SGML general rules and mixed content

Issue
SGML general rules and mixed content

Details
Mixed content in SGML corresponds to general rules in FM+SGML that contain <TEXT>. Anyone who is using SGML should avoid mixed content unless <TEXT> is allowed anywhere in the element. For example, the following general rules do not cause problems:

<TEXT>
(<TEXT>|EmphasizedPhrase|PartNumber|BookTitle)+

However, SGML has strange rules concerning white space that can cause unexpected results with rules such as:

A, (B|<TEXT>)
A,<TEXT>,B

Basically, the problem is that with rules such as those in this second group, white space is an error in contexts where it
would normally be ignored. An SGML exporter should avoid generating such white space. However, it is very easy to insert during manual editing. Thus, it’s best to avoid the problem by only using <TEXT> when it can occur throughout the content.


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