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RSS, covered in detail in 14, is an XML format for content syndication. The XML_RSS package consists of the XML_RSS class, which simplifies the process of reading and extracting information from RSS feeds. The only dependency of this package is the XML_Parser package. To parse remote feeds, which are typically required when working with RSS, PHP must be allowed to access remote URLs through the allow_url_fopen INI setting. XML_RSS uses the XML_Parser package, which in turn uses the xml extension, so the same rules that apply to the xml extension for processing PHP streams apply to the XML_RSS package. The API is compact and demonstrated further in the next chapter when I explain RDF and RSS.

javax.faces.validator.LengthValidator.MINIMUM=... javax.faces.validator.LengthValidator.MAXIMUM=... javax.faces.validator.DoubleRangeValidator.MINIMUM=... javax.faces.validator.DoubleRangeValidator.MAXIMUM=...

Figure 6-24. The revised New form When you view or edit an existing item, the initial form that includes all the columns will be used, as demonstrated in Figure 6-25.

XML_DTD offers the capabilities to parse DTDs as well as validate documents against these DTDs without needing a validating parser such as DOM. In fact, the only dependency this

package has is the XML_Tree package and its dependencies. The package consists of three classes. XML_DTD_Parser performs the actually parsing of a DTD, which results in an object of the XML_DTD_Tree class. You can use this to extract information from the parsed DTD. The last class, XML_DTD_XmlValidator, validates an XML document against a DTD. This package is still in an alpha release but will work to some degree under PHP 5.

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Caution Whitespaces are not properly ignored when validating a document. Elements that can consist only of child elements will fail to validate if ignorable whitespaces exist between the child elements. When setting the list of acceptable elements, #PCDATA must also be allowable content, or the whitespaces must be removed from the document prior to it being validated. This issue exists with the alpha release 0.4.2 so it may be fixed by the time you read this.

If the user doesn t input anything as the weight, what will the long range validator do Recall the rule regarding validation: if there is no input, you must skip the validation because there is simply no value to validate. JSF does that automatically. In this case, if the user doesn t input the weight, it will be converted to null, and all validation will be skipped. This is no good, because the weight should be mandatory. To fix it, simply mark it as required (see Listing 3-14).

Summary

Depending upon the class being used, the DTD can reside within a file or be contained in a string. In either case, the DTD is handled as an external subset, so it does not consist of a document type declaration. Listing 13-1 contains an example of a DTD that could be used by this package. The subset defined in this listing could be referred to by the file xmldtd.dtd. Listing 13-1. External Subset in xmldtd.dtd <!ELEMENT <!ELEMENT <!ELEMENT <!ELEMENT courses (course+)> course (title, description)> title (#PCDATA)> description (#PCDATA)>

The document in Listing 13-2 comes from 3, which explained document validation. The document, located in the file courses.xml, is considered valid when validated using the DOM extension. Listing 13-2. Courses Document Residing in the File courses.xml <courses> <course> <title>French I</title> <description>Introductory French</description> </course> <course> <title>French II</title> <description>Intermediate French</description> </course> </courses> The XML_DTD_Parser class creates a tree that you can use to inspect the DTD. It has a single method, parse(), that parses the DTD and returns an XML_DTD_Tree object. This method takes one required parameter, which is the DTD to be parsed, and an optional parameter, which indicates whether the first parameter is a file location or a string containing the DTD. The

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