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- A valid XML document, in addition to being well formed, conforms to all the constraints imposed by a DTD. It does not contain any tags that are not permitted by the DTD, and the order of the tags conforms to the DTD's specifications.
- Browse Related Terms: comment, content, DDP, Error, fatal error, JSP document, prolog, SAX, Schema, Simple API for XML, valid, validating parser, Warning, well-formed, XLink, XPath, XPointer
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- A parser that ensures that an XML document is valid in addition to being well formed. See also parser.
- Browse Related Terms: comment, content, DDP, Error, fatal error, JSP document, prolog, SAX, Schema, Simple API for XML, valid, validating parser, Warning, well-formed, XLink, XPath, XPointer
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- A JavaServer Faces EL expression that refers to a property of a backing bean. A component tag uses this expression to bind the associated component's value or the component instance to the bean property. If the component tag refers to the property via its
valueattribute, then the component's value is bound to the property. If the component tag refers to the property via itsbindingattribute then the component itself is bound to the property. - Browse Related Terms: backing bean, binding (JavaServer Faces technology), JavaBeans component, JavaServer Faces event and listener model, JavaServer Faces expression language, JavaServer Faces UI component class, JSP expression language, method-binding expression, value-binding expression
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An item of data named by an identifier. Each variable has a type, such as
intorObject, and a scope. See also class variable, instance variable, local variable.- Browse Related Terms: Attribute, class constant, class variable, constant, encapsulation, instance variable, local variable, magic number, method variable, model-view pattern, out of scope, overloading, static field, static variable, this, variable
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The association of a variable with a particular type. It is important to make a distinction between the declaration of variables of primitive types and those of class types. A variable of primitive type acts as a container for a single value of its declared type. Declaration of a variable of a class type does not automatically cause an object of that type to be constructed and, by default, the variable will contain the value
null. A variable of a class type acts as a holder for a reference to an object that is compatible with the variable's class type. Java's rules of polymorphism allow a variable of a class type to hold a reference to any object of its declared type or any of its sub types. A variable with a declared type ofObject, therefore, may hold a reference to an object of any class, therefore.- Browse Related Terms: aliases, functional programming, imperative programming, null reference, object reference, polymorphism, reference, static type, variable declaration
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The name used to describe a user's graphical working area within a window manager. The name arose in the early days of graphical user interfaces when it was thought that these would lead to `paperless offices'. It was anticipated that the computer screen would become a user's desktop, in which virtual documents, as opposed to paper documents, would be created, read and manipulated in various ways.
- Browse Related Terms: AWT (Abstract Windowing Toolkit), cursor, GUI, GUI (Graphical User Interface), Java Foundation Classes (JFC), look-and-feel, popup menu, Property, Swing, virtual desktop, window manager
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Multiple hosts plus domain names mapped to a single IP address.
- Browse Related Terms: hostname, JSP container, JSP container, distributed, Security Policy, servlet container, distributed, virtual host, Web application, distributable, Web container, distributed, Web server
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An abstract specification for a computing device that can be implemented in different ways, in software or hardware. You compile to the instruction set of a virtual machine much like you'd compile to the instruction set of a microprocessor. The Java virtual machine consists of a bytecode instruction set, a set of registers, a stack, a garbage-collected heap, and an area for storing methods.
- Browse Related Terms: big-endian, CVM (Compact Virtual Machine), JVM, KVM (Kilobyte Virtual Machine), little-endian, scheduler, Thread, virtual machine
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A computer will have a limited amount of real memory available to it. Programs often require more memory than the amount of real memory. Furthermore, in a multiprogramming system, different processes will be competing for the same limited supply of real memory. An operating system overcomes these conflicts by allocating an amount of virtual memory to each process, which might be larger than the total amount of real memory. This is possible by storing unused parts of a process's address space on disk, until such time as it is required. When required, it is swapped in to part of the real memory, whose previous contents are swapped out to disk.
- Browse Related Terms: address space, archiving, compositing, deployment, distributed, double buffering, host system, interprocess communication, micro-chip, normalization, North American Industry Classification System (NAICS), object serialization, preverification, Random Access Memory, timesharing system, virtual memory
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The Visitor Location Register (VLR) is a database that contains temporary information about subscribers.
- Browse Related Terms: Delegation, destination, durable subscription, HLR (Home Location Register), impersonation, publish/subscribe messaging system, topic, VLR (Visitor Location Register)
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A Java keyword used in method declarations to specify that the method does not return any value.
voidcan also be used as a nonfunctional statement.- Browse Related Terms: array initializer, carriage return, cascading if-else statement, method result, return statement, return value, statement terminator, try clause, Void
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A Java keyword used in variable declarations that specifies that the variable is modified asynchronously by concurrently running threads.
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