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Which attribute is used to reference an XML Schema?

The ‘schemaLocation’ attribute is used to reference XML Schema(s) that are defined in a target-namespace. The schemaLocation attribute can contain a list of namespaces and schema-locations, separated by white-space.

What is the limitation of using XS ID in XML Schema?

Among the many constraints, note in particular that xs:ID s cannot have : characters anywhere in the name and cannot have a digit as the first character of the name.

What is an ID in XML?

Description. Under XML 1.0, an ID is a unique identifier to aid in processing. You can annotate an element uniquely with an attribute of type ID, as in id=”i-35867″ (IDs can’t start with a number), which often assumes an associated DTD containing the attribute-list declaration

What is XSI schemaLocation in XML?

The xsi:schemaLocation attribute locates schemas for elements and attributes that are in a specified namespace. Its value is a namespace URI followed by a relative or absolute URL where the schema for that namespace can be found. It is most commonly attached to the root element but can appear further down the tree.

What is XS NCName?

An xs:NCName is a noncolonized name as defined in “Namespaces in XML” 1.0. This is a legal XML name that does not contain a colon. The value must consist exclusively of letters, digits, ideographs, and the underscore, hyphen, and period.

What is ID in XSD?

The purpose of the xsd:ID datatype is to define unique identifiers that are global to a document and emulate the ID attribute type available in the XML DTDs. Unlike their DTD counterparts, W3C XML Schema ID datatypes can be applied to not only attributes but also simple element content.

Can XML ID start with number?

You should not start with numbers. XML elements must follow these naming rules: Names can contain letters, numbers, and other characters. Names cannot start with a number or punctuation character.

What are the basic rules while writing XML?

XML Syntax Rules

  • XML Documents Must Have a Root Element.
  • The XML Prolog.
  • All XML Elements Must Have a Closing Tag.
  • XML Tags are Case Sensitive.
  • XML Elements Must be Properly Nested.
  • XML Attribute Values Must Always be Quoted.
  • Entity References.
  • Comments in XML.