Matching and return specific XML nodes - sql-server-2008

Question

I need to return all XML nodes whose ID attributes match between <Settings></Settings> and <Profile></Profile> and whose <Setting/> node has a Value attribute of true.
An example of my XML structure is found below:
<HBDI>
<Settings>
<Setting ID="PreferenceCode" Visible="true"/>
<Setting ID="SequenceCode" Visible="true"/>
<Setting ID="QuadrantScores" Visible="false"/>
<Setting ID="AdjectivePairs" Visible="false"/>
<Setting ID="ModeScores" Visible="true"/>
<Setting ID="Graph" Visible="true"/>
</Settings>
<Profile>
<PreferenceCode ID="PreferenceCode">3332</PreferenceCode>
<SequenceCode ID="SequenceCode">DCAB</SequenceCode>
<Graph ID="Graph">Graph.jpg</Graph>
<QuadrantScores ID="QuadrantScores">
<QuadrantScore Name="A" Value="3" />
<QuadrantScore Name="B" Value="3" />
<QuadrantScore Name="C" Value="23" />
<QuadrantScore Name="D" Value="46" />
</QuadrantScores>
<AdjectivePairs ID="AdjectivePairs">
<AdjectivePair Name="A" Value="4" />
<AdjectivePair Name="B" Value="7" />
<AdjectivePair Name="C" Value="9" />
<AdjectivePair Name="D" Value="10" />
</AdjectivePairs>
<ModeScores ID="ModeScores">
<ModeScore Name="Lt" Value="34" />
<ModeScore Name="Rt" Value="54" />
<ModeScore Name="Upr" Value="3" />
<ModeScore Name="Lwr" Value="24" />
</ModeScores>
</Profile>
</HBDI>
So what I want to achieve is to retrieve the following xml:
<HBDI>
<PreferenceCode ID="PreferenceCode">3332</PreferenceCode>
<SequenceCode ID="SequenceCode">DCAB</SequenceCode>
<Graph ID="Graph">Graph.jpg</Graph>
<ModeScores ID="ModeScores">
<ModeScore Name="Lt" Value="34" />
<ModeScore Name="Rt" Value="54" />
<ModeScore Name="Upr" Value="3" />
<ModeScore Name="Lwr" Value="24" />
</ModeScores>
</HBDI>
So, in the case of ID="PreferenceCode", it's corresponding Visible attribute in <Settings/> is true, thus it needs to be returned. I must admit that I have no idea on how to do the match-up between the IDs. Any help please?

Answer 1

When you are dealing with XML, use XQuery:
DECLARE #MyXML xml = '
<HBDI>
<Settings>
<Setting ID="PreferenceCode" Visible="true"/>
<Setting ID="SequenceCode" Visible="true"/>
<Setting ID="QuadrantScores" Visible="false"/>
<Setting ID="AdjectivePairs" Visible="false"/>
<Setting ID="ModeScores" Visible="true"/>
<Setting ID="Graph" Visible="true"/>
</Settings>
<Profile>
<PreferenceCode ID="PreferenceCode">3332</PreferenceCode>
<SequenceCode ID="SequenceCode">DCAB</SequenceCode>
<Graph ID="Graph">Graph.jpg</Graph>
<QuadrantScores ID="QuadrantScores">
<QuadrantScore Name="A" Value="3" />
<QuadrantScore Name="B" Value="3" />
<QuadrantScore Name="C" Value="23" />
<QuadrantScore Name="D" Value="46" />
</QuadrantScores>
<AdjectivePairs ID="AdjectivePairs">
<AdjectivePair Name="A" Value="4" />
<AdjectivePair Name="B" Value="7" />
<AdjectivePair Name="C" Value="9" />
<AdjectivePair Name="D" Value="10" />
</AdjectivePairs>
<ModeScores ID="ModeScores">
<ModeScore Name="Lt" Value="34" />
<ModeScore Name="Rt" Value="54" />
<ModeScore Name="Upr" Value="3" />
<ModeScore Name="Lwr" Value="24" />
</ModeScores>
</Profile>
</HBDI>'
SELECT #MyXML.query('
<HDBI> {
let $settings := /HBDI/Settings
for $element in /HBDI/Profile/*
where $settings/Setting[#ID = local-name($element) and #Visible = "true"]
return $element
} </HDBI>
')
The XQuery loops through each child node of the <Profile> tag and check if it's set to #Visible = "true" in the <Settings> node. local-name() gives the name of the current node.