There are several schema processors available for both languages that support this combined form. K    A unique Internet Media Type is not yet registered for XSDs, so "application/xml" or "text/xml" should be used, as per RFC 3023. Since XML Schema Documents usually have the filename extension ".xsd". Most of RELAX NG's disadvantages are covered under the section on W3C XML Schema's advantages over RELAX NG. In theory, the lack of a specific list allows a processor to support data types that are very problem-domain specific. U    I    Many requirements that are traditionally handled using parameter entities in DTDs have explicit support in XSD: examples include substitution groups, which allow a single name (such as "block" or "inline") to refer to a whole class of elements; complex types, which allow the same content model to be shared (or adapted by restriction or extension) by multiple elements; and model groups and attribute groups, which allow common parts of component models to be defined in one place and reused. We have specified this by setting the minOccurs For WXS validators that will follow a URI to an arbitrary online location, there is the potential for reading something malicious from the other side of the stream.[9]. Of those languages, XDR and SOX continued to be used and supported for a while after XML Schema was published. All XML documents must be well-formed, but it is not required that a document be valid unless the XML parser is "validating", in which case the document is also checked for conformance with its associated schema. validating software. Most large XML parsers, ones that support multiple XML technologies, will provide support for DTDs as well. DTD-validating parsers are most common, but some support XML Schema or RELAX NG as well.

If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning, testing, and training. Bootstrap While Schematron is good at relational constructs, its ability to specify the basic structure of a document, that is, which elements can go where, results in a very verbose schema. The lowercase form is a generic term and may refer to any type of schema, including DTD, XML Schema (aka XSD), RELAX NG, or others, and should always be written using lowercase except when appearing at the start of a sentence. Schema documents are organized by namespace: all the named schema components belong to a target namespace, and the target namespace is a property of the schema document as a whole. When an instance document is validated against a schema (a process known as assessment), the schema to be used for validation can either be supplied as a parameter to the validation engine, or it can be referenced directly from the instance document using two special attributes, xsi:schemaLocation and xsi:noNamespaceSchemaLocation. XML Schemas Support Data Types One of the greatest strength of XML Schemas is the support for data types.