| Class | Description | |
|---|---|---|
 | Attr | Represents a base structure attribute. |
| AttrClsRevision | Contains a structure attribute's (Attr object) class name and its revision. |
| AttrClsRevisionCollection | Represents a collection of AttrClsRevision objects. |
| AttrRevision | Represents a structure attribute (Attr object) and its revision. |
| AttrRevisionCollection | Represents a collection of AttrRevision objects. |
| ContentItemLink | Abstract base class for types representing a content item in a PDF document's structure tree. Each ContentItemLink is associated with a document object that supports the IContentItem interface, typically it is GrapeCity.Documents.Pdf.Page, GrapeCity.Documents.Pdf.Annotations.AnnotationBase, GrapeCity.Documents.Pdf.Graphics.FormXObject etc. |
| MarkInfo | Represents a mark information dictionary. |
| McidContentItemLink | Represents a content item specified via MCID and owning a StructElement. |
| McrContentItemLink | Represents a Marked-Content Sequence as a Content Item in a PDF structure tree (MCR PDF object). |
| ObjrContentItemLink | Represents a custom PDF object as a Content Item in a PDF structure tree (OBJR PDF object). |
| RContentItemLink | Abstract base class for McrContentItemLink and ObjrContentItemLink representing MCR and OBJR PDF objects. |
| RevisionItem | The base abstract class for AttrRevision and AttrClsRevision. |
| RevisionItemCollection<TItem> | The collection of the RevisionItem objects, base abstract class for AttrRevisionCollection and AttrClsRevisionCollection. |
| StandardStructureTypes | The standard structure types. |
| StandardStructureTypes.GroupingElements | Grouping elements are used solely to group other structure elements; they are not directly associated with content items. |
| StructElement | Represents a PDF tag (structure element) in a document's structure tree. |
| StructTreeItem | Abstract base class representing an item in a StructTreeRoot. Derived classes are StructElement and ContentItemLink. |
| StructTreeRoot | Represents the logical structure of a document. |