sig
  val project_xml_stream_from_document :
    Datatypes.xs_anyURI ->
    Path_struct.rooted_path_sequence ->
    Streaming_types.resolved_xml_stream ->
    Streaming_types.resolved_xml_stream
  val project_xml_stream_from_variable :
    Xquery_common_ast.cvname ->
    Path_struct.rooted_path_sequence ->
    Streaming_types.resolved_xml_stream ->
    Streaming_types.resolved_xml_stream
end