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Auxiliary information to allow a printing application to use the channel for data submission to the printer. An application capable of using a specific PrtChannelType should be able to use the combined information from the prtChannelInformation and other channel and interface group objects to 'bootstrap' its use of the channel. prtChannelInformation is not intended to provide a general channel description, nor to provide information that is available once the channel is in use. The encoding and interpretation of the prtChannelInformation object is specific to channel type. The description of each PrtChannelType enum value for which prtChannelInformation is defined specifies the appropriate encoding and interpretation, including interaction with other objects. For channel types that do not specify a prtChannelInformation value, its value shall be null (0 length). When a new PrtChannelType enumeration value is registered, its accompanying description must specify the encoding and interpretation of the prtChannelInformation value for the channel type. prtChannelInformation semantics for an existing PrtChannelType may be added or amended in the same manner as described in section 2.4.1 for type 2 enumeration values. The prtChannelInformation specifies values for a collection of channel attributes, represented as text according to the following rules: 1. The prtChannelInformation is coded in the NVT ASCII character set. It is not affected by localization. 2. The prtChannelInformation is a list of entries representing the attribute values. Each entry consists of the following items, in order: a. a keyword, composed of alphabetic characters (A- Z, a-z), that identifies a channel attribute, b. an Equals Sign (=) to delimit the keyword, c. a data value, consisting of NVT ASCII graphics characters (codes 32-126), d. a Line Feed character (code 10) to delimit the data value. No other characters shall be present. Keywords are case-sensitive. Conventionally, keywords are capitalized (including each word of a multi-word keyword), and, since they occupy space in the prtChannelInformation, they are kept short. 3. If a channel attribute has multiple values, it is represented by multiple entries with the same keyword, each specifying one value. Otherwise, there shall be at most one entry for each attribute. 4. By default, entries may appear in any order. If there are ordering constraints for particular entries, these must be specified in their definitions. 5. The prtChannelInformation value may represent information that is not normally coded in textual form, or that is coded in a character set other than NVT ASCII. In these cases, whatever symbolic representation is conventionally used for the information should be used for encoding the prtChannelInformation. (For instance, a binary port value might be represented as a decimal number, Unicode would be represented in UTF-8 format.) 6. For each PrtChannelType for which prtChannelInformation entries are defined, the descriptive text associated with the PrtChannelType enumeration value shall specify the following information for each entry: Title: Brief description phrase, e.g.: 'Port name,'Service Name,' Keyword: The keyword value, eg: 'Port,' 'Service' Syntax: The encoding of the entry value, if it cannot be directly represented by NVT ASCII, Status: 'Mandatory,' 'Optional,' or 'Conditionally Mandatory,' Multiplicity: 'Single' or 'Multiple,' to indicate whether the entry may be present multiple times, Description: Description of the use of the entry, other information required to complete the definition (e.g.: ordering contstraints, interactions between entries). Applications that interpret prtChannelInformation should ignore unrecognized entries, so they are not affected if new entry types are added. Additional information: After telling the peripheral how many logical channels will be used, the IIO card tells the printer the value of the information value of each of the channels. The information is auxiliary information used in conjunction with the channel Type.
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