What is DTD

DTD stands for Document Type Definition. It defines the legal building blocks of an XML document. It is used lớn define document structure with a danh mục of legal elements và attributes.

Purpose of DTD

Its main purpose is to define the structure of an XML document. It contains a danh sách of legal elements và define the structure with the help of them.

Checking Validation

Before proceeding with XML DTD, you must kiểm tra the validation. An XML document is called "well-formed" if it contains the correct syntax.

Bạn đang xem: Introduction to dtd

A well-formed & valid XML document is one which have been validated against DTD.

Visit http://www.xmlvalidation.com lớn validate the XML file.

Valid & well-formed XML document with DTD

Let"s take an example of well-formed and valid XML document. It follows all the rules of DTD.

employee.xml


vimal jaiswal vimal
pragamisiones.com

employee.dtd


Test it Now

Description of DTD

XML DTD with entity declaration

An entity has three parts:

An ampersand (&)An entity nameA semicolon (;)

Syntax to lớn declare entity:


author.xml


>>&sj;
Test it Now

In the above example, sj is an entity that is used inside the tác giả element. In such case, it will print the value of sj entity that is "Sonoo Jaiswal".

Xem thêm: Ioe - Hấp Dẫn Mê Say Thấy Ngay Kết Quả

Note: A single DTD can be used in many XML files.
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