DTD Attribute enumerated list

Pepe

Hi,
I'm very new in XML and am seeking advice for the following:

My element DATA has a UNIT attribute that is an enumerated list.
This tag stores medical measurements, such as volume of aire, depth of the catheter and the speed of food within oesophagus.
How can I introduce [/] in my attribute?
Could someone help me out with this please???
thanks in advance.

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 <!ELEMENT DATA (#PCDATA)>

<!ATTLIST DATA UNIT (ml | mm | cm | cc | m/min | m/sec | cm/min | cm/sec | mm/min | mm/sec) #REQUIRED>

DTD Attribute enumerated list

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