{"id":13034,"date":"2020-10-23T09:23:35","date_gmt":"2020-10-23T07:23:35","guid":{"rendered":"http:\/\/biblus.accasoftware.com\/en\/?p=13034"},"modified":"2025-04-28T10:45:12","modified_gmt":"2025-04-28T08:45:12","slug":"ifc-schema-part-3-the-ifcpropertydefinition","status":"publish","type":"post","link":"https:\/\/biblus.accasoftware.com\/en\/ifc-schema-part-3-the-ifcpropertydefinition\/","title":{"rendered":"IFC schema: the IfcPropertyDefinition"},"content":{"rendered":"<p class=\"sommario\">IfcPropertyDefinition and IFC data schema: here&#8217;s how to read, edit and add properties to objects in an IFC model<\/p>\n<p><!--more--><\/p>\n<p>In this post we\u2019ll be dealing with the third pillar of the IFC schema, the <code>IfcPropertyDefinition<\/code> or the mechanism that defines the generalization of information (set of properties) that may be assigned to multiple instances of objects addressing aspects such as what IfcPropertyDefinition is and how to add, delete, and edit properties of an information model in IFC format with an <a class=\"textualLink_usbim-editor\" href=\"https:\/\/www.accasoftware.com\/en\/advanced-ifc-editor\" target=\"_blank\" rel=\"noopener\">online IFC editor<\/a>.<\/p>\n<h2 id=\"the-ifc-model-hierarchical-structure\">The IFC model hierarchical structure<\/h2>\n<p>The IFC schema represents a sort of storage system that saves building-object related information ensuring access to the information asset over time and without any restrictions. The IFC standard file structure basically configures a model consisting of hundreds of entities organized hierarchically.<\/p>\n<p>IFC models are described according to the schema objects in three broad categories:<\/p>\n<ul>\n<li><code>IfcObjectDefinition<\/code> and its derived entities, used to implement the definition of the object<\/li>\n<li><code>IfcRelationship<\/code> and its derived entities, identify the definition of relationship<\/li>\n<li><code>IfcPropertyDefinition<\/code> and its derived entities, allow model users to define and use data-driven properties with entities.<\/li>\n<\/ul>\n<div id=\"attachment_13162\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13162\" class=\"size-full wp-image-13162 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema.png\" alt=\"IFC schema hierarchy: the IfcPropertyDefinition\" width=\"800\" height=\"308\" \/><p id=\"caption-attachment-13162\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13162 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema.png\" alt=\"IFC schema hierarchy: the IfcPropertyDefinition\" width=\"800\" height=\"308\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema.png 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema-300x116.png 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema-768x296.png 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema-705x271.png 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-data-schema-416x160.png 416w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IFC schema hierarchy<\/p><\/div>\n<p>Have a look at our previous articles regarding <a href=\"https:\/\/biblus.accasoftware.com\/en\/ifc-file-structure-the-ifcobjectdefinition\/\" target=\"_blank\" rel=\"noopener noreferrer\"><code>IfcObjectDefinition<\/code><\/a> and <a href=\"https:\/\/biblus.accasoftware.com\/en\/ifc-schema-the-ifcrelationship-concept\/\" target=\"_blank\" rel=\"noopener noreferrer\"><code>IfcRelationship<\/code><\/a> to have a complete overview of the 1st level of specialization within the IFC class hierarchy:<\/p>\n<ol>\n<li><a href=\"https:\/\/biblus.accasoftware.com\/en\/ifc-file-structure-the-ifcobjectdefinition\/\" target=\"_blank\" rel=\"noopener noreferrer\">IfcObject (IFC schema part 1)<\/a><\/li>\n<li><a href=\"https:\/\/biblus.accasoftware.com\/en\/ifc-file-structure-the-ifcobjectdefinition\/\" target=\"_blank\" rel=\"noopener noreferrer\">IfcRelationship (IFC schema part 2)<\/a><\/li>\n<li><a href=\"https:\/\/biblus.accasoftware.com\/en\/ifc-schema-part-3-the-ifcpropertydefinition\/\" target=\"_blank\" rel=\"noopener noreferrer\">IfcPropertyDefinition (IFC schema part 3).<\/a><\/li>\n<\/ol>\n<h2 id=\"ifcpropertydefinition\">IfcPropertyDefinition<\/h2>\n<p>The subtype hierarchy of the <code>IfcPropertyDefinition<\/code> includes:<\/p>\n<ul>\n<li><code>IfcPropertySetDefinition<\/code> that is the generalization of property sets.<\/li>\n<li><code>IfcPropertySet<\/code> that represents a supertype of property sets. These properties are defined and qualified by name. Property sets are assigned to objects <code>(IfcObject)<\/code> by means of the <code>IfcRelDefinedByProperties<\/code>relationship.<\/li>\n<li><code>IfcProperty<\/code>that defines the generalization of the property types that can be associated to IFC objects and depends on a property set.<\/li>\n<\/ul>\n<div id=\"attachment_13163\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13163\" class=\"size-full wp-image-13163 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree.jpg\" alt=\"IfcPropertyDefinition tree structure\" width=\"800\" height=\"428\" \/><p id=\"caption-attachment-13163\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13163 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree.jpg\" alt=\"IfcPropertyDefinition tree structure\" width=\"800\" height=\"428\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree-300x161.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree-768x411.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree-705x377.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/Ifc-property-tree-299x160.jpg 299w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IFC file schema | IfcPropertyDefinition tree structure<\/p><\/div>\n<p><code>IfcProperty<\/code>, further subtypes include:<\/p>\n<ul>\n<li><code>IfcComplexProperty<\/code> which is used to define complex properties to be managed within a property set<\/li>\n<li><code>IfcSimpleProperty<\/code> qualifies the properties assigned to a single object. Various subtypes of the <code>IfcSimpleProperty<\/code> determine the different ways in which a property value can be set.<\/li>\n<\/ul>\n<div id=\"attachment_13165\" style=\"width: 1010px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13165\" class=\"size-full wp-image-13165 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty.jpg\" alt=\"IfcPropertyDefinition\" width=\"1000\" height=\"508\" \/><p id=\"caption-attachment-13165\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13165 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty.jpg\" alt=\"IfcPropertyDefinition\" width=\"1000\" height=\"508\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty.jpg 1000w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty-300x152.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty-768x390.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty-705x358.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcsimpleproperty-315x160.jpg 315w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/noscript> IFC file schema | IfcSimpleProperty tree structure<\/p><\/div>\n<h2 id=\"ifcsimpleproperty\">IfcSimpleProperty<\/h2>\n<p>The <code>IfcSimpleProperty<\/code> incorporates 6 different subtypes that are listed below.<\/p>\n<h3><code>IfcPropertySingleValue <\/code><\/h3>\n<p>defines a property object which has a single value assigned through numeric or descriptive elements:<\/p>\n<ul>\n<li>Name<\/li>\n<li>Nominal Value<\/li>\n<li>Type (through IfcValue)<\/li>\n<li>Unit.<\/li>\n<\/ul>\n<p>Example of a property with single value to describe a 4 cm thick door, with transmittance value of 2.6 w \/ (m\u00b2 K) that is produced by &#8220;Manufacturer A&#8221;:<\/p>\n<div id=\"attachment_13167\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13167\" class=\"wp-image-13167 size-full lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue.jpg\" alt=\"IfcPropertySingleValue\" width=\"800\" height=\"145\" \/><p id=\"caption-attachment-13167\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"wp-image-13167 size-full lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue.jpg\" alt=\"IfcPropertySingleValue\" width=\"800\" height=\"145\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue-300x54.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue-768x139.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue-705x128.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertySingleValue-420x76.jpg 420w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IfcPropertySingleValue example<\/p><\/div>\n<h3><code>IfcPropertyEnumeratedValue <\/code><\/h3>\n<p>defines a property object with an assigned value which is chosen from an enumeration. The property-value combination is specified within the <code>IfcPropertyEnumerated<\/code> class, which is a subtype of the <code>IfcPropertyEnumeratedValue.<\/code><\/p>\n<p>Here is an example:<\/p>\n<div id=\"attachment_13169\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13169\" class=\"size-full wp-image-13169 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue.jpg\" alt=\"IfcPropertyEnumeratedValue\" width=\"800\" height=\"98\" \/><p id=\"caption-attachment-13169\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13169 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue.jpg\" alt=\"IfcPropertyEnumeratedValue\" width=\"800\" height=\"98\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue-300x37.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue-768x94.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue-705x86.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyEnumeratedValue-420x51.jpg 420w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IfcPropertyEnumeratedValue example<\/p><\/div>\n<h3><code>IfcPropertyBoundedValue<\/code><\/h3>\n<p>defines a property object which has two (numeric or descriptive) values assigned: the value specifying the upper bound and the value specifying the lower bound.<\/p>\n<p>This property could, for instance, determine size and weight dimensions of an object to be moved in a construction site.<\/p>\n<div id=\"attachment_13170\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13170\" class=\"size-full wp-image-13170 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue.jpg\" alt=\"IfcPropertyBoundedValue\" width=\"800\" height=\"138\" \/><p id=\"caption-attachment-13170\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13170 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue.jpg\" alt=\"IfcPropertyBoundedValue\" width=\"800\" height=\"138\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue-300x52.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue-768x132.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue-705x122.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyBoundedValue-420x72.jpg 420w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IfcPropertyBoundedValue example<\/p><\/div>\n<p>&nbsp;<\/p>\n<h3><code>IfcPropertyTableValue<\/code><\/h3>\n<p>defines a property object which has two lists of values assigned, which specify a table with two columns. The values shown in the first column establish the scope of application for the values in the second column<\/p>\n<p>For example, the table below illustrates\u00a0 the values of sound transmission loss within a certain range.<\/p>\n<div id=\"attachment_13172\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13172\" class=\"wp-image-13172 size-full lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue.jpg\" alt=\"ifcPropertyTableValue\" width=\"800\" height=\"110\" \/><p id=\"caption-attachment-13172\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"wp-image-13172 size-full lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue.jpg\" alt=\"ifcPropertyTableValue\" width=\"800\" height=\"110\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue-300x41.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue-768x106.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue-705x97.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/ifcPropertyTableValue-420x58.jpg 420w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IfcPropertyTableValue example<\/p><\/div>\n<p>&nbsp;<\/p>\n<h3><code>IfcPropertyReferenceValue<\/code><\/h3>\n<p>assigns a value to the property set through a link with predefined complex properties within the IFC schema.<\/p>\n<h3><code>IfcPropertyListValue<\/code><\/h3>\n<p>defines a property to which multiple values are assigned. These values are given by a precise and ordered list (the order in which the values are displayed is significant). Each value in the list is unique and duplicate values are not allowed.<\/p>\n<p>The listed property values could, for example, determine the dimensions to produce a specific construction.<\/p>\n<div id=\"attachment_13173\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-13173\" class=\"size-full wp-image-13173 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue.jpg\" alt=\"IfcPropertyListValue\" width=\"800\" height=\"121\" \/><p id=\"caption-attachment-13173\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-13173 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue.jpg\" alt=\"IfcPropertyListValue\" width=\"800\" height=\"121\" srcset=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue.jpg 800w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue-300x45.jpg 300w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue-768x116.jpg 768w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue-705x107.jpg 705w, https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/02\/IfcPropertyListValue-420x64.jpg 420w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript> IfcPropertyListValue example<\/p><\/div>\n<p>Just remember that to view the entity properties of a 3D model, you can use a free online <a href=\"https:\/\/www.accasoftware.com\/en\/bim-viewer?_gl=1*1gkklbn*_ga*MTk3OTcyMjQwLjE2NTY0MjcwODU.*_ga_K4Y50QD36K*MTY4ODQ2MzA1Ny4xMzUuMS4xNjg4NDY0NTM1LjAuMC4w\">BIM viewer<\/a>. You simply need to:<\/p>\n<ul>\n<li>upload an IFC file to the <a href=\"https:\/\/cloud.usbim.com\/home\/workspaces\">usBIM cloud<\/a>;<\/li>\n<li>open the file;<\/li>\n<li>select the entity;<\/li>\n<li>read the entity properties in the tool box on the right-hand side.<\/li>\n<\/ul>\n<h2 id=\"examples-of-properties-associated-to-entities\">Examples of properties associated to entities<\/h2>\n<p>The figures below show some examples of properties associated to entities.<\/p>\n<p>Specifically, in the first figure you can see a model object; while in the toolbox to the right, you&#8217;ll be able to read the entity related properties.<\/p>\n<div id=\"attachment_28267\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-28267\" class=\"wp-image-28267 size-full lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/reading-element-properties.jpg\" alt=\"IFC schema: the IfcPropertyDefinition\" width=\"799\" height=\"452\" \/><p id=\"caption-attachment-28267\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"wp-image-28267 size-full lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/reading-element-properties.jpg\" alt=\"IFC schema: the IfcPropertyDefinition\" width=\"799\" height=\"452\" \/><\/noscript> Figure 1 | Reading the general properties of an element<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>Figure 2 shows how to edit, delete or add entity properties such as the envelope properties included in the <code>IfcWallStandardCase.<\/code><\/p>\n<div id=\"attachment_28269\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-28269\" class=\"size-full wp-image-28269 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/edit-ass-delete-properties.jpg\" alt=\"IFC schema: the IfcPropertyDefinition\" width=\"799\" height=\"433\" \/><p id=\"caption-attachment-28269\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-28269 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/edit-ass-delete-properties.jpg\" alt=\"IFC schema: the IfcPropertyDefinition\" width=\"799\" height=\"433\" \/><\/noscript> Figure 2 | Edit, insert, delete properties of an element<\/p><\/div>\n<p>Finally, the third image shows you how to check the inserted properties in the toolbox to the right.<\/p>\n<div id=\"attachment_28270\" style=\"width: 809px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-28270\" class=\"size-full wp-image-28270 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/viewing-element-properties.jpg\" alt=\"IFC schema: the IfcPropertyDefinition\" width=\"799\" height=\"451\" \/><p id=\"caption-attachment-28270\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-28270 lazyload\" src=\"https:\/\/biblus.accasoftware.com\/en\/wp-content\/uploads\/sites\/2\/2020\/10\/viewing-element-properties.jpg\" alt=\"IFC schema: the IfcPropertyDefinition\" width=\"799\" height=\"451\" \/><\/noscript> Figure 3 | Viewing the properties added and\/or changed<\/p><\/div>\n<p>&nbsp;<\/p>\n<div class=\"international-product-banner-desktop\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=https:\/\/www.accasoftware.com\/en\/ifc-viewer 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-viewer-en.jpg\" alt=\"usbim-viewer\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/usbim-viewer-en.jpg\" alt=\"usbim-viewer\" \/><\/noscript><\/a><\/div>\n<div class=\"international-product-banner-mobile\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=https:\/\/www.accasoftware.com\/en\/ifc-viewer 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-viewer-en.jpg\" alt=\"usbim-viewer\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/usbim-viewer-en.jpg\" alt=\"usbim-viewer\" \/><\/noscript><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>IfcPropertyDefinition and IFC data schema: here&#8217;s how to read, edit and add properties to objects in an IFC model<\/p>\n","protected":false},"author":19,"featured_media":13069,"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":[1890],"tags":[5062,2441,4901,5075],"class_list":["post-13034","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ifc-open-bim","tag-acca-viewer","tag-newsletter-137","tag-newsletter-166","tag-newsletter-297"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - 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