Yes a Property element can be under a Fragment or under a Product (or several
other possibilities). Look at the schema in the chm.
If you put it in a Fragment (whether in the same wxs as your Product or a
different wxs) your Product, generally speaking, needs to have some
'reference' to something in the Fragment, and then everything in the
Fragment is pulled into the compilation. So when I define a property in a
fragment like this:
in my commonProperties.wxs file I have:
<Fragment>
<Property Id='SOMEPROPERTY' Secure="yes" Admin="yes"/>
<Property Id="PRE.SOMEPROPERTY">
<RegistrySearch Id='FindSOMEPROPERTY' Root='HKLM'
Key='$(var.PropertiesRegKey)' Name='SOMEPROPERTY' Type='raw'/>
</Property>
<SetProperty Id='SOMEPROPERTY' Value='[PRE.SOMEPROPERTY]'
After='AppSearch'>NOT (SOMEPROPERTY)</SetProperty>
</Fragment>
in the wxs which has my Product element add:
<PropertyRef Id="SOMEPROPERTY"/>
<Feature .....>
<CompoentGroupRef Id="project_RememberProperties"/>
</Feature>
Everything in the above Fragment is now part of this project. My
commonProperties.wxs file may have other Fragments, but they are not used in
the project unless I add a reference.
You can read more here, and notice that the above is missing the code that
sets the registry key (which is also defined in a wxi file).
http://robmensching.com/blog/posts/2010/5/2/the-wix-toolsets-remember-property-pattern
http://www.nichesoftware.co.nz/node/633
I put that code in another wxs and use a ComponentGroupRef (or a
ComponentRef) to pull that in the Product element.
<Fragment>
<ComponentGroup Id="project_RememberProperties"
Directory="$(var.PropertiesDir)">
<Component Id="regSOMEPROPERTY" Guid="guid">
<RegistryValue Root="HKMU" Key="$(var.PropertiesRegKey)"
Name="SOMEPROPERTY Value="[SOMEPROPERTY]" Type="string" KeyPath="yes" />
</Component>
...more components
</ComponentGroup>
</Fragment>
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