Editing Node (computer science) (section)

==Markup languages==
Another common use of node trees is in [[web development]]. In programming, [[XML]] is used to communicate information between computer programmers and computers alike. For this reason XML is used to create common [[communication protocol]]s used in [[office productivity software]], and serves as the base for the development of modern web [[markup language]]s like [[XHTML]]. Though similar in how it is approached by a programmer, [[HTML]] and [[CSS]] is typically the language used to develop website text and design. While XML, HTML and XHTML provide the language and expression, the [[Document Object Model|DOM]] serves as a translator.<ref>{{cite web|url=https://www.w3schools.com/dom/dom_intro.asp|title=XML DOM Introduction|publisher=[[W3Schools]]|url-status=dead|archive-url=https://web.archive.org/web/20140611052725/https://www.w3schools.com/dom/dom_intro.asp|archive-date=2014-06-11|access-date=2018-04-07}}</ref>

=== Node type ===
Different types of nodes in a tree are represented by specific interfaces. In other words, the node type is defined by how it communicates with other nodes. Each node has a node type property, which specifies the type of node, such as sibling or leaf.
For example, if the node type property is the constant properties for a node, this property specifies the type of the node. So if a node type property is the constant node ELEMENT_NODE, one can know that this node object is an object Element. This object uses the Element interface to define all the methods and properties of that particular node.

Different W3C [[World Wide Web Consortium]] node types and descriptions:
*'''Document''' represents the entire document (the root-node of the DOM tree) 	
*'''DocumentFragment''' represents a "lightweight" Document object, which can hold a portion of a document
*'''DocumentType''' provides an interface to the entities defined for the document
*'''ProcessingInstruction''' represents a processing instruction
*'''EntityReference''' represents an entity reference
*'''Element''' 	represents an element
*'''Attr''' represents an attribute
*'''Text''' represents textual content in an element or attribute
*'''CDATASection''' represents a [[CDATA]] section in a document (text that will NOT be parsed by a parser)
*'''Comment''' represents a comment
*'''Entity''' represents an entity
*'''Notation''' represents a notation declared in the DTD
{| class="wikitable"
|-
! NodeType !! Named constant
|-
| 1|| ELEMENT_NODE
|-
| 2|| ATTRIBUTE_NODE
|-
| 3|| TEXT_NODE
|-
| 4|| CDATA_SECTION_NODE
|-
| 5|| ENTITY_REFERENCE_NODE
|-
| 6|| ENTITY_NODE
|-
| 7|| PROCESSING_INSTRUCTION_NODE
|-
| 8|| COMMENT_NODE
|-
| 9|| DOCUMENT_NODE
|-
| 10|| DOCUMENT_TYPE_NODE
|-
| 11|| DOCUMENT_FRAGMENT_NODE
|-
| 12|| NOTATION_NODE
|}

=== Node object ===
A node object is represented by a single node in a tree. It can be an element node, attribute node, text node, or any type that is described in section "node type". All objects can inherit properties and methods for dealing with parent and child nodes, but not all of the objects have parent or child nodes. For example, with text nodes that cannot have child nodes, trying to add child nodes results in a [[Document Object Model|DOM]] error.

Objects in the DOM tree may be addressed and manipulated by using methods on the objects. The public interface of a DOM is specified in its [[application programming interface]] (API). The history of the Document Object Model is intertwined with the history of the "[[browser wars]]" of the late 1990s between [[Netscape Navigator]] and [[Microsoft Internet Explorer]], as well as with that of [[JavaScript]] and [[JScript]],  the first [[scripting language]]s to be widely implemented in the [[Browser engine|layout engine]]s of [[web browser]]s.