[Nexus] NeXus XML Meta-DTD format

[Jens Krüger]

Reading the "NeXus Technical Reference Manual" chapter 2.1.(9)
I found a some informations about the occurrence of some entries.
My question, how the following part is to interprete?

<NXsample>?
    <temperature>{Temperature of the sample}?</temperature>
<NXsample>

I understand as followed:

The NXsample section may occur one time or not. If the NXsample
section exist, the temperature section must exist, but it may be empty.

Or should it be interpreted as 

<NXsample>?
    <temperature>?{Temperature of the sample}</temperature>
<NXsample>

in the NXsample section may exist a subsection temperature?

Regards

Jens

-- 

Jens Krüger

Technische Universität München
ZWE FRM-II
Lichtenberg-Str. 1
D-85747 Garching

Tel: + 49 89 289 14 716
Fax: + 49 89 289 14 666
mailto:jens.krueger at frm2.tum.de
http://www.frm2.tum.de/