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ELEMENTS OF JSP
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The Tag Library Descriptor (TLD)
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The tag library configuration information needed by a JSP container is stored in a Tag Library Descriptor (TLD) A TLD is an XML document that describes the individual tags in the library, their tag handlers and attributes, as well as version and identifying information about the library as a whole
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TLD Elements
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The document type definition (DTD) for a tag library descriptor can be found at http://javasuncom/j2ee/dtds/Web-jsptaglibrary_1_1dtd A valid TLD consists of a single <taglib> element having certain subelements in a fixed order: I tlibversion is a required element containing the version number of the tag library This is a dotted decimal number consisting of up to four groups of digits separated by decimal points, such as 10 , or 13045
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JSP: The Complete Reference
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I jspversion is an optional element identifying the minimal level of the JSP specification required to support the tag library For example, for JSP version 11, this would be 11 I shortname is a short descriptive name that identifies the tag library A JSP authoring tool might use this name as a default prefix for tags from this library The DTD prescribes this name should have no white space and must begin with an alphabetic character; however, the restriction about white space seems widely ignored in practice shortname is a required element I uri is an optional element that defines a unique URI, which identifies this library This is typically the URL of the location from which the latest version of the taglib can be downloaded I info is an optional element in which descriptive information about the tag library is entered This is intended for human viewing in a JSP authoring tool I tag One or more tag entries can be in a TLD These describe the individual tags that comprise the library A tag element itself consists of up to six types of subelements: I name The tag name as it will be used in a JSP page Together with a namespace prefix that identifies the tag library, the name uniquely identifies a tag to the JSP container I tagclass A required element consisting of the fully qualified name of the tag handler that implements the tag I teiclass An optional element consisting of the fully qualified name of the Tag Extra Information (TEI) class used by this tag, if any A TEI class provides information about scripting variables the tag handler creates, as well as any validations that can be performed on tag attributes I bodycontent Optionally describes how the tag handler uses its body content The possible values are empty JSP tagdependent The tag body must be empty The tag body consists of other JSP elements The tag body is interpreted by the tag itself, with no JSP transformations
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I info
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Optional human-readable descriptive information about the tag
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I attribute Optional information about attributes that can be coded when the tag is used in a JSP page This entry is described more fully in the Defining Tag Attributes section later in this chapter
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11:
JSP Tag Extensions
The taglib Directive
The purpose of the taglib directive is to specify the location of the TLD and assign it a short alias (prefix) that distinguishes its tags on this page Its syntax is as follows:
<%@ taglib prefix="tag prefix" uri="taglibURI" %>
where the two attributes are tag prefix A name, unique on this page, used to identify tags from this library If the prefix is diag, for example, then any tag from this tag library used on this page should be written as <diag:xxx>, where xxx is the tag name The prefix can be any valid XML name token, although Sun Microsystems reserves the prefixes jsp, jspx, java, javax, servlet, sun, and sunw The URI of the tag library itself This can be an absolute path name beginning with / that is interpreted relative to the top of the Web application as in the previous example Or, it can be a URL that acts as a symbolic name for the TLD In this case, the name must be mapped to the actual TLD by means of a <taglib> entry in the Webxml file This approach is discussed in the next section
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