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DeadLetter CL Syntax

Caveat: This is a continuously evolving spec and will change as required.

Conversational Language is a general-purpose interpretive object language. Conceived by DeadLetter to be agile, easy to understand but above all, fast.

DeadCL uses two methods within it's Syntax, Fixed (those explained below) & Meaning Based (MBS), this combination enables developers to have the freedom to build their own program logic should they choose.


Used to ensured objects are included, before executing the Conversation.

Learn more (Preprocessor)

* Required to load (will always try trusted files first then local) before executing next action.
dld.keyset Prompt for Author key evaluation
- - Connect two statements
_imprt Used to import information
CALL - Call-after function, useful for interpretation
$POST Used to set the DeadLetter post address in a URL, should always be followed by '@'


Used to replace 'bulky' attributes and allow fast replacement or alteration at scale.

Learn more (Substitutions)

@ Substitution for a fully qualified domain name (FQDN)
@ID_ Substitution for DeadLetter's fully qualified domain name (FQDN)
$_ word Substitution for variable object(s).
word* When placed after a word it defines that every value shall be treated as equal (i.e fee & fees)
('   ') The contents is a deadID address, and can be access as an offical DeadLetter resource, by name rather than a fully qualified address
Do-ID: Sets the words (spaces recorded as _ underscores) after the : as your DeadLetter Offical ID
[email protected] Common qualified address, this is used to define the root address (generally reserved for Author Keys)
> Leading into, or to connect natural language
= Equals
.GTO The value is greater than 'x'
.LTO The value is less than 'x'


Expressions are used to aid object interpretation and help denote variables and constants.

Learn more (Expressions)

{ Contents treated as authoritative, largely reserved for inputs & output strings but not exclusive.
? Request object or action
^ Root command
// Used to link a qualified address with a command
{!important} Object(s) are important
' ' object contained is treated as {!important}
trusted_Cnvrstn Explicit approval statement for linked object
denied_Cnvrstn Explicit denial statement for linked object
[email protected] Denial statement any object resource not explicitly approved
/recall Recall statement
/RW Rewrite an Object, variable statement
_VAL Sets value of object
bnd change status of an object(s)
_all All recursive mentions or actions, where permitted
-L Local object, unsigned by DeadLetter
-R Remote object, Trusted and signed by DeadLetter
^disable_all When inserted into an Author Key it disables all root commands for connected Conversations
.PLL Used to retrieve, or pull object(s)
.DRP Used to remove/discard or drop object(s)
.LST Used to list object(s) requested, when the execution order is important
.OVRIDE Used to override an existing object state/interpretation


Used to aid explicit interpretation by RI.

Learn more (Variators)

C [   ] Indicates objects contained can be treated as fluid for recursive interpretations
C_impress Prompt for interpretation of object(s), useful to create/manage abstract information
C_var(   ) Contents between the parentheses is a variable object (string)
C#{   } Tokenise object(s)
inpr_ Interpretable object comes after
var_ List object variables for following statement
var(   ) Contents between the parenthesis is a variable object (string)
C_inpr(   ) Interpretable output will post between the parenthesis
C_FLUSH Force an object flush
C_PULL Recall interpretable output
C_POST Post output for isolated interpretation


Used to simplify abstract object definition within Libraries & Arrays.

Learn more (Objects)

A: Defines Array
OB Defines object
-N Object name follows, generally object names begin with an underscore
CLASS_ Set object class
RUN_ Executes multiple object strings as one, provided they are authoritative (contained in {   })
RECORD_ Allows for alteration of Object writes (not required to write an object)
POST_ Allows for alteration of Object Posting (not required to post an object)
DETECT_STATE Detect state of objects, in class
RECORD_STATE Records object state
HOLD_STATE Holds object state
WING_STATE Creates a wing (sub-class) of an object(s)
OB [   ] Defines, value of object contained
OB_{ '   ' } Defines name for an object class
OB -- Object statement follows
O_POST Post object


Used to simplify actions, generally not present within a Conversation file.

Learn more (Functions)

, Used as a separator
; Separates a KC from its sub-routine and action (within a Conversation)
; Separates a KC from associated object(s) with Libraries
$_ Key Command function attribute, often used for substitution

Parcel Specific

When using Parcel you'll need to understand how to use deadCL's Parcel commands.

PARCEL- Used to inform When PARCEL endpoints or parameters are present
G Generate a Parcel object
C Indicates CHAD is Parcel mode in use
A Indicates Arnold is Parcel mode in use
H Header parameters comes next
P Path parameters comes next
Q Query string parameters comes next
B Body parameters comes next
F Fixed Value comes next
QV_ Parcel Query string parameter object Value
PV_ Parcel Path parameter object Value
RV_ Parcel Request body parameters object Value
Auth Authentication header parameters

Basic Commands

When entered at your input address CL will respond accordingly.

^RUN Your connected Conversation will execute immediately, provided all the required information is present
^STOP Stop all actions being performed
^FLUSH Force reload of local Conversation file only


Specific measurements, provided by TIME_UNITS_2019 Library, when included.

T.S denotes second(s)
T.M denotes minute(s)
T.H denotes hour(s)
T.D denotes day(s)
T.W denotes week(s)
T.CM denotes month(s)
T.Y denotes year(s)


deadID Publicly accessible URL's to access CL resources
CL Conversational Language
AK Author Key
KC Key Command - primary executables in a Conversation
SOR Secondary Object Resources
Conversation health check Process of evaluating if a Conversation contains errors
Live-patching Process of 'patching' poor code when detected for the Author
Technical Advisor An individual certified to provide technical support by DeadLetter