Sun Java Enterprise System Glossary



(adj.) 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.

validating parser

(n.) A parser that ensures that an XML document is valid in addition to being well formed.

value-binding expression

(n.) A JavaServer Faces expression language 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 value attribute, then the component's value is bound to the property. If the component tag refers to the property via its binding attribute then the component itself is bound to the property.

vanity domain

(n.) A domain name associated with an individual user and not with a specific server or hosted domain. A vanity domain is specified by using the MailAlternateAddress attribute. The vanity domain does not have an LDAP entry for the domain name. Vanity domains are useful for individuals or small organizations that desire a customized domain name without the administration overhead of supporting their own hosted domain. Also called custom domain.


(n.) A name often used to refer to Berkeley-style inboxes in which new mail messages are stored sequentially in a single, flat text file.


See dynamic reloading.

virtual data view

(n.) An LDAP representation of a JDBC data source, LDIF data source, or multiple aggregated data sources. A virtual data view is essentially a regular Directory Proxy Server data view on which certain transformation actions have been defined.

virtual domain

(1) (n.) An ISP-hosted domain.

(2) (n.) A domain name added by the Messaging Multiplexor to a client’s user ID for LDAP searching and for logging into a mailbox server. See also domain

virtual host

(n.) Multiple hosts plus domain names mapped to a single IP address.

virtual list view index

(n.) A filtering method which speeds up the display of entries in the Directory Server Console (or other graphical user interface) if the client with the user interface uses the virtual list view extension. Virtual list view indexes can be created on any branch in the directory tree to improve display performance for specific searches. Also known as the browsing index.

virtual private network

(n.) A network with the appearance and functionality of a regular network but which is similar to a private network within a public one. The use of encryption in the lower protocol layers provides a secure connection through an otherwise insecure network, typically the Internet. VPNs are generally cheaper than true private networks using private lines. VPNs rely on having the same encryption system at both ends. The encryption might be performed by firewall software or possibly by routers.

virtual server

(1) (n.) A virtual web server that serves content targeted for a specific URL. Multiple virtual servers can serve content using the same or different host names, port numbers, or IP addresses. The HTTP service can direct incoming web requests to different virtual servers based on the URL. Also known as a virtual host.

(2) (n.) Virtual servers are a way of setting up multiple domain names, IP addresses, and server monitoring capabilities with a single installed server.

virtual server class

(n.) A collection of virtual servers that share the same basic configuration information in a obj.conf file.

virtual transformation

(n.) A definition that determines how physical data is displayed in a Directory Proxy Server virtual data view. A virtual transformation is defined on a data view, in order to obtain a different view of the data.

voice Portal Desktop

(n.) The audio presentation of a Portal Server site as presented by a telephone or similar device.


(n.) A markup language for creating audio dialogues for interactive voice response applications.


(voice over IP) (n.) Technology that provides voice telephony over IP networks.

volume manager

(n.) A software product that provides data reliability through disk striping, concatenation, mirroring, and dynamic growth of metadevices or volumes.


See virtual private network.

VPN gateway

(n.) The entry point to a VPN. Typically protected by a firewall.


(n.) An SMTP command for verifying a user name. Defined in RFC 821.