<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Meant to send this to fitsbits:<BR><DIV><BR><DIV>Begin forwarded message:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" size="4" color="#000000" style="font: 13.0px Helvetica; color: #000000"><B>From: </B></FONT><FONT face="Helvetica" size="4" style="font: 13.0px Helvetica">Rob Seaman <<A href="mailto:seaman@noao.edu">seaman@noao.edu</A>></FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" size="4" color="#000000" style="font: 13.0px Helvetica; color: #000000"><B>Date: </B></FONT><FONT face="Helvetica" size="4" style="font: 13.0px Helvetica">August 20, 2007 8:50:12 AM MST</FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" size="4" color="#000000" style="font: 13.0px Helvetica; color: #000000"><B>To: </B></FONT><FONT face="Helvetica" size="4" style="font: 13.0px Helvetica">Walter Jaffe <<A href="mailto:jaffe@strw.leidenuniv.nl">jaffe@strw.leidenuniv.nl</A>></FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" size="4" color="#000000" style="font: 13.0px Helvetica; color: #000000"><B>Subject: </B></FONT><FONT face="Helvetica" size="4" style="font: 13.0px Helvetica"><B>Re: [fitsbits] multiple keyword occurance in header</B></FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV> <DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">On Aug 20, 2007, at 7:58 AM, Walter Jaffe wrote:</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV> <BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Such occurances probably occur mostly when histories of</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">previous reduction steps are copied into the headers</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">of downstream products.<SPAN class="Apple-converted-space"> </SPAN>Originally this kind of</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">information was supposed to be recorded with</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">HISTORY keywords, but I can imagine that many</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">programmers ignore this option because it requires</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">reformatting each card image.<SPAN class="Apple-converted-space"> </SPAN>Maybe something like</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">BLOCK HISTORY BEGIN</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">... literal copy of keywords from previous steps ...</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">BLOCK HISTORY END</DIV> </BLOCKQUOTE><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Well, it's a good thought that we might want to understand why issues like duplicate keywords occur before making changes to the standard.<SPAN class="Apple-converted-space"> </SPAN>But I'm not sure I see the advantage of:</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>BLOCK HISTORY BEGIN</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>text 1</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>text 2</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>text 3</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>BLOCK HISTORY END</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">to</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>HISTORY text 1</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>HISTORY text 2</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>HISTORY text 3</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">other than gaining 8 characters per line.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">In any event, sequential header edits is only one way duplicates can arise.<SPAN class="Apple-converted-space"> </SPAN>NOAO iSTB grabs raw data from a couple of dozen different instruments.<SPAN class="Apple-converted-space"> </SPAN>These raw data often demonstrate a wide variety of "interesting" metadata, with just one example being duplicate keywords.<SPAN class="Apple-converted-space"> </SPAN>I would attribute this to an interaction between various groups (who often work for different organizations):<SPAN class="Apple-converted-space"> </SPAN>the instrument engineers, the data acquisition programmers, the telescope control system, the data handling system - to name a few.<SPAN class="Apple-converted-space"> </SPAN>There often is no one final arbiter of the content of the header - and this issue is rarely at the top of the list for anybody before the data reach the archivists.<SPAN class="Apple-converted-space"> </SPAN>In fact, an archive is an instrumentality for asserting coherent standards - but it requires a bit more subtlety than simply telling everybody up stream that something is verboten.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Rob</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV> </BLOCKQUOTE></DIV><BR></BODY></HTML>