the xmlns attribute specifies the xml namespace for a document. This basically helps to avoid namespace conflicts between different xml documents, if for instance a developer mixes xml documents from different xml applications.

What is xmlns attribute in XML?

The xmlns attribute specifies the xml namespace for a document. Note: The xmlns attribute is required in XHTML, invalid in HTML 4.01, and optional in HTML5.

What is xmlns in Java?

Annotation Type XmlNs

Associates a namespace prefix with a XML namespace URI. Usage. @XmlNs annotation is intended for use from other program annotations. See “Package Specification” in javax. xml.

Why xmlns is added?

You declare default namespace (namespace without prefix) for parent and by default all children should belong to the same namespace. If they don’t, xmlns=”” is generated to show that they don’t belong to parent’s namespace.

What is xmlns XSD?

An XML schema is used to describe what’s valid within an XML instance document. The Less Simple Version : This is the namespace of an XML Schema that describes the structure of an XML Schema. In other words a schema that describes itself. An XML Schema (XSD) must be written using the types defined within this schema.

How does xmlns work?

An XML namespace is a collection of names that can be used as element or attribute names in an XML document. The namespace qualifies element names uniquely on the Web in order to avoid conflicts between elements with the same name.

Is xmlns required?

Note: The xmlns attribute is only required on the outermost svg element of SVG documents. It is unnecessary for inner svg elements or inside HTML documents.

How add xmlns to XML?

XML Namespaces – The xmlns Attribute

When using prefixes in XML, a namespace for the prefix must be defined. The namespace can be defined by an xmlns attribute in the start tag of an element. The namespace declaration has the following syntax. xmlns:prefix=”URI”.

What is purpose of XML Schema?

The purpose of a schema is to define and describe a class of XML documents by using these constructs to constrain and document the meaning, usage and relationships of their constituent parts: datatypes, elements and their content, attributes and their values, entities and their contents and notations.

What is XML syntax?

XML syntax refers to the rules that determine how an XML application can be written. The XML syntax is very straight forward, and this makes XML very easy to learn. Below are the main points to remember when creating XML documents.

Is xmlns an attribute of schema element?

The first xmlns attribute refers to the standard Worldwide Web Consortium (W3C) XML Schema Recommendation that is used by most XML schemas. The other xmlns attributes include references to the basic XML-Data Reduced (XDR) schema elements such as element, attribute, complexType, group, simpleType, and so forth.

How define XSD in XML?

XML Schema Definition (XSD) attributes

They have two properties: name and type. The syntax is written as <xs:attribute name = “x” type = “y”/>. Unlike XSD elements, an XSD attribute is always of the simpleType. It can have a fixed value or a default value.

What is the use of XSD in XML?

The XML Schema definition language (XSD) enables you to define the structure and data types for XML documents. An XML Schema defines the elements, attributes, and data types that conform to the World Wide Web Consortium (W3C) XML Schema Part 1: Structures Recommendation for the XML Schema Definition Language.

What is difference between XSD and XML?

XSD is based and written on XML. XSD defines elements and structures that can appear in the document, while XML does not. XSD ensures that the data is properly interpreted, while XML does not. An XSD document is validated as XML, but the opposite may not always be true.

Why is XSD required?

XSDs constrain the vocabulary and structure of XML documents. Without an XSD, an XML document need only follow the rules for being well-formed as given in the W3C XML Recommendation.

What is XSD and XSL?

XSD is an abbreviation of the XML Schema. The use of XSD is mainly to point out the configuration in which the coded information is being displayed.. The XSD specifies the position which tagged data with XML tag shall be displayed on document. XSL has three major sections: the XSTL, XPath and the XML vocabulary.

What is difference between XSL and XML?

XSLT stands for Extensible Stylesheet Language Transformation. It is a language that was designed to access tree structures. XSLT is used to transform XML data from one format to another automatically .
Difference between XQuery and XSLT :

S.No. XQuery XSLT
7. It is good to access XML database. It is used to transform XML documents.

What is a WSDL file?

WSDL is an XML format for describing network services as a set of endpoints operating on messages containing either document-oriented or procedure-oriented information. The operations and messages are described abstractly, and then bound to a concrete network protocol and message format to define an endpoint.

What is difference between WSDL and XSD?

XSD (XML schema definition) defines the element in an XML document. It can be used to verify if the elements in the xml document adheres to the description in which the content is to be placed. While wsdl is specific type of XML document which describes the web service.

What is REST vs SOAP?

SOAP (Simple Object Access Protocol) is a standards-based web services access protocol that has been around for a long time. Originally developed by Microsoft, SOAP isn’t as simple as the acronym would suggest. REST (Representational State Transfer) is another standard, made in response to SOAP’s shortcomings.


SOAP uses WSDL for communication between consumer and provider, whereas REST just uses XML or JSON to send and receive data. WSDL defines contract between client and service and is static by its nature.

What is difference between DTD and XSD?

DTD are the declarations that define a document type for SGML. XSD describes the elements in a XML document.

Which is better XML or DTD?

There are many differences between DTD (Document Type Definition) and XSD (XML Schema Definition). In short, DTD provides less control on XML structure whereas XSD (XML schema) provides more control.

What is difference between XML and DTD?

XML schemas are written in XML while DTD are derived from SGML syntax. XML schemas define datatypes for elements and attributes while DTD doesn’t support datatypes. XML schemas allow support for namespaces while DTD does not. XML schemas define number and order of child elements, while DTD does not.

What is XLink and XPointer?

XLink defines a standard way of creating hyperlinks in XML documents. XPointer allows the hyperlinks to point to more specific parts (fragments) in the XML document.

What is xmlns XLink?

XLink is used to create hyperlinks in XML documents. XLink is used to create hyperlinks within XML documents. Any element in an XML document can behave as a link. With XLink, the links can be defined outside the linked files. XLink is a W3C Recommendation.

What is XLink and XPath?

XLink is similar to the functionality of the <a> tag in HTML in that XLink allows elements to be inserted into XML documents to create links between resources. XLink also has additional features. XPath is a language that views the XML document as a tree with nodes.