struggling with XML namespace nodes query - sql-server

Question

I'm struggling to get my head around XML namespace query when using XML nodes - I've read other similar questions here and an article here but cannot apply this to my specific query.
I have a larger version of this sample XML:
SELECT CAST('<Navigator clsid="{ABF8EB05-610D-11D3-A53E-684F745C}">
<Version>7</Version>
<NavigatorNodes clsid="{0484ACB1-78F5-48D7-A26B-3A0ACD3A5F91}">
<NavigatorNode clsid="{59AB61BD-7833-4954-94C2-B6D737E3DD6F}">
<Indent>0</Indent>
<Caption>Contact</Caption>
<Selected>0</Selected>
<ViewType>0</ViewType>
<ViewSubType>0</ViewSubType>
<ShowTotals>0</ShowTotals>
<RowHeight>0</RowHeight>
<Complement>0</Complement>
<FreezeFirst>0</FreezeFirst>
<a1:QueryFilter xmlns:a2="http://www.ascenttechnology.co.uk/schemas/entities" xmlns:xsi="http://www.w3.org/21/XMLSchema-instance" xmlns:a1="http://www.ascenttechnology.co.uk/schemas/services" Type="QueryFilter">
<entity_name>Contact</entity_name>
<relationship_name />
<relationship_from_entity_name />
<a1:ColumnInfoCollection Type="ColumnInfoCollection" AscentCollection="true">
<__vers>1</__vers>
<IgnoreMissingItem>0</IgnoreMissingItem>
<ReadOnly>0</ReadOnly>
<AllowNulls>0</AllowNulls>
<a1:ColumnInfo Type="ColumnInfo">
<attribute_name>state</attribute_name>
<width>0</width>
</a1:ColumnInfo>
<a1:ColumnInfo Type="ColumnInfo">
<attribute_name>current_address_suffix</attribute_name>
<width>0</width>
</a1:ColumnInfo>
</a1:ColumnInfoCollection>
<a1:SurveyColumnInfoCollection Type="AttributeInfoCollection" AscentCollection="true">
<__vers>1</__vers>
<IgnoreMissingItem>0</IgnoreMissingItem>
<ReadOnly>0</ReadOnly>
<AllowNulls>0</AllowNulls>
</a1:SurveyColumnInfoCollection>
<a1:WorkflowColumnInfoCollection Type="AttributeInfoCollection" AscentCollection="true">
<__vers>1</__vers>
<IgnoreMissingItem>0</IgnoreMissingItem>
<ReadOnly>0</ReadOnly>
<AllowNulls>0</AllowNulls>
</a1:WorkflowColumnInfoCollection>
<a1:ConditionCollection Type="ConditionCollection" AscentCollection="true">
<__vers>1</__vers>
<IgnoreMissingItem>0</IgnoreMissingItem>
<ReadOnly>0</ReadOnly>
<AllowNulls>0</AllowNulls>
<a1:Condition Type="Condition">
<attribute_name>class</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>28</operator>
<value1>1</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>do_not_mail</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1>True</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>gone_away</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1>True</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>dp_opt_out</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1>True</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>deceased</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1>True</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>deleted</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1>True</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>Date_Of_Birth</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>19</operator>
<value1>2010-06-23T::.+:</value1>
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>home_address1</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>26</operator>
<value1 xsi:nil="true" />
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>home_postcode</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>26</operator>
<value1 xsi:nil="true" />
<value2 xsi:nil="true" />
<indent_level>1</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>home_address1</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1 />
<value2 xsi:nil="true" />
<indent_level>0</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
<a1:Condition Type="Condition">
<attribute_name>home_postcode</attribute_name>
<description1 />
<description2 />
<attribute_id>0</attribute_id>
<not>0</not>
<operator>0</operator>
<value1 />
<value2 xsi:nil="true" />
<indent_level>1</indent_level>
<value1_is_reference>0</value1_is_reference>
<value2_is_reference>0</value2_is_reference>
</a1:Condition>
</a1:ConditionCollection>
<a1:OrderByCollection Type="OrderByCollection" AscentCollection="true">
<__vers>1</__vers>
<IgnoreMissingItem>0</IgnoreMissingItem>
<ReadOnly>0</ReadOnly>
<AllowNulls>0</AllowNulls>
</a1:OrderByCollection>
<SelectedArticles xsi:nil="true" />
<groupby_field_name />
<reporting_currency>52</reporting_currency>
<Negate_Filter>0</Negate_Filter>
<Survey_Id>----</Survey_Id>
<Survey_Name xsi:nil="true" />
<Workflow_Id>----</Workflow_Id>
<Workflow_Name xsi:nil="true" />
<XPath>0</XPath>
<locale>0</locale>
</a1:QueryFilter>
</NavigatorNode>
</NavigatorNodes>
</Navigator>' AS XML) as xmldata
And have been trying queries to get to the information contained within the a1:Condition Node. I've tried queries such as:
;WITH XMLNAMESPACES(
'http://www.ascenttechnology.co.uk/schemas/services' AS a1
,'http://www.ascenttechnology.co.uk/schemas/entities' AS a2
,DEFAULT 'http://www.w3.org/21/XMLSchema-instance'
)
SELECT
#xmldata.*
,ref.value('attribute_name[1]','NVARCHAR(50)') as attribute_name
FROM #xmldata
CROSS APPLY xmldata.nodes('/Navigator/NavigatorNodes/NavigatorNode/a1:QueryFilter/a1:ConditionCollection/a1:Condition') T(ref)
But they're always coming back blank when I get near the namespaced nodes - I'm able to pull data from the nodes all the way up to '/Navigator/NavigatorNodes/NavigatorNode' but then have no luck.
Thanks!

Answer 1

You declare DEFAULT 'http://www.w3.org/21/XMLSchema-instance' but your XML string does even not have a default namespace.
Try
WITH XMLNAMESPACES(
'http://www.ascenttechnology.co.uk/schemas/services' AS a1
, 'http://www.ascenttechnology.co.uk/schemas/entities' AS a2
)