cadence16.5的.xml格式的文件,求大侠指点

具体文件如下，请问这个文件是如何生成的?它是layout文件吗?
<?xml version="1.0" encoding="ISO-8859-1" ?>
- <ODX>
- <ODX_CAD>
- <ODX_HEADER TITLE="xxxx. x" SOURCE="SS2 BPc 7.2 Allegro SPB16.5" AUTHOR="xxxx" DATE="20120109" TIME="xx:xx:xx" VERSION="x.x" COMMENT="">
- <ATT_LIST>
  <ATT N=".primary_side" V="top" />
  <ATT N=".design_origin_x" V="0" />
  <ATT N=".design_origin_y" V="0" />
  </ATT_LIST>
  </ODX_HEADER>
- <CAD_DATA>
  <CAD_DATA_HEADER UNITS="METRIC" THICKNESS="1.6" />
- <CAD_LAYER_LIST>
  <CAD_LAYER NAME="comp_+_top" CONTEXT="BOARD" TYPE="COMPONENTS" SIDE="TOP" POLARITY="P" />
  <CAD_LAYER NAME="sst" CONTEXT="BOARD" TYPE="SILK_SCREEN" SIDE="TOP" POLARITY="P" />
  <CAD_LAYER NAME="spt" CONTEXT="BOARD" TYPE="SOLDER_PASTE" SIDE="TOP" POLARITY="P" />
  <CAD_LAYER NAME="smt" CONTEXT="BOARD" TYPE="SOLDER_MASK" SIDE="TOP" POLARITY="P" />
  <CAD_LAYER NAME="top" CONTEXT="BOARD" TYPE="SIGNAL" SIDE="TOP" POLARITY="P" />
  <CAD_LAYER NAME="layer2" CONTEXT="BOARD" TYPE="POWER_GROUND" SIDE="INNER" POLARITY="P" />
  <CAD_LAYER NAME="layer3" CONTEXT="BOARD" TYPE="POWER_GROUND" SIDE="INNER" POLARITY="P" />
  <CAD_LAYER NAME="bottom" CONTEXT="BOARD" TYPE="SIGNAL" SIDE="BOTTOM" POLARITY="P" />
  <CAD_LAYER NAME="smb" CONTEXT="BOARD" TYPE="SOLDER_MASK" SIDE="BOTTOM" POLARITY="P" />
  <CAD_LAYER NAME="spb" CONTEXT="BOARD" TYPE="SOLDER_PASTE" SIDE="BOTTOM" POLARITY="P" />
  <CAD_LAYER NAME="rout" CONTEXT="BOARD" TYPE="ROUT" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="comp_+_bot" CONTEXT="BOARD" TYPE="COMPONENTS" SIDE="BOTTOM" POLARITY="P" />
  <CAD_LAYER NAME="drill" CONTEXT="BOARD" TYPE="DRILL" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="1078_bottom" CONTEXT="MISC" TYPE="DOCUMENT" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="ss2_doc1" CONTEXT="MISC" TYPE="DOCUMENT" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="ss2_doc2" CONTEXT="MISC" TYPE="DOCUMENT" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="ss2_doc3" CONTEXT="MISC" TYPE="DOCUMENT" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="outline" CONTEXT="MISC" TYPE="DOCUMENT" SIDE="NONE" POLARITY="P" />
  <CAD_LAYER NAME="1078_top" CONTEXT="MISC" TYPE="DOCUMENT" SIDE="NONE" POLARITY="P" />
  </CAD_LAYER_LIST>