[xwiki-devs] about documentation of adding a tag to a page via REST API

Dear all, I am trying to add a tag/tags to a page. However, it seems to me that there is an inconsistency between XWiki REST API document and its implementation. http://platform.xwiki.org/xwiki/bin/view/Features/XWikiRESTfulAPI#HTagresour... The document indicates that PUT method can take <tag> element and will add a tag. However, the implementation only takes <tags> element (via xml/application) and PUT method replaces all the existing tags with the new tags included in the <tags> element. Is there a REST call that only adds a tag to the page without replacing all the existing ones? Best regards Jun Han