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@vendor is only required if the id is actually needed. That is, if
there is a locally defined AVP whose V flag is set and which does
not have a vendor id set by @avp_vendor_id.
Also, in the case of an inherited AVP, fix avp_name/2 in a generated
dictionary module defaulting vendor id from @vendor in the inheriting
dictionary but avp_header/1 defaulting it from the inherited dictionary.
In both cases the vendor id now defaults from @vendor in the inherited
dictionary.
Note that @avp_vendor_id from the inherited dictionary is
ignored: any changes from @vendor have to be explicit in the
inheriting dictionary. A better alternative to @avp_vendor_id
is to simply inherit from dictionaries setting the appropriate
@vendor but this was previously somewhat broken so @avp_vendor_id
was needed to set the id of an AVP whose definition was copied
from another source into a dictionary that only inherited from
the common dictionary (which doesn't set V on any AVPs).
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A dictionary need define neither messages nor grouped AVPs, in
which case no record definitions are generated. However, the
generated module still includes diameter_gen.hrl and this
requires some functions diameter_exprecs would otherwise insert,
even if the code that uses these will not be called.
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Errors are now detected after the parse with format_error/1
providing understandable error messages, pointing to the
offending line number(s) in the dictionary source.
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The previous parse was very adhoc and simply crashed on any kind
of input error, providing no identification of the objectionable input
that caused the parse to fail. The new parser is generated from a yecc
grammar, making it easier both to understand what it is that's being
parsed and to provide useful diagnostics to the user in case of error.
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Simpler, no duplication of similar makefiles and makes for
better dependencies. (Aka, recursive make considered harmful.)
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As a module-based alternative to the escript diameterc.
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This is to enable dictionaries compiled with --name/--prefix
to be inherited using --inherits.
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The section simply results in generated macros and has nothing
specifically to do with result codes. It's still not documented,
and neither are the macros generated from @enum, since the generated
names are typically so long as to be impractical/unreadable in source.
Better to use numeric values with a comment or define your own
shorter macros as the need arises.
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* anders/diameter/augment_inherited_enums/OTP-9469:
Allow @enum when AVP is defined in an inherited dictionary.
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3GPP standards (for one) extend the values allowed for RFC 3588
AVP's of type Enumerated. Previously, extending an AVP was only
possible by completely redefining the AVP.
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@id defines an application identifier and this is used only when sending
or receiving messages. A dictionary can define only AVP's however,
to be included by other dictionaries using @inherits, in which case it
makes no sense to require @id.
Note that message definitions are not inherited with @inherits, only
AVP's
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The application provides an implementation of the Diameter protocol
as defined in RFC 3588.
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