namespaces in xml
XML Namespaces provide a method to avoid element name conflicts.
A namespace is a collection of all the names of elements, types, and attributes in a specific schema
- In XML, element names are defined by the developer.
- This often results in a conflict when trying to mix XML documents from different XML applications.
- Namespaces let the parser know which DTD or schema you’re using so you can use the markup from several different DTDs or schemas in one document.
- Namespaces are also called vocabularies because they consist of a collection of names and definitions.
namespace xml
Namespace Declaration
When using prefixes in XML, a namespace for the prefix must be defined.
<element xmlns:name = "URL">
- With the
c:prefix a qualified namespace.- When a namespace is defined for an element, all child elements with the same prefix are associated with the same namespace.
<root> <c:article xmlns:c="https://codejagd.com/xml-namespaces"> <c:title>XML NameSpaces</c:title> <c:author>CJ</c:author> <c:date>2022</c:date> </c:article> </root>
namespaces xml
- The purpose of using an URI is to give the namespace a unique name.
<?xml version="1.0"?> <book xmlns='urn:loc.gov:books' xmlns:isbn='urn:ISBN:0-395-36341-6'> <title>Cheaper by the Dozen</title> <isbn:number>1568491379</isbn:number> </book>
What is URI ?
- A Uniform Resource Identifier (URI) is a string of characters which identifies an Internet Resource.
- The most common URI is the Uniform Resource Locator (URL) which identifies an Internet domain address.