsp;:&nbsp;<\/p>\n<ul>\n<li><code><a href=\"https:\/\/biblus.accasoftware.com\/fr\/larborescence-du-fichier-ifc-ifcobjectdefinition\/\">IfcObjectDefinition<\/a><\/code>: les entit\u00e9s (objets)<\/li>\n<li><code><a href=\"https:\/\/biblus.accasoftware.com\/fr\/larborescence-du-fichier-ifc-le-concept-de-ifcrelationship\/\">IfcRelationship<\/a><\/code>: la relation entre les entit\u00e9s<\/li>\n<li><code>IfcPropertyDefinition<\/code>: les propri\u00e9t\u00e9s associ\u00e9es aux entit\u00e9s.<\/li>\n<\/ul>\n<div id=\"attachment_9702\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-9702\" class=\"size-full wp-image-9702 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Schema-description-IfcRelationship-usBIM-viewer-1.jpg\" alt=\"La diapositive illustre le sch\u00e9ma de description de l'IfcRelationship\" width=\"800\" height=\"299\" \/><p id=\"caption-attachment-9702\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-9702 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Schema-description-IfcRelationship-usBIM-viewer-1.jpg\" alt=\"La diapositive illustre le sch\u00e9ma de description de l'IfcRelationship\" width=\"800\" height=\"299\" srcset=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Schema-description-IfcRelationship-usBIM-viewer-1.jpg 800w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Schema-description-IfcRelationship-usBIM-viewer-1-300x112.jpg 300w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Schema-description-IfcRelationship-usBIM-viewer-1-768x287.jpg 768w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Schema-description-IfcRelationship-usBIM-viewer-1-705x263.jpg 705w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> Arborescence d&rsquo;un fichier IFC | Sch\u00e9ma de description de l&rsquo;IfcRelationship<\/p><\/div>\n<h2 id=\"lifcrelationship\"><span style=\"text-align: center;\">L&rsquo;IfcRelationship<\/span><\/h2>\n<p>L&rsquo;<code>IfcRelationship<\/code> d\u00e9crit les diff\u00e9rents types de relations.<\/p>\n<p>Il existe 5 types fondamentaux de relations dans le mod\u00e8le IFC, qui sont des sous-types de la classe IfcRelationship&nbsp;:&nbsp;<\/p>\n<ol>\n<li><code>IfcRelConnects<\/code> est une relation de connectivit\u00e9 qui relie des objets selon certains crit\u00e8res. Par exemple, une dalle reli\u00e9e \u00e0 une poutre ou une cloison reposant sur un plancher<\/li>\n<li><code>IfcRelAssociates<\/code> indique les sources d&rsquo;information externes et les associe \u00e0 des objets ou \u00e0 des d\u00e9finitions de propri\u00e9t\u00e9. La relation d&rsquo;association est unidirectionnelle. Prenons l&rsquo;exemple d&rsquo;une biblioth\u00e8que IFC externe dans laquelle l&rsquo;objet est d\u00e9fini, ou les informations de classification pour un espace particulier \u00e0 l&rsquo;int\u00e9rieur d&rsquo;un b\u00e2timent<\/li>\n<li><code>IfcRelDecomposes<\/code> d\u00e9finit le concept g\u00e9n\u00e9ral d&rsquo;\u00e9l\u00e9ments qui sont compos\u00e9s ou d\u00e9compos\u00e9s. Les d\u00e9compositions impliquent une d\u00e9pendance, c&rsquo;est-\u00e0-dire que la d\u00e9finition de l&rsquo;ensemble d\u00e9pend de la d\u00e9finition des parties et que les parties d\u00e9pendent de l&rsquo;existence de l&rsquo;ensemble. Ainsi, un \u00e9l\u00e9ment de co\u00fbt peut \u00eatre inclus dans d&rsquo;autres, tout comme un cadre structurel est une agr\u00e9gation de poutres et de colonnes<\/li>\n<li><code>IfcRelDefines<\/code> est une relation qui permet \u00e0 l&rsquo;instance d&rsquo;h\u00e9riter des propri\u00e9t\u00e9s de type. Par exemple, plusieurs fen\u00eatres du mod\u00e8le \u00e0 l\u2019int\u00e9rieur de l&rsquo;IFC peuvent \u00eatre du m\u00eame type (appartenant au m\u00eame catalogue ou au m\u00eame fabricant) et, par cons\u00e9quent, cette relation permet de partager ces informations entre les instances<\/li>\n<li><code>IfcRelAssigns<\/code> explique les relations qui sont \u00e9tablies lorsqu&rsquo;un objet a besoin des services d&rsquo;un autre objet. Par exemple, nous pouvons attribuer une certaine ressource \u00e0 un objet.<\/li>\n<\/ol>\n<p>Chacun de ces 5 types est sp\u00e9cialis\u00e9 dans les relations entre les objets, les types, les propri\u00e9t\u00e9s, etc. (arborescences de sous-type) comme l&rsquo;illustre le sch\u00e9ma suivant&nbsp;:&nbsp;<\/p>\n<div id=\"attachment_9703\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-9703\" class=\"size-full wp-image-9703 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Diagramme-subdivision-IfcRelationship-usBIM-viewer.jpg\" alt=\"Le diagramme de subdivision IfcRelationship subdivision IfcRelationship\" width=\"800\" height=\"299\" \/><p id=\"caption-attachment-9703\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-9703 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Diagramme-subdivision-IfcRelationship-usBIM-viewer.jpg\" alt=\"Le diagramme de subdivision IfcRelationship subdivision IfcRelationship\" width=\"800\" height=\"299\" srcset=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Diagramme-subdivision-IfcRelationship-usBIM-viewer.jpg 800w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Diagramme-subdivision-IfcRelationship-usBIM-viewer-300x112.jpg 300w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Diagramme-subdivision-IfcRelationship-usBIM-viewer-768x287.jpg 768w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/Diagramme-subdivision-IfcRelationship-usBIM-viewer-705x263.jpg 705w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> Arborescence d&rsquo;un fichier IFC | Diagramme de subdivision IfcRelationship<\/p><\/div>\n<p>Dans les images suivantes, nous voyons quelques exemples de relations&nbsp;:&nbsp;<\/p>\n<ul>\n<li>dans la premi\u00e8re, nous voyons comment l&rsquo;<code>IfcRelAggregates<\/code> relie l&rsquo;<code>IfcBuilding<\/code> (b\u00e2timent) avec tous les <strong>niveaux<\/strong> dans lesquels il est divis\u00e9, c&rsquo;est-\u00e0-dire l&rsquo;<code>IfcBuildingStorey<\/code><\/li>\n<li>dans la deuxi\u00e8me <code>IfcRelContainedInSpatialStructure<\/code> relie l&rsquo;<code>IfcBuildingStorey<\/code> avec toutes les<strong> entit\u00e9s<\/strong> qui lui appartiennent<\/li>\n<li>dans la troisi\u00e8me, nous soulignons comment l&rsquo;<code>IfcRelConnectsPathElements<\/code> relie les deux <strong>entit\u00e9s contigu\u00ebs<\/strong> (murs) contenues dans l&rsquo;<code>IfcWallStandardCase<\/code>.<\/li>\n<\/ul>\n<div id=\"attachment_19738\" style=\"width: 808px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-19738\" class=\"size-full wp-image-19738 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey.jpg\" alt=\"IfcRelAggregates | Relation IfcBuilding avec tous les niveaux IfcBuildingStorey\" width=\"798\" height=\"444\" \/><p id=\"caption-attachment-19738\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-19738 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey.jpg\" alt=\"IfcRelAggregates | Relation IfcBuilding avec tous les niveaux IfcBuildingStorey\" width=\"798\" height=\"444\" srcset=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey.jpg 798w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey-300x167.jpg 300w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey-768x427.jpg 768w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey-705x392.jpg 705w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelAggregates-Relation-IfcBuilding-niveaux-IfcBuildingStorey-288x160.jpg 288w\" sizes=\"(max-width: 798px) 100vw, 798px\" \/><\/noscript> <em>IfcRelAggregates | Relation IfcBuilding avec tous les niveaux IfcBuildingStorey<\/em><\/p><\/div>\n<div id=\"attachment_19737\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-19737\" class=\"size-full wp-image-19737 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow.jpg\" alt=\"IfcRelContainedInSpatialStructure | Relation IfcBuildingStorey avec toutes les entit\u00e9s qui lui appartiennent IfcDoor, IfcWallStandardCase, IfcSlab, IfcWindow\" width=\"799\" height=\"444\" \/><p id=\"caption-attachment-19737\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-19737 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow.jpg\" alt=\"IfcRelContainedInSpatialStructure | Relation IfcBuildingStorey avec toutes les entit\u00e9s qui lui appartiennent IfcDoor, IfcWallStandardCase, IfcSlab, IfcWindow\" width=\"799\" height=\"444\" srcset=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow.jpg 799w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow-300x167.jpg 300w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow-768x427.jpg 768w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow-705x392.jpg 705w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelContainedInSpatialStructure-Relation-IfcBuildingStorey-IfcDoor-IfcWallStandardCase-IfcSlab-ifcWindow-288x160.jpg 288w\" sizes=\"(max-width: 799px) 100vw, 799px\" \/><\/noscript> <em>IfcRelContainedInSpatialStructure | Relation IfcBuildingStorey avec toutes les entit\u00e9s qui lui appartiennent IfcDoor, IfcWallStandardCase, IfcSlab, IfcWindow<\/em><\/p><\/div>\n<p>&nbsp;<\/p>\n<div id=\"attachment_19736\" style=\"width: 808px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-19736\" class=\"size-full wp-image-19736 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase.jpg\" alt=\"IfcRelConnectsPathElements | Relation entre deux entit\u00e9s contigu\u00ebs contenues dans IfcWallStandardCase\" width=\"798\" height=\"444\" \/><p id=\"caption-attachment-19736\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-19736 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase.jpg\" alt=\"IfcRelConnectsPathElements | Relation entre deux entit\u00e9s contigu\u00ebs contenues dans IfcWallStandardCase\" width=\"798\" height=\"444\" srcset=\"https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase.jpg 798w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase-300x167.jpg 300w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase-768x427.jpg 768w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase-705x392.jpg 705w, https:\/\/biblus.accasoftware.com\/fr\/wp-content\/uploads\/sites\/4\/2020\/02\/IfcRelConnectsPathElements-Relation-entre-deux-entites-contigues-contenues-IfcWallStandardCase-288x160.jpg 288w\" sizes=\"(max-width: 798px) 100vw, 798px\" \/><\/noscript> <em>IfcRelConnectsPathElements | Relation entre deux entit\u00e9s contigu\u00ebs contenues dans IfcWallStandardCase<\/em><\/p><\/div>\n<div><\/div>\n<div class=\"international-product-banner-desktop\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/fr\/visionneuse-bim\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-browser-fr.jpg\" alt=\"usbim-browser\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-browser-fr.jpg\" alt=\"usbim-browser\" \/><\/noscript><\/a><\/div>\n<div class=\"international-product-banner-mobile\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/fr\/visionneuse-bim\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-browser-fr.jpg\" alt=\"usbim-browser\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-browser-fr.jpg\" alt=\"usbim-browser\" \/><\/noscript><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;IfcRelationship est le deuxi\u00e8me aspect fondamental de la structure des donn\u00e9es de l&rsquo;IFC. Voici les diff\u00e9rents types de relations entre les entit\u00e9s et les propri\u00e9t\u00e9s<\/p>\n","protected":false},"author":27,"featured_media":32085,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_data_scadenza_evento":"","_evento_nome":"","_evento_data":"","_evento_luogo":"","_evento_cta":"","keyword_en":"","keyword_es":"","keyword_fr":"","keyword_de":"","keyword_ptb":"","_note_content":"","footnotes":""},"categories":[1770],"tags":[1791,4800,4934,4953,5014],"class_list":["post-9678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ifc-open-bim","tag-newsletter-136","tag-newsletter-296","tag-newsletter-394","tag-newsletter-412","tag-newsletter-468"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>L&#039;arborescence fichier IFC (partie2) : le concept de l&#039;IfcRelationship<\/title>\n<meta name=\"description\" content=\"IfcRelationship est le deuxi\u00e8me aspect fondamental de la structure des donn\u00e9es de l&#039;IFC. 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