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| Ancestors | In the element hierarchy, all elements that are above |
| Attributes | Additional information used to describe an element such as a list or graphic reference number |
| Child elements | Elements that are containing by or subordinate to a higher element. |
| CSS | An abbreviation for cascading style sheet. |
| Descendants | In the element hierarchy, all elements that are subordinate to a parent element |
| DTD | An abbreviation for Document Type Definition, which defines the markup rules used for a given type of structured document. |
| EDD | An abbreviation for Element Definition Document, a document that contains element definitions. |
| Element | A structural unit of a document |
| Element boundaries | Square brackets in the document window that mark where each element begins and ends. |
| Element boundaries as tags | Arrow heads with element names in the document that mark where each element begins and ends. |
| Element bubbles | Rectangular “bubble” shapes in the Structure View that contain the name of an element. The vertical and horizontal connecting lines show how bubbles are related |
| Element Catalog | A collection of element types defined for a document. As you enter elements, the Element Catalog lists the element you can use at the current location. |
| Element hierarchy | The structure that defines which elements are above, subordinate to, or equal to others. |
| ELement Catalog display | Using the Set Available Elements display option to control the elements that appear and can be used depending on the location of the insertion point |
| HTML | An abbreviation for Hypertext Markup Language. HTML is an encoding system used to describe the content and organization of an electronic document published on the World Wide Web. |
| Invalid document | A document that has one or more areas in which correct structuring procedures have not been followed |
| Nesting | When elements are inside other elements they are said to be nested. |
| Parent element | An element that contains other subordinate elements. |
| Root element | The highest level element in a document, in which all other elements are contained |
| SGML | An abbreviation for Standard Generalized Markup Language, an internationally recognized encoding system used to describe the content and organization of an electronic document, independent of platforms and applications. |
| Sibling elements | Elements that are at the same hierarchical level. |
| Text snippet | The beginning text of a text-containing element, located in the Structure View to the right of the element bubble. |
| Valid document | A document in which all elements conform to their defined content requirements (conforms to FrameMaker’s EDD or in SGML/XML a DTD. |
| Validation | Using the Element Validation tool to locate and fix invalid and incomplete elements. |
| XML | An abbreviation for Extensible Markup Language developed ten years ago. |