XSD Validation Using Schema Issue

I have a xml file like

<root>
  <requestId>1</requestId>
  <subRequest>
    <id>11</id>
    <date>18-02-2015</date>
  </subRequest>
  <subRequest>
    <id>12</id>
    <date>19-02-2015</date>
  </subRequest>
  .
  .
</root>

I have a XSD file which I cannot change and in that file the date have to be in some format. And there can be 1000 entries of "subRequest" tag. I created a schema validation to check the format.

So my problem is out of these 1000 entries, if there is only 2 entries whose date format is incorrect, how can I know id's of these 2 entries.

I am checking this when I am converting this xml into bean using JAXB(unmarshaller). I used schema validations and the validator.getLocalizedMessage() give null for both object and node. I can see only lineNumber and the general message about the issue format.