可以在外部XML中放置一个定义查询(实体框架)吗?

例如,在model.edmx文件中,我有:

        <Schema Namespace="dbModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2008" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">
  <EntityContainer Name="dbModelStoreContainer">
    <EntitySet Name="Students" EntityType="dbModel.Store.Students" store:Type="Tables" Schema="dbo" />
    <EntitySet Name="Teachers" EntityType="dbModel.Store.Teachers" store:Type="Tables" Schema="dbo" />
  </EntityContainer>
  <EntityType Name="Students">
    <Key>
      <PropertyRef Name="Id" />
    </Key>
    <Property Name="Id" Type="int" StoreGeneratedPattern="Identity" Nullable="false" />
    <Property Name="Name" Type="nvarchar(max)" Nullable="false" />
    <Property Name="TeacherId" Type="int" Nullable="false" />
  </EntityType>
  <EntityType Name="Teachers">
    <Key>
      <PropertyRef Name="Id" />
    </Key>
    <Property Name="Id" Type="int" StoreGeneratedPattern="Identity" Nullable="false" />
    <Property Name="Name" Type="nvarchar(max)" Nullable="false" />
  </EntityType>
  <Function Name="ListAllStudents" IsComposable="false">
  <CommandText>
    select * from student
    WHERE teacherid = @id;
  </CommandText>
  <Parameter Name="id"
             Mode="In"
             Type="int"/>
</Function>

</Schema>

是否有可能

<Function Name="ListAllStudents" IsComposable="false">
  <CommandText>
    select * from student
    WHERE teacherid = @id;
  </CommandText>
  <Parameter Name="id"
             Mode="In"
             Type="int"/>
</Function>

住在model.edmx之外并参考它?我想做的本质上类似于将不同的web.config节分解成它们自己的XML文件。我不想让EDMX文件对于一个项目来说太大,因为我将有很多定义好的查询。

**edit:code first实际上不是一个可靠的选项,因为我将使用已经定义的(遗留)数据库。