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There can be other XML nodes outside of the root element. [4] In particular, the root element may be preceded by a prolog, which itself may consist of an XML declaration, optional comments, processing instructions and whitespace, followed by an optional DOCTYPE declaration and more optional comments, processing instructions and whitespace.
There is an element information item for each element appearing in the XML document. One of the element information items is the value of the [document element] property of the document information item, corresponding to the root of the element tree, and all other element information items are accessible by recursively following its [children ...
This article lists the character entity references that are valid in HTML and XML documents. A character entity reference refers to the content of a named entity. An entity declaration is created in XML, SGML and HTML documents (before HTML5) by using the <!ENTITY name "value"> syntax in a Document type definition (DTD).
There is a single "root" element that contains all the other elements. A valid XML document is defined in the XML specification as a well-formed XML document which also conforms to the rules of a Document Type Definition (DTD). According to JavaCommerce.com XML tutorial, "Well formed XML documents simply markup pages with descriptive tags.
The opening <!DOCTYPE syntax is followed by separating syntax [3]: 403–404 (such as spaces, [3]: 297–298, 372 or (except in XML) comments opened and closed by a doubled ASCII hyphen), [3]: 372, 391 followed by a document type name [3]: 403–404 (i.e. the name of the root element that the DTD applies to trees descending from). In XML, the ...
XML Base defines the xml:base attribute, which may be used to set the base for resolution of relative URI references within the scope of a single XML element. XML Information Set or XML Infoset is an abstract data model for XML documents in terms of information items. The infoset is commonly used in the specifications of XML languages, for ...
An XML schema is a description of a type of ... Features available in XSD that are missing from DTDs include: ... It can also request or require that the root element ...
Element declarations, which define properties of elements. These include the element name and target namespace. An important property is the type of the element, which constrains what attributes and children the element can have. In XSD 1.1, the type of the element may be conditional on the values of its attributes.