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Several characters have special meaning when found in "unknown entity" string data in
ACIS SAT (.sat) files. Therefore, these characters should not be contained in any user string data written to SAT files. This includes string data in attributes, but applies to string data in any unknown entities.
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Note
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This only applies to unknown entity string data written to text save files (.sat); binary files (.sab) are not affected.
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The portion of the
ACIS save (.sat) file restore code that processes unknown entities reserves the following special characters (these are discussed elsewhere in this chapter):
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{
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An opening (left) curly brace begins a subtype definition.
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}
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A closing (right) curly brace terminates a subtype definition.
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$
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A dollar sign indicates a pointer definition.
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#
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A pound sign terminates an entity record.
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@
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An at sign starts a string record.
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If these reserved characters are encountered in unknown entity string data when a
.sat file is restored (read in), the unknown entity reader will not process the data correctly because these characters are interpreted as special tokens. Because this processing only applies to unknown entities, applications that "know about" entities containing these characters should be able to process the files. However, if the files are shared with other applications, problems may arise.
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