Campbell Scientific CR1000 Measurement and Control System - Manual (Page 377)

Section 8. Operation
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is_read_only
Boolean value that is set to true if the symbol is considered to
be read-only. A value of false would indicate an expectation
that the symbol value can be changed using the SetValueEx
command.
can_expand
Boolean value that is set to true if the symbol has child values
that can be listed using the BrowseSymbols command.
If the client specifies the URI for a symbol that does not exist, the server will
respond with an empty symbols set.
HTML Response
When html is entered in the BrowseSymbols format parameter, the response will
be HTML. Following are example responses.
HTML tabular response:
HTML page source:
BrowseSymbols Response