XPath表达式，以获得从类型的asssembly的名字

这个XPath表达式挣扎，基本上我需要提取从一块这样的XAML程序集名称:

<Modularity:ModuleCatalog

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:Modularity="clr-namespace:Microsoft.Practices.Prism.Modularity;assembly=Microsoft.Practices.Prism"

    xmlns:AppInfo="clr-namespace:Example.Common.Services.Prism.Modularity;assembly=Example.Common.Services">

    <Modularity:ModuleInfoGroup InitializationMode="OnDemand">

        <AppInfo:ApplicationModuleInfo

            ModuleName="Administration"

            ModuleType="Example.UI.Administration.AdministrationModule, Example.UI.Administration, Version=1.2.1.1, Culture=neutral, PublicKeyToken=537c3450b3658434"

            Ref="Example.UI.Administration.xap" />

        <AppInfo:ApplicationModuleInfo

            ModuleName="Prescribing"

            ModuleType="Example.UI.Prescribing.PrescribingModule, Example.UI.Prescribing, Version=1.24.2.1, Culture=neutral, PublicKeyToken=537c3450b3658434"

            Ref="Example.UI.Prescribing.xap" />

        <AppInfo:ApplicationModuleInfo

            ModuleName="SampleModule"

            ModuleType="Example.UI.SampleModule.SampleModuleModule, Example.UI.SampleModule, Version=1.1.0.0, Culture=neutral, PublicKeyToken=537c3450b3658434"

            Ref="Example.UI.SampleModule.xap" />

    </Modularity:ModuleInfoGroup>

</Modularity:ModuleCatalog>

.//*[local-name() = 'ApplicationModuleInfo']/@ModuleType[substring-after(., ',')][substring-before(.,',')]

substring-before(., ",")