14. A system for providing autocompletion of a link to a resource in a wiki-editor user interface, comprising: at least one processing unit; at least one memory, including instructions that when executed by the at least one processing unit cause the at least one processing unit to perform a method comprising: receiving text content for a wiki page via the wiki-editor user interface; receiving, via the wiki-editor user interface, an indication that a user desires to link to a resource; receiving a list of a plurality of resource object types available for linking from the wiki page, the resource object types comprising one or more categories of wiki resources and maintained in a registration document further including contact information for a provider associated with each of the resource object types; displaying the list of resource object types; receiving a selection of one of the resource object types; receiving a list of options for the selected resource object type by accessing the registration document, obtaining the contact information for the provider of the selected resource object type, and requesting the list options from the provider, wherein the list of options comprises different resources of the selected resource object type that are available for linking from the wiki page; displaying the list of options for the selected resource object type; receiving first input text; acquiring a filtered list of options that contains only options for the selected resource object type that include the first input text; receiving the filtered list of options; receiving a selection of one of the filtered options; inserting a link to the selected filtered option in the text content.
14. A system for providing autocompletion of a link to a resource in a wiki-editor user interface, comprising: at least one processing unit; at least one memory, including instructions that when executed by the at least one processing unit cause the at least one processing unit to perform a method comprising: receiving text content for a wiki page via the wiki-editor user interface; receiving, via the wiki-editor user interface, an indication that a user desires to link to a resource; receiving a list of a plurality of resource object types available for linking from the wiki page, the resource object types comprising one or more categories of wiki resources and maintained in a registration document further including contact information for a provider associated with each of the resource object types; displaying the list of resource object types; receiving a selection of one of the resource object types; receiving a list of options for the selected resource object type by accessing the registration document, obtaining the contact information for the provider of the selected resource object type, and requesting the list options from the provider, wherein the list of options comprises different resources of the selected resource object type that are available for linking from the wiki page; displaying the list of options for the selected resource object type; receiving first input text; acquiring a filtered list of options that contains only options for the selected resource object type that include the first input text; receiving the filtered list of options; receiving a selection of one of the filtered options; inserting a link to the selected filtered option in the text content. 16. The system of claim 14 , further comprising, after receiving the indication that the user desires to link to the resource: providing a link-text entry area in the wiki-editor user interface; wherein the first input text is received in the link-text entry area, and the list of resource object types, the list of options, and the filtered list of options are displayed in menus within the wiki-editor user interface.