Property list objects and api for them.
Property List objects and API for them.
A property list (or plist for short) is a list of zero or more properties. A property consists of a key and a value, where key is a symbol and value is anything that can be cast to (void *).
If the key of a property is a managing key, its value is a managed object. A property list itself is a managed objects.
If each key of a plist is one of Msymbol, Mtext, Minteger, and Mplist, the plist is called as well-formed and represented by the following notation in the documentation.
PLIST ::= '(' ELEMENT * ')'
ELEMENT ::= INTEGER | SYMBOL | M-TEXT | PLIST
M-TEXT ::= '"' text data ... '"'
For instance, if a plist has four elements; integer -20, symbol of name 'sym', M-text of contents 'abc', and plist of integer 10 and symbol of name 'another-symbol', it is represented as this:
(-20 sym 'abc' (10 another-symbol))
Type of property list objects. The type MPlist is for a property list object. Its internal structure is concealed from application programs.
Symbol whose name is 'integer'. The symbol Minteger has the name 'integer'. The value of a property whose key is Minteger must be an integer.
Symbol whose name is 'plist'. The symbol Mplist has the name 'plist'. It is a managing key. A value of a property whose key is Mplist must be a plist.
Symbol whose name is 'mtext'. The symbol Mtext has the name 'mtext'. It is a managing key. A value of a property whose key is Mtext must be an M-text.
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