Bonio Lopez wrote:
> Dear all,
> Following build file fails with "
> Expression: SOFTWARE\Microsoft\VisualStudio\${vs_version}\InstallDir
> ^^^^^^^^^^
> Property 'vs_version' has not been set.
> "
>
> But if remove 'xmlns="http://nant.sf.net/schemas/nant.xsd";' then it works
> without problems.
> Why does xmlns changes scope of properties?
>
It doesn't. Here's what's happening:
The xmlns at the top level sets the default namespace for your
default.build file. This gets used implicitly for all of the NAnt
tasks, i.e. when you write <readregistry>, it gets interpreted as if
readregistry is in the 'http://nant.sf.net/schemas/nant.xsd' namespace.
But when you include the settings.inc file, it gets processed according
to XML rules, meaning that the <property> task in settings.inc gets
interpreted as if that occurrence of property is in the '' namespace.
In other words, it uses the default namespace for the settings.inc file,
not the default namespace fo rthe default.build file. NAnt will ignore
elements that aren't in the default namespace for the top level file, so
the <property> in settings.inc is being silently ignored.
The fix is obvious: Add the xmlns="..." string to the <project> element
in settings.inc (and all NAnt files you right, whether top level or
included). This has the additional benefit that if you're using an XML
editor that exploits the namespace for completion (e.g. Visual Studio),
then it will work smoothly in all of the files.
Gary
>
> -----default.build-----
> <project name="SomeName" default="build"
> xmlns="http://nant.sf.net/schemas/nant.xsd";>
> <include buildfile="..\\buid_scripts\\settings.inc" />
>
> <target name="build">
> <readregistry property="__ide.dir"
>
> key="SOFTWARE\Microsoft\VisualStudio\${vs_version}\InstallDir"
> hive="LocalMachine" />
>
> </target>
> </project>
> -----settings.inc-----
> <project>
> <property name="vs_version" value="7.1" overwrite="false"/>
> </project>
>
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