Use CSOM to create a Site column of type "enterprise keyword"

Question

I have successfully created site columns using CSOM.
When I look at the available types of site columns I can see
http://office.microsoft.com/en-us/sharepoint-server-help/site-column-types-and-options-HA010302196.aspx
But there is nothing similar to what you can do when you go into list settings and say "Add an enterprise keywords column and enable keyword synchronization"
What is the data type for the enterprise keywords column? why should it be directly added into the list via the UI... but not via a site column?
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Answer 1

Hi,
The following code(Client Object Model) for your reference:
static void Main(string[] args)
string siteURL = "http://siteurl";
ClientContext context = new ClientContext(siteURL);
//specific user
NetworkCredential credentials = new NetworkCredential("username", "password", "domain");
context.Credentials = credentials;
FieldCollection fields = context.Web.Fields;
Field field = fields.GetByTitle("Enterprise Keywords");
context.Load(field);
context.ExecuteQuery();
//field schema xml
string fieldSchema=field.SchemaXml;
//update the schema of Enterprise Keywords field
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(fieldSchema);
XmlNode node=xmlDoc.SelectSingleNode("Field");
XmlElement Xe = (XmlElement)node;
Guid fieldID = Guid.NewGuid();
Xe.SetAttribute("DisplayName", "Enterprise Keywords1");
Xe.SetAttribute("StaticName", "TaxKeyword1");
Xe.SetAttribute("Name", "TaxKeyword1");
Xe.SetAttribute("ID", "{" + fieldID + "}");
fieldSchema = xmlDoc.InnerXml;
//add this field to the field collection
fields.AddFieldAsXml(fieldSchema, false, AddFieldOptions.DefaultValue);
context.ExecuteQuery();
Thanks,
Dennis Guo
TechNet Community Support
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Dennis Guo
TechNet Community Support