SQL XML :: Handling Namespace In XQuery - Declaring A Namespace - What Is AWMI

After I learned the XML Schemas Collection, Using XML Data and 5 XML data type methods : query(), valuse(), exist(), modify(), and node(), I just started to do XQuery by using the Microsoft XQuery Language Reference - SQL Server 2012 Books Online and Handling Namespaces in XQuery of [URL]. I copied the following code:

-- Handlimng Namespace in Xquery (Page 6 of XQuery Languge Reference & Examples of msdn library)

-- Example A. Declaring a namespace

-- saved as MicrosoftXQueryPage6 in C:DocumentsXquery-SQLServer2012

-- 4 Aug 2015 10:55 AM

SELECT Instructions.query('
declare namespace AWMI="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions";
/AWMI:root/AWMI:Location[1]/AWMI:step
') as Result
FROM Production.ProductModel
WHERE ProductModelID=7

I executed the code in my Microsoft SQL Server 2012 Management Studio (SSMS2012). It worked nicely.

<AWMI:step xmlns:AWMI="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions">
Insert <AWMI:material>aluminum sheet MS-2341</AWMI:material> into the <AWMI:tool>T-85A framing tool</AWMI:tool>.
</AWMI:step>
<AWMI:step xmlns:AWMI="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions">

[code]....

But, I don't know what AWMI means and what the results of SELECT Instructions.query(' declare namespace...  are.