Selecting specific nodes in an XML file from multiple levels

Question

I have an xml file in a format similar to this:

<benchmark>
<group>
    <id>1</id>
    <rule>
        <id>H1234</id>
        <severity>High</severity>
    </rule>
    <title>How to win</title>
</group>
<group>
    <id>2</id>
    <rule>
        <id>5317</id>
        <severity>low</severity>
    </rule>
    <title>How to not</title>
</group>
<group>
    <id>3</id>
    <rule>
        <id>H15678</id>
        <severity>medium</severity>
    </rule>
    <title>How to be</title>
</group>
<group>
    <id>4</id>
    <rule>
        <id>H454</id>
        <severity>High</severity>
    </rule>
    <title>How to lose</title>
</group></benchmark>

I would like to be able to select the group/id, group/rule/id, group/rule/severity and group/title values from each group in the xml docoument.

I have tried this but it only gets me part of the way there:

I have tried $xml.benchmark.group | %{$_} | select title, id

I appreciate your help!

Answer 1

This works for me:

$xml.benchmark.group |
select @{ L = 'GroupID';      E = { $_.id } },
       @{ L = 'GroupTitle';   E = { $_.title } },
       @{ L = 'RuleID';       E = { $_.rule.id } },
       @{ L = 'RuleSeverity'; E = { $_.rule.severity } }

yielding the following:

GroupID GroupTitle  RuleID RuleSeverity
------- ----------  ------ ------------
1       How to win  H1234  High
2       How to not  5317   low
3       How to be   H15678 medium
4       How to lose H454   High

The syntax above is similar to SQL's SELECT Foo AS Bar, selecting a value (Expression or E in the hashtable) and providing an alias for display purposes (Label or L in the hashtable).