Could you inform me about the format of old TM( *.tmx)?

Hello

I'm making the application which converts from Excel data to a translation memory(
old type *.tmx), because I was just asked for from the user.
It's done a lot, but when I make them read in Trados 2014,
* Errors occurred and any pairs are not convert to new translation memory(*.sdltm).
* There is attributes which can't be set.

1. The next error code goes out, where is it wrong?
Error: TagAnchorAlreadyUsed

//-------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<tmx version="1.4">
  <header creationtool="SDL Language Platform" creationtoolversion="8.0" o-tmf="SDL TM8 Format" datatype="xml" segtype="sentence" adminlang="ja-JP" srclang="ja-JP" creationdate="20160630T000000Z" creationid="unknown" />
  <body>
    <!--Error: TagAnchorAlreadyUsed-->
    <tu creationdate="20160630T000000Z">
      <prop type="x-OriginalFormat">Unknown</prop>
      <tuv xml:lang="en-US">
        <seg>In yet another embodiment, the amount of nucleic acid delivered to the cell in the first transfection is between about 20ng/cm<bpt i="1" type="1" x="1" />2<ept i="1" /> and about 250ng/cm<bpt i="1" type="2" x="1" />2<ept i="1" />, or between 100ng/cm<bpt i="1" type="3" x="1" />2<ept i="1" /> and 600ng/cm<bpt i="1" type="4" x="1" />2<ept i="1" />.</seg>
      </tuv>
//-------------------------------------------------

2. Could you inform me about the format of old TM( *.tmx)?

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