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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_02) on Thu Nov 13 17:20:35 PST 2003 --><TITLE>Classification (Java 2 Platform Ent. Ed. v1.4)</TITLE><META NAME="keywords" CONTENT="javax.xml.registry.infomodel.Classification interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Classification (Java 2 Platform Ent. 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Ed. v1.4</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../javax/xml/registry/infomodel/AuditableEvent.html" title="interface in javax.xml.registry.infomodel"><B>PREV CLASS</B></A> <A HREF="../../../../javax/xml/registry/infomodel/ClassificationScheme.html" title="interface in javax.xml.registry.infomodel"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="Classification.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.xml.registry.infomodel</FONT><BR>Interface Classification</H2><DL><DT><B>All Superinterfaces:</B> <DD><A HREF="../../../../javax/xml/registry/infomodel/ExtensibleObject.html" title="interface in javax.xml.registry.infomodel">ExtensibleObject</A>, <A HREF="../../../../javax/xml/registry/infomodel/RegistryObject.html" title="interface in javax.xml.registry.infomodel">RegistryObject</A></DD></DL><HR><DL><DT>public interface <B>Classification</B><DT>extends <A HREF="../../../../javax/xml/registry/infomodel/RegistryObject.html" title="interface in javax.xml.registry.infomodel">RegistryObject</A></DL><P>The Classification interface is used to classify RegistryObject instances. A RegistryObject may be classified along multiple dimensions by adding zero or more Classification instances to the RegistryObject. For example, an Organization may be classified by its industry, by the products it sells and by its geographical location. In this example the RegistryObject would have at least three Classification instances added to it. The RegistryObject interface provides several addClassification methods to allow a client to add Classification instances to a Registry Object. <p>Figure 1 shows how a Classification classifies a RegistryObject using a ClassificationScheme. <p> <center> <img SRC="../images/classificationAndRegistryObjectAndScheme.gif" ALT="Using a ClassificationScheme to Classify an Object"> <br><b>Figure 1. Using a ClassificationScheme to Classify an Object</b> </center> <p> <h2>Internal vs. External Taxonomies</h2> A taxonomy may be represented within a JAXR provider in one of the following ways: <ol style='margin-top:0in' start=1 type=a> <li>The taxonomy elements and their structural relationship with each other are available within the JAXR provider. This case is referred to as <i>Internal Taxonomy</i> since the structure of the taxonomy is available internal to the JAXR provider.</li> <li>The taxonomy elements and their structural relationship with each other is represented somewhere external to the JAXR provider. This case is referred to as <i>External Taxonomy</i> since the structure of the taxonomy is not available to the JAXR provider.</li> </ol> <h2>Internal vs. External Classifications</h2> The Classification interface allows the classification of RegistryObjects using a ClassificationScheme whether the ClassificationScheme represents an internal taxonomy or an external taxonomy. When a Classification instance uses a ClassificationScheme representing an internal taxonomy then it is referred to as an internal Classification. When a Classification instance uses a ClassificationScheme representing an external taxonomy then it is referred to as an external Classification. <h2>Internal Classification</h2> <p>When a Classification instance is used to classify a RegistryObject using an internal taxonomy it is referred to as an internal Classification. A client must call the <span style='font-family:"Courier New"'>setConcept</span> method on a Classification and define a reference to a Concept instance from the Classification instance in order for that Classification to use an internal taxonomy. It is not necessary for the client to call setClassificationScheme for internal Classifications since the classifying Concept already knows it root ClassificationScheme.</p> <h3>Example of Internal Classification</h3> Figure 2 shows an example of internal classification using a Concept to represent a taxonomy element. The example classifies an Organization instance as a Book Publisher using the NAICS standard taxonomy available as an internal taxonomy. Note that the figure does not show all the Concepts between the ?Book Publishers? node and the NAICS ClassificationScheme to save space. Had they been there they would have been linked together by the parent attribute of each Concept. <p> <center><img SRC="../images/internalClassificationInstance.gif" ALT="Example of Internal Classification"> <br><b>Figure 2. Example of Internal Classification</b> </center> <h2>External Classification</h2> When a Classification instance is used to classify a RegistryObject using an external taxonomy it is referred to as an external Classification. A client must call the setValue method on a Classification and define a unique value that logically represents a taxonomy element within the taxonomy whose structure is defined externally. It is necessary for the client call setClassificationScheme for external Classifications since there is no other way to infer the ClassificationScheme that represents the external taxonomy. <h3>Example of External Classification</h3> Figure 3 shows an example of external classification. The example uses the same scenario where a Classification classifies an Organization instance as a Book Publisher using the NAICS standard taxonomy. However, this time the structure of the NAICS taxonomy is not available internally to the JAXR provider and consequently there is no Concept instance. Instead, the name and value attributes of the Classification are used to pinpoint the Book Publisher's taxonomy element. Note that name is optional but value is required. <p> <center><img SRC="../images/externalClassificationInstance.gif" ALT="Example of External Classification"> <br><b>Figure 3. Example of External Classification</b> </center> <h2>An Example of Multiple Classifications</h2> The next example shows how a RegistryObject may be classified by multiple classification schemes. In this example, two internal ClassificationSchemes named Industry and Geography are used to classify several Organization RegistryObjects by their industry and Geography. In Figure 4, in order to save space and improve readability, the Classification instances are not explicitly shown but are implied as associations between the RegistryObjects (shaded leaf node) and the associated Concepts. <p> <center><img SRC="../images/classificationTree.gif" ALT="Example of Multiple Classifications"> <br><b>Figure 4. Example of Multiple Classifications</b> </center><P><P><DL><DT><B>Author:</B></DT> <DD>Farrukh S. Najmi</DD><DT><B>See Also:</B><DD><A HREF="../../../../javax/xml/registry/infomodel/RegistryObject.html" title="interface in javax.xml.registry.infomodel"><CODE>RegistryObject</CODE></A>, <A HREF="../../../../javax/xml/registry/infomodel/Concept.html" title="interface in javax.xml.registry.infomodel"><CODE>Concept</CODE></A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor">⌨️ 快捷键说明
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