Difference between validation and non validating parsers with xml
The code in this section is contained in Echo Once you've learned more about namespaces, you'll see how to use XML Schema to validate complex documents that use them. What happens when you run the parser on your current version of the slide presentation, with the DTD specified? To fix the problem, add the question mark highlighted below to make title an optional element: The appropriate error handler must be set. Two things to understand about the validating parser at the outset are:
Passed This processor was quite good about not rejecting documents it should have accepted, but needs some work yet on reporting the correct data and on rejecting some illegal documents. Valid means that well-formed XML meets additional requirements given by a specified schema. Each attribute has a value, the quoted text to the right of the equal sign. A data object is an XML document if it is well-formed , as defined in this specification. Those ideas are discussed in Validating with Multiple Namespaces. So now you know that a DTD is a requirement for a valid document. 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. Second declarations of attributes not being ignored; Incorrect whitespace treatment in attribute values and in entity expansions; Misinterpretation of multibyte UTF-8 input characters; SAX DTDHandler callbacks not being invoked. The output looks like this: With a schema declaration in the XML document. Data-Centric," in which both text and element content may appear as the content of a parent element. Although in this case the value is a single word, values can be any amount of text, enclosed in single or double quotes. However, colons should only be used in names for namespace purposes: The message above was generated by the JAXP 1. The output shown here is contained in Echo Another possibility, called mixed content, was illustrated in chapter 2 in the section "Document-Centric vs. Well-formed XML is commonly used but technically redundant. The last step is to configure the parser to tell it which schema language to use. The thing to remember is that your application will not generate a validation exception unless you supply an error handler like the one above. Elements overlap without proper nesting: Being valid implies being well-formed. That declaration specifies the document's DTD. HTML permits attributes that do not require values e. You could also remove the copyright slide, which produces the same result shown below, as reflected in Echo To fix the problem, add the question mark highlighted below to make title an optional element:
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