If you want to format the first element in a different way and put the first header in a other marker you can do it this way...

temp.getMyContent = COA
temp.getMyContent {
  	#This will become our first element, we clear all headers
  10 < styles.content.get - ERROR: Line 28: Object copied in this line "10 < styles.content.get" would leave either the value or properties untouched in TypoScript Version 1. Please check that this is not a problem for you.
  10.select.max=1
  10.renderObj.text.10 =
  	#These are the other elements we start with the second
  20 < styles.content.get - ERROR: Line 32: Object copied in this line "20 < styles.content.get" would leave either the value or properties untouched in TypoScript Version 1. Please check that this is not a problem for you.
  20.select.begin=1
}
temp.getHeader < styles.content.get
temp.getHeader {
  	#Only first element
  select.max=1
  	#Clear the renderObj and create a new one to display are header
  renderObj >
  renderObj=TEXT
  renderObj.field=header
  renderObj.wrap=<strong>|</strong>
   
}

Now just copy our two object in their markers for example this way

page.10.subparts{
  HEADER < temp.getHeader
  CONTENT < temp.getMyContent
}