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XSD Vs DTD | There are many differences between XSD and DTD, let us see the most important one but before we will discuss what is XSD and DTD.
XSD stands for XML Schema Definition is a way to describe precisely the XML language. XSDs check the validity of the structure and vocabulary of an XML document against the grammatical rules of the appropriate XML language. XSD supports namespace and uses its own set of namespaces and elements for defining the schema.
DTD stands for Document Type Definition is a set of markup declarations that define a document type for an SGML-family markup language (GML, SGML, XML, HTML). A DTD defines the valid building blocks of an XML document. It defines the document structure with a list of validated elements and attributes. DTD doesn’t support namespace instead it has its own set of keywords for defining a schema. Example:- !DOCTYPE for root tag, !ELEMENT for an element, !ENTITY for defining variables, !ATTLIST for an attribute, and e.t.c.
Table for XSD Vs DTD
| XSD | DTD |
|---|---|
| XSD stands for XML Schema Definition. | DTD stands for Document Type Definition. |
| XSDs are written in XML. | DTDs are derived from SGML syntax. |
| XSD is extensible. | DTD is not extensible. |
| XSD supports namespace and uses its own set of namespaces and elements for defining the schema. | DTD doesn’t support namespace instead it has its own set of keywords for defining a schema. Example:- !DOCTYPE, !ELEMENT, !ENTITY, and e.t.c. |
| It supports datatypes for elements and attributes like boolean, date, string, numerics, and etc. | It doesn’t support datatypes, it has only #PCDATA as the data type for the elements which is used for string. |
| XSD defines order for child elements. | DTD doesn’t define the order for child elements. |
| XSD allows us to specify restriction on data. Example:- <age></age> tag, we can write only digits here. | In DTD, no restriction on datatype validation. |
| XSD learning is easy compared to DTD. | Learning DTD is comparatively harder than XSD. |
| XSD is used in large XML data. Example:- Web services. | DTD is more suitable for small XML data. Example:- book name, company name, and e.t.c. |
| XSD provides more control on XML structure. | DTD doesn’t give us much control over XML structure. |
Also See:- XML Advantages and Disadvantages
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