Applies a Tag to an object by a given user in a specified language. If the tag text does not already exist, it is created. The newly created ID is accessible via the returned TagData. 

This method can be accessed through the Tags.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/Tags.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "AddTagToObject with user and language", Description = "Applies a Tag to a piece of content.  If the tag text does not already exist, it is created.  The newly created Id is accessible via the returned TagData.")]
public TagData AddTagToObject(string tagText, long objectId, EkEnumeration.CMSObjectTypes objectType, long userId, int languageId);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "AddTagToObject with user and language", Description = "Applies a Tag to a piece of content.  If the tag text does not already exist, it is created.  The newly created Id is accessible via the returned TagData.")>
Public Function AddTagToObject(tagText As string, objectId As long, objectType As EkEnumeration.CMSObjectTypes, userId As long, languageId As Integer) As TagData