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I noticed in DTDs that some people will always use an parameter entity reference, rather than specifying a content model directly i.e. <!ENTITY % Hr.content "EMPTY" > <!ELEMENT hr %Hr.content; > instead of: <!ELEMENT hr EMPTY > I can see the advantage of this approach when some or all of the content model for an element is long and/or is likely to be re-used elsewhere. In these cases, the parameter entity reference allows you to make a correction in one place, and save typing. However some people seem to do it everywhere. It just appears redundant when the text is not going to be re-used, and it increases the size of the DTD. What is the reasoning behind this approach? Does it relate to the using declarations in multiple DTDs?
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