[isabelle] Quoted parameters to interpretation in LaTeX output

When an interpretation with quoted parameters appears in the Isar source, e.g.:

    interpretation foo "x y" z

in the LaTeX output there are no delimiters to separate the quoted parameter
from the others, so the output appears like:

    interpretation foo x y z

which is ambiguous to the human reader.  It is not clear that there is a way
to rectify this at the source level and I am in any case hesitant to try to
hack my source to work around something that seems to be an issue with
document processing.  I would think that the system should determine that the
piece of inner syntax "x y" ought to be parenthesized in the document output,
in order to remove ambiguity.

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