B2B Integration : A Practical Guide to Collaborative E-commerce

Extensible Markup Language (XML) 169
XML documents. An element is essentially a logical unit of information,
while an attribute is a characteristic of that information. Attributes help
in describing the element in more detail. XML attribute types are of
three kinds: a string type, a set of tokenized types and enumerated
types.
An element declaration has the following syntax:
Syntax:
Elements with data are declared with the data type inside parentheses:
Syntax:
#CDATA implies that the element contains character data (markup
characters like
The keyword ANY declares an element with any content.
Example:
Elements can also be empty:
Empty elements are declared with the keyword EMPTY inside the
parentheses.
Example:
XML element attributes are declared with an ATTLIST declaration.
An attribute declaration has the following syntax: