Validating xml with xsd in java
(This description is painted with broad strokes -- there are exceptions.)Until recently, the exact Application Programming Interface (API) by which programs requested validation varied with the schema language and parser.DTDs and XSD were normally accessed as configuration options in Simple API for XML (SAX), Document Object Model (DOM), and Java™ API for XML Processing (JAXP). Schematron might use the Transformations API for XML(Tr AX); and still other schema languages required programmers to learn still more APIs, even though they were performing essentially the same operation.For example, suppose you want to log all validation errors, but you don't want to stop processing when you encounter one.You can install an error handler such as that in Listing 3. For example, they can provide default attribute values.You can define a mini-schema language, write a quick implementation, and plug it into the validation layer.The default response from a schema is to throw a to receive more detailed information about the document's problems.
This package is also available in Java 1.3 and later when you install JAXP 1.3 separately.
It can also tell you whether an attribute is an ID, and whether the attribute was explicitly specified in the document or defaulted in from the schema. book: #Anon Type_book title: #Anon Type_title subtitle: #Anon Type_subtitle info: #Anon Type_info copyright: #Anon Type_copyright year: #Anon Type_year holder: #Anon Type_holder author: #Anon Type_author personname: #Anon Type_personname firstname: #Anon Type_firstname othername: #Anon Type_othername surname: #Anon Type_surname personblurb: #Anon Type_personblurb para: #Anon Type_para link: #Anon Type_link As you can see, the Doc Book schema assigns most elements anonymous complex types.
Obviously, this will vary from one schema to the next.
For example, Listing 2 shows a program that validates Doc Book documents against Doc Book's RELAX NG schema. The only things that have changed are the location of the schema and the URL that identifies the schema language. Implementations are free to add other URLs to this list to identify other schema languages.
Typically, the URL is the namespace Uniform Resource Identifier (URI) for the schema language. However, you can install additional libraries that add support for these and other schema languages.
Then, install your JAR in one of these four locations.