<context> asserts that the subelements it contains have the museum context implied by its CHIO attribute (one of the ‘CHIO access points’).

It can contain (and so give a context to) one or more <topic>s:

<context access-point="current-location">
 <topic access=point="identity-number" value="1969.11.1">
</context> 

or give a context to a piece of actual content:

<context CHIO="creation">The design of the tapestries had its
beginnings in <DATERANGE FROM="1679" TO="1679">1679</DATERANGE> when
<PERSNAME REG="LOUIS XIV">King Louis XIV</PERSNAME> received a set 
of sketches from <PERSNAME REG="Maurits, Johann">Johann 
Maurits</PERSNAME>. ...</context>