Solved - SQL Server 2012 Semantic Search Example Works Now

If you run the following sample code on BOL (http://technet.microsoft.com/en-us/library/gg492075), you will see some error messages as the sample code is not complete.
SET @Title = 'Sample Document.docx'

SELECT @DocID = DocumentID
   FROM Documents
   WHERE DocumentTitle = @Title

SELECT @Title AS Title, keyphrase, score
   FROM SEMANTICKEYPHRASETABLE(Documents, *, @DocID)
   ORDER BY score DESC
(1) @Title and @DocID are not declared.

(2) The column names DocumentID and DocumentTitle are different from ID and Title in the dbo.Documents table when we attach the sample database
(3) The Document table in the sample database does not have a row for 'Sample Document.docx'
(4) After installing the sample semantic database, we need to enable semantic search on the Documents table and column(s).

(1) Install and configure Semantic Search (http://technet.microsoft.com/en-us/library/gg509085)
(2) Enable Semantic Search on Tables and Columns (http://technet.microsoft.com/en-us/library/gg509116).

(3) Finally,modify the code to perform semantic search.

=============================CODE================================

Use SemanticsDB
GO

--Create a fulltext catalog
CREATE FULLTEXT CATALOG ft AS DEFAULT
GO
/*
1. Verify the columns and contents in the sample 'dbo.Documents' table.
2. We care about 3 columns the most: id, title, and docexcerpt. The last one will have a full-text index on it.
3. Also note there are four titles in the sample table as below:
Columnstore Indices and Batch Processing
Introduction to DataMining
Why Is Bleeding Edge a Different Conference
Additivity of Measures
*/
SELECT * FROM [dbo].[Documents]
/*
1. Create a full-text index for the column(s) for semantic search. In the sample table, that's docexcerpt
2. Notice the PK for the able (PK_Document) is used.
*/

CREATE FULLTEXT INDEX ON [dbo].[Documents]
        (docexcerpt       
            Language 1033      
            Statistical_Semantics
)
KEY INDEX PK_Documents
WITH STOPLIST = SYSTEM
GO
--Now we can perform semantic search on the docexcerpt column.
DECLARE @Title varchar(50)
DECLARE @DocID varchar(50)
SET @Title = 'Introduction to Data Mining' --notice:this is one entry in the table, also no .docx
SELECT @DocID = ID --Note: not DocumentID as in the sample code

FROM dbo.Documents
WHERE Title = @Title --Note: not DocumentTitle as in the sample code
SELECT @Title AS Title, keyphrase, score
FROM SEMANTICKEYPHRASETABLE(dbo.Documents,*, @DocID)
ORDER BY score DESC

--The output is as below:
/*
Title                                                                    keyphrase              score
===================================================
Introduction to Data Mining                               necessity           0.3286656
Introduction to Data Mining                               anymore            0.2987682
Introduction to Data Mining                               mining                0.2788366
Introduction to Data Mining                               rare              0.2755147
Introduction to Data Mining                               becoming          0.262227
Introduction to Data Mining                               advantage         0.2589051
Introduction to Data Mining                               data                    0.2256858
Introduction to Data Mining                               using                  0.2256858
Introduction to Data Mining                               every                  0.2057543
Introduction to Data Mining                               companies        0.1991104
Introduction to Data Mining                               company            0.1758569
Introduction to Data Mining                               not                      0.1293499
*/