// default
var model = builder.Build(connection);

// with version
var model = builder.Build(new DbProviderInfo("System.Data.SqlClient", "2005"));

<?xml version="1.0" encoding="utf-8"?>
<SystemData xmlns="urn:deployment-systemdata-schema">
    <SchemaVersion Version="14.0.0.0" Build="14.0.6109.5002" DatabaseVersion="133739" SiteVersion="0" ObjectsProcessed="27" />
    <ManifestFiles>
        <ManifestFile Name="Manifest.xml" />
    </ManifestFiles>
    <SystemObjects>
        ...
    </SystemObjects>
    <RootWebOnlyLists />
</SystemData>

    <edmx:StorageModels>
      <Schema Namespace="Model.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="ModelStoreContainer">
          <EntitySet Name="Comment" EntityType="Model.Store.Comment" store:Type="Tables" store:Schema="dbo" store:Name="Comment">
            <DefiningQuery>SELECT 
      [Comment].[PersonID] AS [PersonID], 
      [Comment].[CommentTypeID] AS [CommentTypeID], 
      [Comment].[Note] AS [CO_Note]
      FROM [dbo].[Comment] AS [Comment]</DefiningQuery>
          </EntitySet>

          <EntitySet Name="Comment" EntityType="Model.Store.Comment" store:Type="Tables" Schema="dbo" >
          </EntitySet>

<#@ assembly name="System.Configuration" #>
<#@ assembly name="EnvDTE" #>
<#@ import namespace="System.Configuration" #>
<#@ import namespace="System.Text.RegularExpressions" #>
<#+
/// <summary>
/// Provides strongly typed access to the hosting EnvDTE.Project and app.config/web.config 
/// configuration file, if present.
/// 
/// Typical usage from T4 template:
/// <code>ConfigurationAccessor config = new ConfigurationAccessor((IServiceProvider)this.Host);</code>
/// </summary>
/// <author>Sky Sanders [sky.sanders@gmail.com, http://skysanders.net/subtext]</author>
/// <date>01-23-10</date>
/// <copyright>The contents of this file are a Public Domain Dedication.</copyright>
public class ConfigurationAccessor
{
   /// <summary>
   /// Typical usage from T4 template:
   /// <code>ConfigurationAccessor config = new ConfigurationAccessor((IServiceProvider)this.Host);</code>
   /// </summary>
   public ConfigurationAccessor(IServiceProvider host)
   {
      // Get the instance of Visual Studio that is hosting the calling file
      EnvDTE.DTE env = (EnvDTE.DTE)host.GetService(typeof(EnvDTE.DTE));
      // Gets an array of currently selected projects. Since you are either in this file saving it or
      // right-clicking the item in solution explorer to invoke the context menu it stands to reason
      // that there is 1 ActiveSolutionProject and that it is the parent of this file....
      _project = (EnvDTE.Project)((Array)env.ActiveSolutionProjects).GetValue(0);
      string configurationFilename=null;  
      // examine each project item's filename looking for app.config or web.config
      foreach (EnvDTE.ProjectItem item in _project.ProjectItems)
      {
            if (Regex.IsMatch(item.Name,"(app|web).config",RegexOptions.IgnoreCase))
            {
                // TODO: try this with linked files. is the filename pointing to the source?
                configurationFilename=item.get_FileNames(0);
                break;
            }
      }

      if(!string.IsNullOrEmpty(configurationFilename))
      {
           // found it, map it and expose salient members as properties
           ExeConfigurationFileMap configFile = null;
           configFile = new ExeConfigurationFileMap();
           configFile.ExeConfigFilename=configurationFilename;

           _configuration = System.Configuration.ConfigurationManager.OpenMappedExeConfiguration(configFile, ConfigurationUserLevel.None);
      }
  }

  private EnvDTE.Project _project;
  private System.Configuration.Configuration _configuration;

  /// <summary>
  /// Provides access to the host project.
  /// </summary>
  /// <remarks>see http://msdn.microsoft.com/en-us/library/envdte.project.aspx</remarks>
  public EnvDTE.Project Project
  {
      get { return _project; }
  }

  /// <summary>
  /// Convenience getter for Project.Properties.
  /// Examples:
  /// <code>string thisAssemblyName = config.Properties.Item("AssemblyName").Value.ToString();</code>

  /// <code>string thisAssemblyName = config.Properties.Item("AssemblyName").Value.ToString();</code>
  /// </summary>
  /// <remarks>see http://msdn.microsoft.com/en-us/library/envdte.project_properties.aspx</remarks>
  public EnvDTE.Properties Properties 
  {
       get { return _project.Properties;}
  }

  /// <summary>
  /// Provides access to the application/web configuration file.
  /// </summary>
  /// <remarks>see http://msdn.microsoft.com/en-us/library/system.configuration.configuration.aspx</remarks>
  public System.Configuration.Configuration Configuration
  {
       get { return _configuration; }
  }   

  /// <summary>
  /// Provides access to the appSettings section of the configuration file.
  /// Behavior differs from typical AppSettings usage in that the indexed
  /// item's .Value must be explicitly addressed.
  /// <code>string setting = config.AppSettings["MyAppSetting"].Value;</code>

  /// </summary>
  /// <remarks>see http://msdn.microsoft.com/en-us/library/system.configuration.configuration.appsettings.aspx</remarks>
  public  KeyValueConfigurationCollection AppSettings
  {
       get { return _configuration.AppSettings.Settings;}
  }

  /// <summary>
  /// Provides access to the connectionStrings section of the configuration file.
  /// Behavior is as expected; items are accessed by string key or integer index.
  /// <code>string northwindProvider = config.ConnectionStrings["northwind"].ProviderName;</code>
  /// </summary>
  /// <remarks>see http://msdn.microsoft.com/en-us/library/system.configuration.configuration.connectionstrings.aspx</remarks>
  public  ConnectionStringSettingsCollection ConnectionStrings
  {
        get { return _configuration.ConnectionStrings.ConnectionStrings;}
  }
}#>