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Consider a back-end data store that contains the fields and field properties described in the following table.
Name |
Number |
Data Type |
Max Length |
---|---|---|---|
name |
1 |
string |
10 |
bin |
2 |
bin.hex |
8 |
GUID |
3 |
uuid |
16 |
date |
4 |
dateTime |
16 |
float |
6 |
float |
8 |
flag |
7 |
boolean |
2 |
There are two rows, and the data contained in their fields is shown in the following table.
name |
bin |
GUID |
date |
float |
flag |
---|---|---|---|---|---|
sample1 |
00000000499602d2 |
{8AC68D3D-8A09-4403-8860-D0E494BBE894} |
2008-01-25T13:04:00Z |
3.1415926535897932 |
0 |
sample2 |
null |
null |
2008-02-13T18:49:00Z |
null |
1 |
The preceding schema and data can be represented by using the ADO XML Persistence Format as follows:
-
<xml xmlns:s='uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882' xmlns:dt='uuid:C2F41010-65B3-11d1-A29F-00AA00C14882' xmlns:rs='urn:schemas-microsoft-com:rowset' xmlns:z='#RowsetSchema'> <s:Schema id='RowsetSchema'> <s:ElementType name='row' content='eltOnly' rs:CommandTimeout='30'> <s:AttributeType name='name' rs:number='1' > <s:datatype dt:type='string' dt:maxLength='10' /> </s:AttributeType> <s:AttributeType name='bin' rs:number='2' > <s:datatype dt:type='bin.hex' dt:maxLength='8' /> </s:AttributeType> <s:AttributeType name='GUID' rs:number='3'> <s:datatype dt:type='uuid' dt:maxLength='16' /> </s:AttributeType> <s:AttributeType name='date' rs:number='4' > <s:datatype dt:type='dateTime' dt:maxLength='16' rs:scale='0' rs:precision='16' /> </s:AttributeType> <s:AttributeType name='float' rs:number='6' > <s:datatype dt:type='float' dt:maxLength='8' rs:precision='17' /> </s:AttributeType> <s:AttributeType name='flag' rs:number='7' > <s:datatype dt:type='boolean' dt:maxLength='2' /> </s:AttributeType> </s:ElementType> </s:Schema> <rs:data> <z:row name='sample1' bin='00000000499602d2' GUID='{8AC68D3D-8A09-4403-8860-D0E494BBE894}' date='2008-01-25T13:04:00Z' float='3.1415926535800001' flag='0'/> <z:row name='sample2' date='2008-02-13T18:49:00Z' flag='1'/> </rs:data> </xml>
The absence of an attribute, defined in RowsetSchema,
in z:row element means that the field has a null value. For example, the
data row with name="sample2"
has null
values of fields "bin", "GUID", and "float".