Validating xml using java
Follow the basic steps in this section to write Java programs that use the In LAX mode, you can validate parts of the XML content of an instance document without validating the whole document.A LAX parser indicates that the processor should perform validation for elements in the instance document that are declared in an associated XML schema.The processor does not consider the instance document invalid if it contains no elements declared in the schema.By using LAX mode, you can define the schema only for the part of the XML that you want to validate.The reason is that XML software should be small, fast, and compatible.HTML browsers are allowed to display HTML documents with errors (like missing end tags). A "well formed" XML document is not the same as a "valid" XML document. In addition, it must conform to a document type definition.The processor supports both LAX and strict validation.You can use the processor in the following ways: program illustrates how to validate against an implicit XML Schema.
Validation is the process by which you verify an XML document against its associated DTD, ensuring that the structure, use of elements, and use of attributes are consistent with the definitions in the DTD.
There are two ways to do that: , which stands for "XML Schema instance." The second line specifies the schema to use for elements in the document that do not have a namespace prefix-that is, for the elements you typically define in any simple, uncomplicated XML document.
(You will see how to deal with multiple namespaces in the next section.) You can also specify the schema file in the application, which is the case for Here, too, there are mechanisms at your disposal that will let you specify multiple schemas. Namespaces let you combine elements that serve different purposes in the same document without having to worry about overlapping names.
XML DTDs are a subset of those available in SGML and provide a mechanism for declaring constraints on XML markup.
XML DTDs enable the specification of the following: An XML DTD is not itself written in XML, but is a context-independent grammar for defining the structure of an XML document.
Note the following aspects of parsers that perform DTD validation: A validating XML parser tries to determine whether an instance document conforms to the rules of its associated XML schema.