Document type definition. A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML). A Document Type Definition (DTD) defines the legal building blocks of an XML document. It defines the document structure with a list of legal elements and attributes. A DTD can be declared inline inside an XML document, or as an external reference.
American hornbeam. The American hornbeam is a native forest understory tree in the Chicago area, making it useful for shady landscapes and naturalized or woodland gardens.New leaves emerge reddish-purple, changing to dark green, then turn yellow to orange-red in the fall, offering a kaleidoscope of color throughout the year.merican hornbeam. The American hornbeam is a native forest understory tree in the Chicago area, making it useful for shady landscapes and naturalized or woodland gardens.
Save all your favourite Woodland Trust content in one place. Hornbeam is a deciduous broadleaf tree native to the south of the UK, but widely planted elsewhere. Interesting fact: the name hornbeam comes from the hardness of its timber - âhornâ means âhardâ and âbeamâ was the name for a tree in old English. Overview: often confused with common beech, the bark is pale grey with vertical markings, sometimes with a short, twisted trunk, which develops ridges with age.