<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">The SODA v1.0, in paragraph 4.2 "SODA Service Descriptor from DataLink" <div class="">expresses the maximum BAND interval in this way: </div><div class=""><pre xmlns="" style="margin-left: 2em;" class=""> <PARAM name="BAND" unit="m" ucd="em.wl;stat.interval"
datatype="double" arraysize="2"
xtype="interval" value="">
<DESCRIPTION>The wavelength intervals to be extracted</DESCRIPTION>
<VALUES>
<MIN value="3e-7"/>
<MAX value="8e-7"/>
</VALUE>
</PARAM> </pre><div class=""><br class=""></div></div><div class=""><b class="">The Issue</b></div><div class=""><br class=""></div><div class="">That is wrong, because the value attributes in the MIN and MAX elements are spelt as if the PARAM were of arraysize=“1”.</div><div class=""><br class=""></div><div class="">Indeed astropy gives a warning on that; try this:</div><div class=""><br class=""></div><div class=""><div class="">import pyvo</div><div class="">datalink_url = '<a href="http://archive.eso.org/datalink/links?ID=ivo://eso.org/ID?ADP.2016-11-17T12:51:01.877’" class="">http://archive.eso.org/datalink/links?ID=ivo://eso.org/ID?ADP.2016-11-17T12:51:01.877’</a></div></div><div class="">datalink = pyvo.dal.adhoc.DatalinkResults.from_result_url(datalink_url)</div><div class=""><br class=""></div><div class="">and you will get (until we fix our datalink)</div><div class=""><br class=""></div><div class=""><pre style="box-sizing: border-box; overflow: auto; font-size: 14px; padding: 1px 0px; margin-top: 0px; margin-bottom: 0px; line-height: inherit; word-break: break-all; word-wrap: break-word; background-color: rgb(255, 221, 221); border: 0px; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; white-space: pre-wrap; vertical-align: baseline;" class="">WARNING: E02: ?:?:?: E02: Incorrect number of elements in array. Expected multiple of 2, got 1 [astropy.io.votable.converters]</pre><div class=""><br class=""></div></div><div class=""><br class=""></div><div class=""><b class="">I think the solution is:</b></div><div class=""><br class=""></div><div class="">The PARAM expresses an interval, and as such the only possible way to describe its limits is by stating:</div><div class=""><pre xmlns="" style="margin-left: 2em;" class=""> <VALUES>
<MAX value=“3e-7 8e-7"/>
</VALUE> </pre><div class="">similarly to what is already done for the CIRCLE and other non scalar params.</div></div><div class="">(When I do that, astropy is happy)</div><div class=""><br class=""></div><div class="">I’m going to have our datalink changed accordingly, as I prefer not to have astropy complaining.</div><div class="">(you will notice when the example above will not throw any warning)</div><div class=""> </div><div class="">All the very best to all,</div><div class="">Alberto</div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>