Explain DTD elements and DTD attributes.

 DTD elements:

Elements are the main building blocks of XML document. Elements in a markup language are used to describe the content that it encloses.

            Based on the content of the element, elements are categorized in to 4 types as listed below:

a)    Child elements only

b)    Text only

c)     Empty

d)   Mixed

DTD Attributes:

a)    Attributes provide extra information about elements.

b)    Attributes are always placed inside the opening tag on the element

Attributes always come in name/value pairs.