2.1.840 Part 1 Section 18.14.4, ddeLink (DDE Connection)
a. The standard does not specify length limits on @ddeService.
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Office enforces a minimum of 1 character and a maximum of 255 characters for @ddeService.
b. The standard does not specify length limits on the ddeTopic attribute.
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Office restricts the ddeTopic attribute to 255 characters.
c. The standard does not place a restriction on the maximum length of the ddeService attribute concatenated with the ddeTopic attribute.
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Office requires that the combined length of the ddeService and ddeTopic attributes be less than 255.
d. The standard does not place restrictions on the inclusion of '[' or ']' in the ddeService and ddeTopic attributes.
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Office requires that the concatenation of the ddeService attribute followed by the ddeTopic attribute contain at most one pair of square brackets ('[' and ']'), and that the opening bracket precede the closing bracket.