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Xml validating reader

xml validating reader-68

This means which elements can reside in which other elements, which attributes are and are not legal to have on a particular element, and so forth.A schema is analogous to a grammar for a language; a schema defines what the vocabulary for the language may be and what a valid "sentence" is.

To get around this limitation you could use a streaming parser, such as Woodstox (which implements standard Stax API). Not only can you validate the documents structure, but you can supply some pretty complex rules about what type of content your nodes and attributes can contain.The Document Type Definition (DTD) language, which is native to the XML specification, is a schema language that is of relatively limited capability, but that also has other uses in XML aside from the expression of schemas.Two more expressive XML schema languages in widespread use are XML Schema (with a capital S) and RELAX NG.In fact, the spec defines well-formedness because you can't always use a DTD. That is, if he actually doesn't need the document in memory - I don't think he's implied that really.In that case, there is sample code to do exactly the same thing using SAX here: problem.There are historic and current XML schema languages: The main ones (see also the ISO 19757's endorsed languages) are described below.

Though there are a number of schema languages available, the primary three languages are Document Type Definitions, W3C XML Schema, and RELAX NG.

In practice, however, many schema validators are integrated with an XML parser.

There are several different languages available for specifying an XML schema. The primary purpose of a schema language is to specify what the structure of an XML document can be.

The process of checking to see if a XML document conforms to a schema is called validation, which is separate from XML's core concept of syntactic well-formedness.

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.

Document Builder Factory factory = Document Builder Instance(); Validating(false); Namespace Aware(true); Document Builder builder = Document Builder(); Error Handler(new Simple Error Handler()); // the "parse" method also validates XML, will throw an exception if misformatted Document document = builder.parse(new Input Source("document.xml")); This came from this website, which provides various methods for validating XML with Java.