Query language for XML that is going to remove use of database

Friends,
I want to know whether my idea is feasible or not.
I want to make a query language similar to SQL for XML which is going to remove the need for database for a large extent.
Their will be queries for making table,extracting data,making foreign key all through XML and no database.
I just want to know that is their any market value for such a project and will it be sellable,so that i can start working on it.

There is no way to judge any future market for such a thing.
As it is, XML is widely abused, having mutated from its original purpose, a markup language readable by both machine and human, to a general data interchange language. It winds up being extremely slow and convoluted, in some cases overwhelming the hardware when a simple and common error occurs, then having to catch up. A big part of this is the silly and redundant method of defining metadata, again and again and again and again.
So what you want to do is create a database which will be highly formatted with redundant information, dynamically. This is silly, why does data need to be stored in a human readable format? It doesn't always even need to be presented in a human readable format! Why the heck would you need to read the bits of an mp4? Steganography?
What you are proposing is the exact opposite of what is needed. What is needed is a way to describe metadata for many different kinds of data, in a manner that can be interpreted by both man and machine at appropriate times, extensible for various paradigms.
What can be sold, on the other hand, is another question entirely, and not technical at all.
First definition of database that pops up during a search: an organized body of related information
Why would you want to get rid of that?

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stuff(
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fielda
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xml path (''),
type).value
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,1,2,
anotherfield
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Test conditions were as follows:
AdventureWorks2012 database
On average, the non-typed version executed in ~190 ms and the typed version executes in ~405 ms.
Test bed was the following:
@@VERSION =
Microsoft SQL Server 2012 - 11.0.2218.0 (X64)
Jun 12 2012 13:05:25
Copyright (c) Microsoft Corporation
Developer Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )
Hardware =
Processor: Core i7-4770K @ 3.50GHz (4 physical cores / 8 logical cores)
Ram: 16.0 GB @ 2400 MHz
HD: SSD
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-- Typed version --
DECLARE @BegDT DATETIME2(7) = SYSDATETIME()
SELECT
sod1.SalesOrderID,
STUFF((
SELECT ', ' + CAST(sod2.ProductID AS VARCHAR(8))
FROM Sales.SalesOrderDetail sod2
WHERE sod1.SalesOrderID = sod2.SalesOrderID
FOR XML PATH(''), TYPE).value('.', 'varchar(max)'), 1, 2, '') AS csv
FROM
Sales.SalesOrderDetail sod1
GROUP BY
sod1.SalesOrderID
SELECT DATEDIFF(ms, @BegDT, SYSDATETIME()) AS ExecTimeMS
-- Non-typed version --
DECLARE @BegDT DATETIME2(7) = SYSDATETIME()
SELECT
sod1.SalesOrderID,
STUFF((
SELECT ', ' + CAST(sod2.ProductID AS VARCHAR(8))
FROM Sales.SalesOrderDetail sod2
WHERE sod1.SalesOrderID = sod2.SalesOrderID
FOR XML PATH('')), 1, 2, '') AS csv
FROM
Sales.SalesOrderDetail sod1
GROUP BY
sod1.SalesOrderID
SELECT DATEDIFF(ms, @BegDT, SYSDATETIME()) AS ExecTimeMS
If you see holes in my test approach, please let me know.
Thanks,
Jason
Jason Long

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This data is present in clob i need to extract the below mentioned field.
expected query is
select
extractvalue( xmltype(table1.column1), '/UserProfileSnapshot/UserInfo/Attribute[@name="Users.Display Name"]' )
from table1
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<Attribute name="Users.Status">Active</Attribute>
<Attribute name="USR_UDF_LOCATION_ID">1737</Attribute>
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<Attribute name="Hire Date">2013-02-28 00:00:00 -0500</Attribute>
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<Attribute name="Street">500 Madison Ave</Attribute>
<Attribute name="Users.User ID">31967</Attribute>
<Attribute name="USR_UDF_CITY">New York</Attribute>
<Attribute name="Users.Lock User">0</Attribute>
<Attribute name="Users.Updated By Login" key="4">OIMINTERNAL</Attribute>
<Attribute name="Users.Created By Login" key="4">OIMINTERNAL</Attribute>
<Attribute name="Users.Login Attempts Counter">0</Attribute>
<Attribute name="Organizations.Organization Name" key="4">Integra</Attribute>
</UserInfo>
</UserProfileSnapshot>"

As said in {thread:id=2545133}, the quotes are certainly not the issue.
This works fine for me on 11.2.0.2 :
SQL> insert into table1 (column1)
2 values (
3 '<?xml version = ''1.0'' encoding = ''UTF-8''?>
4 <UserProfileSnapshot key="224" version="1.0">
5 <UserInfo>
6 <Attribute name="Users.Display Name">testfuturedate102, Mr. user</Attribute>
7 <Attribute name="USR_UDF_HR_ORG_ID">202</Attribute>
8 <Attribute name="Users.Xellerate Type">End-User</Attribute>
9 <Attribute name="Users.Role">Employee</Attribute>
10 <Attribute name="Users.First Name">user</Attribute>
11 <Attribute name="Users.Status">Active</Attribute>
12 <Attribute name="USR_UDF_LOCATION_ID">1737</Attribute>
13 <Attribute name="Users.Provisioned Date">2013-04-23 10:04:48 -0400</Attribute>
14 <Attribute name="Title">MR.</Attribute>
15 <Attribute name="USR_UDF_LOCATION_CODE">HR- New York</Attribute>
16 <Attribute name="Country">US</Attribute>
17 <Attribute name="State">NY</Attribute>
18 <Attribute name="Users.Password Reset Attempts Counter">0</Attribute>
19 <Attribute name="Users.Disable User">0</Attribute>
20 <Attribute name="Users.Change Password At Next Logon">1</Attribute>
21 <Attribute name="USR_CN_GENERATED">0</Attribute>
22 <Attribute name="USR_UDF_EFFECTIVE_START_DATE">2013-03-08 00:00:00 -0500</Attribute>
23 <Attribute name="Postal Code">10001</Attribute>
24 <Attribute name="Users.Update Date">2013-04-23 10:04:48 -0400</Attribute>
25 <Attribute name="Employee Number">2335</Attribute>
26 <Attribute name="USR_UDF_DEPARTMENT_NAME">Vision Corporation</Attribute>
27 <Attribute name="Users.Last Name">testfuturedate102</Attribute>
28 <Attribute name="Users.End Date">4712-12-31 00:00:00 -0500</Attribute>
29 <Attribute name="Hire Date">2013-02-28 00:00:00 -0500</Attribute>
30 <Attribute name="USR_UDF_PERSON_ID">31967</Attribute>
31 <Attribute name="USR_UDF_IS_MANAGER">N</Attribute>
32 <Attribute name="Users.Creation Date">2013-04-23 10:04:48 -0400</Attribute>
33 <Attribute name="Street">500 Madison Ave</Attribute>
34 <Attribute name="Users.User ID">31967</Attribute>
35 <Attribute name="USR_UDF_CITY">New York</Attribute>
36 <Attribute name="Users.Lock User">0</Attribute>
37 <Attribute name="Users.Updated By Login" key="4">OIMINTERNAL</Attribute>
38 <Attribute name="Users.Created By Login" key="4">OIMINTERNAL</Attribute>
39 <Attribute name="Users.Login Attempts Counter">0</Attribute>
40 <Attribute name="Organizations.Organization Name" key="4">Integra</Attribute>
41 </UserInfo>
42 </UserProfileSnapshot>'
43 );
1 row inserted
SQL>
SQL> select x.*
2 from table1 t
3     , xmltable(
4         '/UserProfileSnapshot/UserInfo'
5         passing xmltype(t.column1)
6         columns userdisplay_name varchar2(30) path 'Attribute[@name="Users.Display Name"]'
7               , user_role        varchar2(30) path 'Attribute[@name="Users.Role"]'
8       ) x ;
USERDISPLAY_NAME               USER_ROLE
testfuturedate102, Mr. user    Employee

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null

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