FIELD OF THE INVENTION 
     The present invention relates to a method for generating and modifying distribution lists for the purpose of electronic distribution of information to entries on the list and in particular, this invention relates to a method for automatically modifying a previously generated distribution list by applying a set of one or more predefined rules. 
     BACKGROUND OF THE INVENTION 
     Advancements in technology have made the electronic distribution of information a more convenient task. Satellites, telephone systems and communication networks such as the Internet provide many tools to communicate information. As a result of the ability to conveniently distribute information, organizations have incorporated these technological advancements into their operations. One approach in the mass distribution of information is to have distribution lists. These lists contain several names or entries that simultaneously receive information from a source. A result of the increasing number of potential data recipients is the difficultly in coordinating data delivery to a wide audience, e.g., a large number of recipients. Towards this end, distribution lists, or “mailing lists” in an electronic document context such as E-mail, have been developed to facilitate grouping and tracking recipients. 
     The creation of these lists can be a tedious and/or complex manual task, since there may be many list members requiring processing for entry on to the list. Some of these lists are manually created and other lists are automatically created based on characteristics of an environment, e.g., a “customers” list may refer to all customers of a computing system. However, regardless of how the list is created, in some instances, persons that need to receive the information are omitted from the distribution list. When omissions occur, the sender may not be aware of the omission or may not know of persons that need to receive the information. Traditional static distribution lists and dynamic distribution lists do not provide the features commonly needed in a multiple of usage scenarios. 
     There are several usages of distribution lists that are not efficiently addressed using present static or dynamic distribution lists. The present state of distribution lists does not provide the following functionality: (1) Permanent and Semi-permanent modification of static distribution lists from a message destination field; (2) Semi-temporary modification with a temporal component static distribution lists from a message destination field; and (3) Creation of semi-permanent or permanent distribution lists by combining static or dynamic distribution lists using a variety of set operations. 
     Current technology has addressed some of the problems associated with modifying electronic distribution lists. U.S. patent application, publication number 2005/0010645 provides a method in which additive and subtractive message operations can be performed on a distribution list based at least in part on an intersection of various distribution lists to determine, if only temporarily, a new distribution list for a message. A particular distribution list may respectively be combined or intersected with an additive or a subtractive distribution list. Thus, for example, an e-mail message may be addressed to a distribution list for all employees, but where a subtractive list is applied to remove certain employees from receiving the e-mail message. The distribution list for all employees need not be altered. Although this method does provide a means to modify distribution lists, this method is limited and does not provide any features to semi-permanent distribution lists that last for an extended period of time following the distribution of information to entries on that semi-permanent distribution list. In addition, this method does not provide the means for incorporating dynamic decision-making capabilities for determining whether to save a newly generated distribution list into message transmission instructions. 
     There remains a need for an advanced method for automatically modifying a previously generated distribution lists based on a set of one more distribution rules. The list modification is done without interaction or input by the user or sender of the message. 
     SUMMARY OF THE INVENTION 
     This method of the present invention describes a method to automatically and dynamically modify a currently created distribution list using a predetermined set of rules. After the generation of a distribution by a user and prior to submission of the message to entries on the generated list, the method of the present invention examines the entries in the created distribution list. The method determines if any of a set of predetermined rules applies to the initially generated list. If any of the rules do apply to the list, then the list is modified based on the criteria of the rule. If there is more than one rule that applies to the initially generated list, then in this method there can be determination of whether the applicable rules conflict with each other. When there is a conflict a priority of the rules is made and the rules are applied to the list according to the established priority. In this method, the user or message sender does not approve the list once it has been modified. The information in the message is automatically sent to the entries on the newly generated list. If there are no rules that apply to the initial distribution list, then the information contained in the message is sent to the entries on the initial distribution list. 
     This invention enhances current art with the ability to add situational business flexibility, nested grouping capabilities and enable dynamic updates to a predefined distribution list. The disclosed methods enable temporary or permanent modification of distribution lists from information derived from the entries in the list. Such modifications are often needed when users do not know all persons that should receive certain information. 
     The invention includes methods to use mathematical formulas, logical operations, and programmable operators to create an adaptive group list that addresses situational needs of the sender and recipients. Note that such adaptive groups as defined here could be used in conjunction with any kind of electric communication methodologies. 
     Mathematical Operations Include: 
     “+” for addition, i.e., add a user to the group 
     Logical Operations can be: 
     UNION—for union of multiple sets 
     The invention is a combination of known techniques in a non-obvious manner, as well as the creation of new techniques. The known elements, which are combined, are collaboration software and dynamic distribution lookups. The new techniques include the application of mathematical symbols to distribution lists and set operations upon distribution lists. The added flexibility of the present invention to existing technology with regard to the modification of distribution groups allows senders to modify existing, defined groups to ensure that all appropriate persons receive transmitted information. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a pictorial representation of a personal computing device, which may be used in implementation of the present invention. 
         FIG. 2  is a screen of a device (a computer screen) used for transmission of information to entries on a distribution list. 
         FIG. 3  is a list of entries in multiple groups from which a user may want to send. 
         FIG. 4   a  is a sample list of rules that would apply to message list in order to generate alternate distribution list. 
         FIG. 4   b  is an illustration of modified distribution lists generated from rules displayed in  FIG. 4   a.    
         FIG. 5  is a flow diagram of a method in the implementation of an embodiment of the present invention. 
         FIG. 6  is a flow diagram of the steps of the method of the present invention in which in which there is a determination of whether multiple rules that apply to an initial distribution list conflict. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention provides a method for creating and/or modifying distribution lists used for mass distribution of information to entries on the distribution list. This method can apply to any form of distribution for example email messages or telephone messages. Although there can be various applications of the technology described in the present invention, the application used for the purpose of describing the invention will be an electronic mail application. 
     With reference now to  FIG. 1 , there is depicted a pictorial representation of computing device  100  which may be used in implementation of the present invention. Although the invention is described in terms of the device illustrated in  FIG. 1 , other types of electronic devices capable of transmitting and receiving information can be used in the implementation of the present invention. As seen in  FIG. 1 , data processing system  100  includes processor  110  that preferably includes a graphics processor, memory device and central processor (not shown). Coupled to processor  110  is video display  120  which may be implemented utilizing either a color or monochromatic monitor, in a manner well known in the art. Also coupled to processor  110  is keyboard  130 . Keyboard  130  preferably comprises a standard computer keyboard, which is coupled to the processor by means of cable  140 . Also coupled to processor  110  is a graphical pointing device, such as mouse  150 . Mouse  150  is coupled to processor  110 , in a manner well known in the art, via cable  160 . As is shown, mouse  150  may include left button  170 , and right button  180 , each of which may be depressed, or “clicked”, to provide command and control signals to data processing system  100 . While the disclosed embodiment of the present invention utilizes a mouse, those skilled in the art will appreciate that any graphical pointing device such as a light pen or touch sensitive screen may be utilized to implement the method and apparatus of the present invention. Upon reference to the foregoing, those skilled in the art will appreciate that data processing system  100  may be implemented utilizing a personal computer. 
       FIG. 2  shows a screen  200  that a sender may use to designate the distribution list and the sending or distribution requirements for the message. As shown, the screen appears to be a typical screen used to compose and send an electric mail message. The message area  202  provides the place for the sender to compose the message. The screen also has many features that are common to electronic mail systems. The “To” field  204  also referred to as the ‘destination field’ provides a place for the sender to input the destination location information. Below the message area are other message controls available to the user. Also included in the message is a subject field  206 . This field can be used to identify a description of the message content. One example is to identify the project name or group name in the project. 
       FIG. 3  shows potential entries from which one can generate initial and modified distribution lists. These entries represent personnel that are part of a project referred to as the Eagle Project. The personnel includes group leaders (L), engineers (E) and programmers (P). In this project, there are two phases and four separate groups: Alpha, Beta, Delta and Gamma. There can be occasions when a message is sent to some persons in this project, but other persons in the project that should also receive the message are omitted from the distribution list. This list of personnel can be stored in a memory location or directory such that the project, phase, group and each individual are stored in the memory location. The project information can be used to identify different criteria from which the present invention generates alternate distribution lists. The groups in  FIG. 3  will be used to illustrate the steps in the present invention. 
       FIG. 4   a  illustrates a set of rules stored in a rules repository that can be used to modify distribution lists. In Rule  1 , all emails sent to a group member related to the Eagle Project are distributed to the group leader. In Rule  2 , any email message sent to an engineer in a phase ( 1  or  2 ) of the Eagle Project is sent to each engineer in that project phase. When Rule  3  is applied to a distribution list any message received by a programmer in a group is sent to each programmer in the group of the initial message recipient. For Rule  4 , any project related email sent to a group leader is sent to each project group leader. 
       FIG. 4   b  illustrates the application of rules in this method. In the first example, the initial distribution list contains two entrants from the group alpha list. These two entrants are engineers. Applying Rule  1 , all messages sent to a group member related to the Eagle Project are sent to the group leader. As result, the initial list is modified to include the group leader. In the second example, the initial distribution list includes entrants from the alpha and beta groups. The list contains engineers. Rule  2  modifies a distribution list containing entrants that are engineers to include all entrants in a phase of the Eagle Project. The modified list includes all of the entrants from the Alpha and Beta groups that are engineers. In the third example, the initial list contains entrants from Alpha, Beta and Delta groups. Rule  4  takes any Eagle Project related message sent to a group leader and sends it to all group leaders in the project. The modified distribution list adds the Gamma group leader. As mentioned the message is automatically sent to the entrants on the modified distribution list. 
       FIG. 5  shows a flow diagram of a basic description of the method of the present invention. In this method, the initial step  500  is to establish an initial directory of potential list entries. Referring to  FIG. 4 , this initial directory could be the people included in the Eagle Project. The initial directory could also be a general company directory, all employees, or all persons in a particular department. This directory can be generated as desired by those implementing the method. The directory and rules that govern changes to initial distribution list entries can be stored in a rules database or repository. Each initial distribution will contain entries. Each entry is designed with a unique identifier in that particular list. In addition, each list is uniquely identified. Referring to  FIG. 3 , the Alpha group can have an identifier that describes this list as being Group Alpha, Phase I of project Eagle. In addition, each entry can have a one character or string identification along with the information related to the group, phase and project identities. 
     In step  502 , the user submits a message for electronic distribution. This message has an initial distribution of entries that are to receive this message. The method of the present invention detects when the user submits this initial message. Before this message reaches the email server, the present invention in step  504  detects and intercepts the message. At this point, step  506  examines the entries in the message. This examination attempts to identify possible rules that could apply to the list. One approach to implementing this step is to read the subject field  206 . If the field has the content description “Eagle Project”, then the method could detect it and use that information to identify certain rules that are related to the Eagle Project messages. Another approach could be based on the identity of the sender or a combination of the sender&#39;s identity and the content of the subject field. At this point, step  508  determines whether there are any rules that would apply to the current message. If step  508  determines there are no rules that apply to the message, the method moves to step  512  where the message is sent to the entrants on the initially assembled distribution list. If in step  508 , rules are found that are applicable to the message and distribution list, then the method moves to step  510  where it applies the rule or rules to the initial distribution list and generates a modified distribution list. At the completion of the generating of the modified distribution list, the message is transmitted to the entrants on the newly generated distribution list in step  514 . 
     Referring back to  FIG. 4   b , if a message contains the phrase “Eagle Project” and had a distribution list that contains group leaders Alpha  1 , Beta  1  and Delta  1 . From the method in  FIG. 5 , step  506  would identify this message as one related to the Eagle Project. At that point, step  508  would examine the list of entrants on the initial distribution list and determine that the list only includes group leaders. There would be a search of the stored rules to determine if any of the rules applied to this list. This search would be based on the name of the project found in the content space and the characterizing of the entrants on the initial distribution list. This step would determine from the characterization of the entrants that the entrants are group leaders. Each entrant could have a code that identifies him or her in some manner. A search of the rules database would produce rule  4 . This rule states that any project related message sent to a group leader should be sent to all group leaders on the project. This step  508  would further determine that not all group leaders from the Eagle Project are on the initial distribution list. As a result, rule  4  would be applied to the initial distribution list. This list would be modified in step  510  to generate a new list that includes the group leader for the Gamma group. 
       FIG. 6  illustrates a method of the present invention when there is a conflict between the applications of rules. In this method, the initial steps  600 ,  602 ,  604 ,  606 ,  608  and  612  have the same functions as steps  500 ,  502 ,  504 ,  506 ,  508  and  512  of the  FIG. 5  respectively. In step  608 , there is a determination of whether there are applicable rules for the distribution list. If step  608 , determines that there are no rules that apply to the message, the method moves to step  612  where the message is sent to the entrants on the initially assembled distribution list. If step  608  determines that there are rules applicable to the project, steps  610  determines whether there is more than one applicable rule. If there is only one applicable rule determined in step  610 , the method moves to step  624  which generates a most recently modified distribution list based the one applicable rule, after which the method moves to step  622 . If there are multiple applicable rules determined in step  610 , then the method moves to step  614  where there is a determination of the priority of the application of the rules. When the priority is determined, step  616  will modify the initial list based on the application of the rules with the highest priority. Once the list has been modified based on the highest-ranking rule, the modified list is again modified based on the secondary rule in step  617 . After the modification based on the first secondary rule, step  618  determines whether there are any more application rules. When step  618  determines that there are more applicable rules, the method returns to step  617  and applies the next rule. When the determination in step  618  is that there are no more rules, the distribution list that has been modified multiple times becomes, in step  620 , the most recently modified list. The message is transmitted to the entrants in the most recently modified list in step  622 . When the same address appears in more than one rule, only one instance of that address needs to be added to the distribution list. 
     Referring to  FIG. 6 , there is a message with a distribution list that included: Alpha  1 , Alpha  2 , Beta  3  and Beta  4 . Several rules can apply to this message. Rule four includes all group leaders on a message to a group leader. Alpha  1  is a group leader. Rule two includes all engineers in a phase on an email to an engineer in that phase. Alpha  2 , Beta  3  and Beta  4  are engineers in the same phase of the project. The priority could be Rule four and then Rule two. One explanation could be organizational and group leaders go before engineers. The initial list would first be modified in step  614  to include Beta  1 , Delta  1 , and Gamma  1 . At this point, the second rule, Rule two would be used in step  616  to modify the modified list. This modified list would include: Alpha  1 , Alpha  2 , Beta  1 , Beta  2 , Beta  3 , Beta  4 , Delta  1  and Gamma  1 . Since there are no more rules that are applicable, this second modified list would be the final list. Step  620  would transmit the message to entrants on this final list. 
     To those skilled in the art, it is observed that this invention may have variations, such as: Different mathematical operators may be chosen to represent either the same or different operations defined in this disclosure; Other algebraic or set theory operations may be applied to distribution groups; Different grouping operations may be used; and other default fields for additions to a distribution list such as the “Cc” or “Bcc” fields. 
     It is important to note that while the present invention has been described in the context of a fully functioning data processing system, those skilled in the art will appreciate that the processes of the present invention are capable of being distributed in the form of instructions in a computer readable medium and a variety of other forms, regardless of the particular type of medium used to carry out the distribution. Examples of computer readable media include media such as EPROM, ROM, tape, paper, floppy disc, hard disk drive, RAM, and CD-ROMs and transmission-type of media, such as digital and analog communications links.
An initial distribution list is dynamically modified using criteria determined from the current entries in the list. After an originator generates a distribution list and prior to submission of the message to entries on the generated list, the method of the present invention examines the entries in the created distribution list. From this list, the invention identifies features of the entries. From these features, the method generates criteria that can be used to generate additional entries that may be included in the list. In one approach, the generated criteria are presented to the user for review and approval. If the originator approves the criteria, the generated list is modified to add additional entries to the distribution based on the generated criteria. If the originator rejects the criteria, the initially generated list is submitted and the message is sent to the entries on the initial list.