for example run the code for this line of xml:
<void property="container"> and also for this line
<void property="assetscontainer">

but for example not for this line:
<void property="string">

<xsl:when test="name(.)='void' and @property !='' and @property !=
'container' or
@property != 'container' or
@property != 'assetscontainer' or
@property != 'incomecontainer' or
@property != 'value' or
@property != 'variable' "
</xsl:when>

Any ideas why my code doesn't work?

Because your logic is flawed.

if @property != 'value' is false, then @property must equal "value", and
therefore @property != 'variable' will be true. So at least one of these
terms will be true, therefore the whole condition will be true.

Michael Kay