Database.com Metadata API Developer's Guide - Salesforce.com

Metadata TypesWeblinkDeclarative Metadata Sample DefinitionA sample XML definition of a validation rule in a custom object is shown below.DeployedMommy_Cat__cMommy CatCat__cCatsLookupCatCat NameTextCatsReadWriteCatsRuletrueOR(Name = 'Milo',Name ='Moop')Name must be that of one of my catsWeblinkRepresents a Weblink defined in a custom object. It extends the Metadata metadata type and inherits its fullName field.VersionWeblinks are available in API version 12.0 and later.FieldsThe Weblink definition contains the following fields.Field NameavailabilitydescriptiondisplayTypeencodingKeyField TypeWebLinkAvailability(enumeration of type string)stringWebLinkDisplayType(enumeration of type string)Encoding (enumeration oftype string)DescriptionRequired. Indicates whether the Weblink is only available online(online, or if it is also available offline (offline).A description of the Weblink.Represents how this Weblink is rendered.Valid values:• link for a hyperlink• button for a button• massAction for a button attached to a related listRequired. The default encoding setting is Unicode: UTF-8. Changethe default encoding setting if the target of a link requires data in adifferent format. This is available if your Content Source is URL.Valid values include:104