xml - WiX Installer failed to parse condition -

xml - WiX Installer failed to parse condition -

i trying create wix installer makes sure user on windows 7 , doesn't have .net framework 4.5 installed. below both error code , xml/wxs code in bundle. i'm @ loss why doesn't understand unless parentheses. but, without them doesn't understand not is.

code:

<chain> <exepackage id="prepackage" sourcefile="dotnetfx45_full_setup.exe" installcondition="(versionnt &gt;= v6.1) , not (net4fullversion &gt;= 4.5)" /> <msipackage id="mainpackage" sourcefile="samplefirst.msi" installcondition="versionnt &gt;= v6.1" /> </chain>

error:

[0a20:0954][2014-06-23t12:07:14]e000: error 0x8007000d: failed parse status "(versionnt >= v6.1) , not (net4fullversion >= 4.5)". unexpected character @ position 49.

having experimented locally, looks net4fullversion needs have version number quoted; means in case quotes have escaped:

<exepackage id="prepackage" sourcefile="dotnetfx45_full_setup.exe" installcondition="(versionnt >= v6.1) , not (net4fullversion >= &quot;4.5&quot;)" />

xml parsing wix condition