| { | |
| "paper_id": "A92-1010", | |
| "header": { | |
| "generated_with": "S2ORC 1.0.0", | |
| "date_generated": "2023-01-19T02:03:30.240695Z" | |
| }, | |
| "title": "Integrating Natural Language Components into Graphical Discourse", | |
| "authors": [ | |
| { | |
| "first": "Stephan", | |
| "middle": [], | |
| "last": "Dilley", | |
| "suffix": "", | |
| "affiliation": {}, | |
| "email": "dilley@darmstadt.gmd.de" | |
| }, | |
| { | |
| "first": "John", | |
| "middle": [], | |
| "last": "Bateman", | |
| "suffix": "", | |
| "affiliation": {}, | |
| "email": "" | |
| }, | |
| { | |
| "first": "Ulrich", | |
| "middle": [], | |
| "last": "Thiel", | |
| "suffix": "", | |
| "affiliation": {}, | |
| "email": "thiel@darmstadt.gmd.de" | |
| }, | |
| { | |
| "first": "Anne", | |
| "middle": [], | |
| "last": "Tissen", | |
| "suffix": "", | |
| "affiliation": {}, | |
| "email": "tissen@darmstadt.gmd.de" | |
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| "abstract": "In our current research into the design of cognitively well-motivated interfaces relying primarily on the display of graphical information, we have observed that graphical information alone does not provide sufficient support to users particularly when situations arise that do not simply conform to the users' expectations. This can occur due to too much information being requested, too little, information of the wrong kind, etc. To solve this problem, we are working towards the integration of natural language generation to augment the interaction functionalities of the interface. This is intended to support the generation of flexible natural language utterances which pinpoint possible problems with a user's request and which further go on to outline the user's most sensible courses of action away from the problem. In this paper, we describe our first prototype, where we combine the graphical and interaction planning capabilities of our graphical information system SIC! with the text generation capabilities of the Penman system. We illustrate the need for such a combined system, and also give examples of how a general natural language facility beneficially augments the user's ability to navigate a knowledge base graphically.", | |
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| "text": "In our current research into the design of cognitively well-motivated interfaces relying primarily on the display of graphical information, we have observed that graphical information alone does not provide sufficient support to users particularly when situations arise that do not simply conform to the users' expectations. This can occur due to too much information being requested, too little, information of the wrong kind, etc. To solve this problem, we are working towards the integration of natural language generation to augment the interaction functionalities of the interface. This is intended to support the generation of flexible natural language utterances which pinpoint possible problems with a user's request and which further go on to outline the user's most sensible courses of action away from the problem. In this paper, we describe our first prototype, where we combine the graphical and interaction planning capabilities of our graphical information system SIC! with the text generation capabilities of the Penman system. We illustrate the need for such a combined system, and also give examples of how a general natural language facility beneficially augments the user's ability to navigate a knowledge base graphically.", | |
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| "section": "Abstract", | |
| "sec_num": null | |
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| "text": "Natural language interfaces to information systems allow the user to converse with the system in a natural way without being restricted by the syntax of a formal query language. However, users often have difficulties in stating their information need precisely (cf. Brooks et al., 1986) and so a user interface design emphasizing multimedia aspects of information systems may be more appropriate. An object oriented presentation meets this requirement because users are allowed to investigate information items directly. Thus, the distance between the users' intentions and the objects they involve is reduced to a minimum (cf. Hutchins et al., 1986) . However, visual presentations of abslract information items have to be designed carefully to support the user in perceiving them correctly. Often the inherent limitations of available presentation forms, e.g. the number ofdisplayable items, are an impediment to an adequate visualization. These difficulties which are well known in visu-al languages can be attacked by combining the presentation of graphical objects to the user with cooperative system responses in natural languages.", | |
| "cite_spans": [ | |
| { | |
| "start": 266, | |
| "end": 286, | |
| "text": "Brooks et al., 1986)", | |
| "ref_id": "BIBREF8" | |
| }, | |
| { | |
| "start": 628, | |
| "end": 650, | |
| "text": "Hutchins et al., 1986)", | |
| "ref_id": "BIBREF17" | |
| } | |
| ], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "I Introduction", | |
| "sec_num": null | |
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| "text": "Our approach to human-computer interaction provides the basis for an integration of different interaction styles, in our case natural language and graphics, in a multi-modal information system. The choice of an appropriate combination of modes is essential for a successful interface design. As there is not yet a complete theory of multi-modal interaction, this question has to be answered experimentally. Therefore, we propose a modular architecture for multi-modal interfaces composed of interaction tools. In this paper, we discuss the addition ot natural language generation to the interaction tools provided. This capability is embodied in the prototype IGiNG (_Integrating Graphics and Natural Language Generation) which combines", | |
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| "section": "I Introduction", | |
| "sec_num": null | |
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| "text": "\u2022 the graphical information system SIC! (System for Information on Conferences) comprising a dialog manager which is able to track the user's goals and, consequently, to plan system reactions as cooperative responses (Tissen, 1991) , a database access module providing relevant data (Kracker, 1991) and apresentation manager generating visualizations of the retrieved information items (Kerner and Thiel, 1991) .", | |
| "cite_spans": [ | |
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| "start": 217, | |
| "end": 231, | |
| "text": "(Tissen, 1991)", | |
| "ref_id": "BIBREF38" | |
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| { | |
| "start": 283, | |
| "end": 298, | |
| "text": "(Kracker, 1991)", | |
| "ref_id": "BIBREF21" | |
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| "start": 386, | |
| "end": 410, | |
| "text": "(Kerner and Thiel, 1991)", | |
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| "section": "I Introduction", | |
| "sec_num": null | |
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| "text": "\u2022 the text generation component KOMET/Penman (Bateman et al., 1991; Penman, 1989) , comprising extensive grammatical, semantic, and text organizational linguistic resources.", | |
| "cite_spans": [ | |
| { | |
| "start": 45, | |
| "end": 67, | |
| "text": "(Bateman et al., 1991;", | |
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| "start": 68, | |
| "end": 81, | |
| "text": "Penman, 1989)", | |
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| "section": "I Introduction", | |
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| "text": "The paper is organized as tbllows: first, we describe relate( work and how our approach goes beyond this, second, w~ introduce the basic components of our system and explain hov they can be appropriately interfaced. Then, we go on to discus: the benefits that including a natural language component caJ bring for augmenting the coherence and functionality of~ user's interaction with the system. We offer some examples o helpful responses that the system can make which would bq difficult, if not impossible, to represent graphically in a non a, hoc fashion. Finally, we describe some possible future direc tions.", | |
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| "section": "I Introduction", | |
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| "text": "One body of related work has primarily intended to coordinate different modes of expression within a framework of natural communication (cf. Hayes, 1987; Neal and Shapiro, 1988; Cohen et al., 1989, Feiner and McKeown, 1990; Bandyopadhyay, 1990; S tock, 1991; Wahlster et al., 1991) . The principle effort here is to ascertain factors that can motivate the distribution of information across different modes (e.g. Arens and Hovy, 1990) . A further body of related work moves towards problems of interaction by exploring the potential of the combination of natural language and deictic gestures (cf. Allgayer et al., 1989; Moore and Swartout, 1990) . In a similar vein, approaches to flexible graphical interaction based on the conversationalmetaphor (cf. Reichman, 1986 Reichman, , 1989 Thiel, 1990) treat user inputs such as mouse clicks, menu selections, etc. not as invocations of methods that can be executed without regarding the dialog context, but instead as dialog acts expressing a discourse goal of the user. The direct manipulation of an object then becomes itself a part of the dialog of the user with the system, meaning that the system can respond in a more flexible way by taking into account the illocutionary and semantic aspects of the user's input. Related work from generation includes the correction of misconceptions in the work of McCoy (1986) and the explicit representation of information about a system's own knowledge and planning activities that is found in the Explainable Expert Systems system of Swartout and Smoliar (1987) . None of this work, however, addresses the problems of meta-dialog concerning graphically supported interaction.", | |
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| "end": 153, | |
| "text": "Hayes, 1987;", | |
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| "end": 177, | |
| "text": "Neal and Shapiro, 1988;", | |
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| "text": "Cohen et al., 1989, Feiner and", | |
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| "text": "McKeown, 1990;", | |
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| "text": "Bandyopadhyay, 1990;", | |
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| "text": "S tock, 1991;", | |
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| "start": 259, | |
| "end": 281, | |
| "text": "Wahlster et al., 1991)", | |
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| "start": 413, | |
| "end": 434, | |
| "text": "Arens and Hovy, 1990)", | |
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| "start": 598, | |
| "end": 620, | |
| "text": "Allgayer et al., 1989;", | |
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| "end": 646, | |
| "text": "Moore and Swartout, 1990)", | |
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| "end": 768, | |
| "text": "Reichman, 1986", | |
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| "end": 785, | |
| "text": "Reichman, , 1989", | |
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| "start": 786, | |
| "end": 798, | |
| "text": "Thiel, 1990)", | |
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| "end": 1365, | |
| "text": "McCoy (1986)", | |
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| "end": 1553, | |
| "text": "Swartout and Smoliar (1987)", | |
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| "section": "Related Work", | |
| "sec_num": "2" | |
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| "text": "In our approach we bring the kind of natural language capabilities required by the first body of related work (i.e., graphical and natural language information functioning together) to bear on the kinds of problems that arise in the second body of related work when the direct manipulation of objects by a user creates goals that the system cannot fulfil. Here we must not only respond to the user's attempt to manipulate an object or the user's deictic gesture as a dialog act, but also be able to en-gage in a meta-interaction to debug that act if it creates a problematic situation. We show that natural language possesses properties that make it preferable over the graphical mode of expression for such meta-interaction and hence natural language generation needs to be supported even in graphics-oriented interfaces.", | |
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| "text": "We demonstrate the combination of graphics ,and natural language output in the context of the SIC! system, SIC[ is implemented using HyperNews (HyperNews, 1989) , a hypermedialike user-interface management system which can be controlled from aLISP-client. SIC! offers information on conferences; its domain consists of abstract information on conferences including workshops, tutorials, persons, institutes, and conference topics. A user who wants to obtain information from SIC! poses a query whereafter he can inspect the data retrieved. This is done by selecting a presentation form. In SIC! we use several cognitively motivated presentation forms (Kemer and Thiel; .", | |
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| "start": 143, | |
| "end": 160, | |
| "text": "(HyperNews, 1989)", | |
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| "start": 651, | |
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| "text": "(Kemer and Thiel;", | |
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| "section": "The SIC!-System", | |
| "sec_num": "3" | |
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| "text": "One of these forms is the ring presentation form (cf. Figure 1 ) which surveys a structure of given data. All items are positioned on a virtual ring structure, the relations between the concepts being presented as single lines. In our example the ring presentation form contains the categories workshop and topic. The concepts of the workshops are on the left side of the figure, those of the topics on the right. However, this presentation form is clearly limited with respect to the quantity of data that can be presented simultaneously.", | |
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| "start": 54, | |
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| "section": "The SIC!-System", | |
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| "text": "Consider, for example, the following situation: A user asks for a subset of the IJCAI89 workshops and their related topics. SIC! retrieves three workshops and several topics. If the user wants to get an overview of the data's structure, then for this goal the ring is the most adequate presentation form available in SIC! But this causes a problem when the ring form cannot display as many data as SIC! retrieved. There are several ways of solving this problem, depending on the user's main Table presentation form is interested more in the structure of the data, he might change his initial query so that less data are retrieved. But, importantly, the user cannot be aware of the details of the current situation of retrieval and its implications simply from the graphical information displayed. Hence the system has to inform him of the situation and offer possible alternatives. This needs to be done in a way that enables users to grasp the situation and to choose the appropriate alternatives for their purpose. To achieve this, the system has to create a coherent informative act that is concise and yet unambiguous (in context), giving all the information necessary for the user to determine his future actions.", | |
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| "start": 491, | |
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| "text": "Table presentation form", | |
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| "section": "The SIC!-System", | |
| "sec_num": "3" | |
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| "text": "Based on work by Feiner and McKeown (1990) on the coordination of text and graphics in explanation generation and by Lombardi (1989) , who examined the assignment of information to media, we assume that text is the appropriate medium for informative acts in meta-dialogs, since a wellconstructed text is not only concise and easy to understand, but also guarantees the necessary flexibility to meet any situation that ,arises. Graphical 'acts' cannot be constructed compositionally to express possibly unforeseen complex circumstances: novel graphics must first be learnt by users--a situation avoided by the generation of situationally appropriate natural language. Thus, generating natural language text, particularly text involving controlled and appropriate deployment of text-forming resources such as rhetorical relations, enhances the total coherence of the user's dialog with the system. Our hypothesis is that the user's understanding of the situation and its implications is increased by the natural language output, which becomes an intermediary between the various possibilities for information presentation.", | |
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| "end": 42, | |
| "text": "Feiner and McKeown (1990)", | |
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| { | |
| "start": 117, | |
| "end": 132, | |
| "text": "Lombardi (1989)", | |
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| "section": "Q Int Interfaces", | |
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| "text": "We are using the KOMET/Penman I system (Mann and Matthiessen, 1983) for generating the natural language output our system requires. KOMET/Penman is a domain-independent text generation system based on systemic-functional grammar (Halliday, 1978) . It consists of extensive grammars of English and German (Matthiessen, 1990; Teich, 1991) , a linguistically motivated ontology, called the Upper Model (Bateman, Kasper, Moore and Whitney, 1989) , a semantic interface that relates the categories of the conceptual ontology with their possible grammatical expressions in English and German (Matthiessen, 1990) , and a basic lexicon containing English and German closed-class items and default lexical realizations for the concepts in the Upper Model ontology. The definition of the lexical items includes morphological information and sets of lexical features that determine the grammatical contexts in which items are to be selected. The Upper Model is the component of the system that is primarily responsible for mediating between the knowledge specific to any given domain and the general lexical and grammatical expressions that are provided by a language. Because it is possible to state how any particular Upper Model concept is to be realized, subordinating domain concepts to particular Upper Model concepts causes those domain concepts to inherit appropriate forms of expression. For example, concepts from the object-class are usually realized as nominal phrases, while concepts from theprocess-class (e.g., mental-process, verbalprocess, action-process, relation-process) are often realized by clauses 2. The relationship between Upper Model and domain model is diagrammed in the context of its application for SIC! in Figure 3 .", | |
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| "text": "(Mann and Matthiessen, 1983)", | |
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| "text": "Figure 3", | |
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| "section": "KOMET/Penman Text Generation System", | |
| "sec_num": "4" | |
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| "text": "Input to the KOMET/Penman text generation system is given in terms of the Sentence Plan Language (Kasper, 1989) , of which we will see examples below. An SPL expression defines the semantic content of a sentence to be generated; it consists of a set of typed variables and relations defined between those variables. Both the types and the possible relations are defined either by the Upper Model directly or by concepts or relations in the domain model that have been subordinated to the Upper Model. In addition to this information, SPL expressions may also contain direct statements in terms of the gramroar's semantic interface --in practical applications these latter are often abbreviated by use of macros (e.g. :tense present) or are defaulted. ", | |
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| "text": "(Kasper, 1989)", | |
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| "section": "KOMET/Penman Text Generation System", | |
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| "text": "To interface SIC! with KOMET/Penman we have to provide several types of knowledge (cf. Figure 3 ) \u2022 A domain model, which is a taxonomy of knowledge specific to our application-domain. We split the domain into two parts: an Information-Domain (I-Domain), which contains concepts related to the information that is shown by SIC!, e.g. workshops and topics (cf. Figure 1 ) , and a Presentation-Domain (P-Domain), which contains concepts related to the way this information is presented by SIC!, e.g. ring, table. By splitting the domain model we increase the adaptability in case of changes in the underlying application domain, e.g. replacing the conference knowledge base with a knowledge base on research projects. Every concept in the domain model has to be linked to some Upper Model concept from which it inherits attributes which enable KOMET/Penman to express the concept in a way that is grammatically correct. The I-Domain concepts can be generated automatically flom the underlying SIC! knowledge bases (cf. Figure 3 ) . Concepts can also be associated to lexical items.", | |
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| "text": "Figure 3 )", | |
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| "text": "Figure 3 )", | |
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| "section": "Interfacing SIC! with the Text Generation System", | |
| "sec_num": "5" | |
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| { | |
| "text": "\u2022 A domain lexicon, containing the definitions of lexicat items of all the words that may appear in the application domain.", | |
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| "section": "Interfacing SIC! with the Text Generation System", | |
| "sec_num": "5" | |
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| { | |
| "text": "6 Creating the Natural Language Output", | |
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| "section": "Interfacing SIC! with the Text Generation System", | |
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| "text": "As stated in our example above, we want to produce text that, in this case, informs the user that not all the information that was requested can be shown because the current presentationform's capacity is limited. Furthermore, we need to offer possible actions which solve this problem. In Figure 4 , we show the semantic input to KOMET/Penman, expressed in SPL, that would cause KOMET/Penman to generate the first sentence that we require: i.e., \"The presentation-form's capacity is exceeded.\" One type of abstract concept that the system requires is the status of a particular entity that may be displayed or used. Possible statuses are, for presentation-forms, exceeded, incomplete. These status concepts can then be attributed to objects by means of the Upper Model relation ascription, which has roles ':domain' and ':range'. They represent the concepts which are related, in our example the presentation-form's capacity and exceeded. In general, ':domain' contains the essential concept of the relation while ':range' contains additional information. The P-Domain concept capacity has been modeled as an object. Figure 5 shows a more complex SPL-plan which demonstrates some of the more advanced possibilities given by KO-MET/Penman. The most interesting aspect in this plan is the use of rhetorical relations based on Rhetorical-Structure-Theory (RST).", | |
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| "text": "Figure 4", | |
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| "text": "Figure 5", | |
| "ref_id": "FIGREF4" | |
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| "section": "Planning Sentences", | |
| "sec_num": "6.1" | |
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| { | |
| "text": "RST is a theory of the organization of natural language texts (Mann and Thompson, 1987) . Mann and Thompson studied a wide variety of English texts and observed that there are approximately 25 relations that usually occur between coherent portions of English text. An RST relation consists of two parts, a nucleus and a satellite. The nucleus is that part that is most essential to the speaker's purpose, while the satellite contains additional information. The satellite is more easily replaced than the nucleus because of the nucleus' central role in the thematical progression of the discourse. Even though there are some critics questioning the use of rhetorical relations in discourse structure theory (Grosz and Sidner, 1986) RST relations because they proved to be quite useful when we link portions of information. In KOMET/Penman, RST-relations are treated the same way as other relations, e.g. ascription which we used in the plan shown in Figure 4 .", | |
| "cite_spans": [ | |
| { | |
| "start": 62, | |
| "end": 87, | |
| "text": "(Mann and Thompson, 1987)", | |
| "ref_id": "BIBREF24" | |
| }, | |
| { | |
| "start": 707, | |
| "end": 731, | |
| "text": "(Grosz and Sidner, 1986)", | |
| "ref_id": "BIBREF13" | |
| } | |
| ], | |
| "ref_spans": [ | |
| { | |
| "start": 950, | |
| "end": 958, | |
| "text": "Figure 4", | |
| "ref_id": null | |
| } | |
| ], | |
| "eq_spans": [], | |
| "section": "Using Rhetorical Relations", | |
| "sec_num": "6.2" | |
| }, | |
| { | |
| "text": "The SPL-plan shown in Figure 5 combines two relations: the ascription-relation, which we used in the SPL-plan in Figure 4 , and the existence-relation. Existence is a so called oneplace-relation, because it contains only a :domain-role but no :range. It is usually realized as \"There is ...\", where :domain defines what exists. We link these two relations via an RSTrelation called rst-nonvolitional-result. This RST-relation implies that the nucleus, which is defined in our :domain-role is a result of the satellite, defined in :range. One possible output is <domain>, because <range>, in our case \"<There are concepts \u2022 ..>, because <... capacity is exceeded>\". Because what is defined in the :domain (\"There are concepts that are not shown\") is not volitional, we use rst-nonvolitional-result instead of rstvolitional-result. The fact that there is data that is not shown by the current presentation-form is essential to our informational purpose. Therefore this fact becomes the nucleus (represented by :domain) of our plan.", | |
| "cite_spans": [], | |
| "ref_spans": [ | |
| { | |
| "start": 22, | |
| "end": 30, | |
| "text": "Figure 5", | |
| "ref_id": "FIGREF4" | |
| }, | |
| { | |
| "start": 113, | |
| "end": 121, | |
| "text": "Figure 4", | |
| "ref_id": null | |
| } | |
| ], | |
| "eq_spans": [], | |
| "section": "Using Rhetorical Relations", | |
| "sec_num": "6.2" | |
| }, | |
| { | |
| "text": "RST-relations which ensure the connectivity between our text segments. Pragmatic coherence is supported by the mere fact that we are using text as a medium for meta-dialogs, as these are difficult to understand on a graphical level.", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Using Rhetorical Relations", | |
| "sec_num": "6.2" | |
| }, | |
| { | |
| "text": "The dialog manager is one of the main components of our interface system (cf. Figure 6 ). It chooses interaction modes (graphic or text) and controls the navigation or exploration in the information space.", | |
| "cite_spans": [], | |
| "ref_spans": [ | |
| { | |
| "start": 78, | |
| "end": 86, | |
| "text": "Figure 6", | |
| "ref_id": "FIGREF5" | |
| } | |
| ], | |
| "eq_spans": [], | |
| "section": "Controlling Multimodal Discourse", | |
| "sec_num": "7" | |
| }, | |
| { | |
| "text": "In order to prevent the user from 'being lost in hyperspace', we guide the user by case-based dialog plans (Tissen, 1991) . In a case-based planning system a new plan will be generated by retrieving the plan which is most appropriate to the user's goals and adapting it dynamically during the ongoing dialog. Two types of adaptations can be distinguished: In'st, system-driven modifications using domain dependent background knowledge, and second, corrections of misconceptions, handled interactively in meta-dialogs with the user.", | |
| "cite_spans": [ | |
| { | |
| "start": 107, | |
| "end": 121, | |
| "text": "(Tissen, 1991)", | |
| "ref_id": "BIBREF38" | |
| } | |
| ], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Controlling Multimodal Discourse", | |
| "sec_num": "7" | |
| }, | |
| { | |
| "text": "The dialog manager detects misconceptions, i.e. situations in which an intended goal cannot be realized, e.g. more items were retrieved than can be displayed in the current presentationform. The corrector operates on knowledge bases of misconceptions and correction rules, e.g. \"if there is a misconception like 'ring presentation: not all requested data can be presented in the ring' and there is no automatic plan modification possible then start a meta-dialog, which informs the user about the situation and offers alternatives.\" Because metadialogs will be handled in text mode, the dialog manager requests the SPL creator to produce SPL plans. Therefore, the dialog manager informs the SPL creator on the current misconception and possible alternatives the user has to choose from to resolve the situation. Then, the SPL creator produces the appropriate SPL plans by combining information on the misconception and possible alternatives with elements from the SPL library. The SPL plans are transformed into natural language text by the KOMET/Penman system. The resulting text is returned to the dialog manager which presents it to the user.", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Controlling Multimodal Discourse", | |
| "sec_num": "7" | |
| }, | |
| { | |
| "text": "In his work on coherence in multi-modal discourse, Bandyopadhyay (Bandyopadhyay, 1990) states that there are three levels of coherence: syntactic coherence, semantic coherence and pragmatic coherence. Syntactic coherence deals with the immediate connectivity among adjacent segments (in texts this is often called text cohesion). Semantic coherence ensures the wellformed thematic organization of a discourse. Discourse segments are connected by semantic ties (Hobbs, 1983 ). Bandyopadhyay defines a discourse to bepragmatically coherent if it is compatible with the addressees' interpretative ability. In our system syntactic coherence is enhanced by the way we present the natural language output in our graphical environment. Semantic coherence is supported by the use of 8 Controlling utterance selection", | |
| "cite_spans": [ | |
| { | |
| "start": 65, | |
| "end": 86, | |
| "text": "(Bandyopadhyay, 1990)", | |
| "ref_id": "BIBREF2" | |
| }, | |
| { | |
| "start": 460, | |
| "end": 472, | |
| "text": "(Hobbs, 1983", | |
| "ref_id": "BIBREF16" | |
| } | |
| ], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Supporting Coherence", | |
| "sec_num": "6.3" | |
| }, | |
| { | |
| "text": "The IGiNG system intends to produce user adapted naturaJ language output. It is an object oriented system consisting ol several object classes (cf. Figure 7 ) When IGiNG is requested to produce an utterance it calls th~ utterance's express method, which In'st builds a list ofplan-ob. jects starting from the initial plan-object given by the utterance object. Then, it is determined whether complex or short state. ments are desired. This information is kept in a user-stereotype and determines in which direction the list of plan-objects is tc be traversed. Now IGiNG tests each plan-object's select condi tions. If all conditions are satisfied, the plan-object is selected otherwise IGiNG tries the succeeding plan-object. Finally th4 plan def'med by the plan-object is passed to the KOMET]Pen man system which generates the utterance. IGiNG is requested to express rood-1. It builds a list of possible plan-objects, which is (plan-1 plan-2). As concise statements are desired, plan-1 is tested first. Because con-1 is not satisfied (it demands that user-level is low while the current user level is advanced) plan-1 is rejected. Next, plan-2 is tested. As all conditions are satisfied, the plan given by plan-2 is generated.", | |
| "cite_spans": [], | |
| "ref_spans": [ | |
| { | |
| "start": 148, | |
| "end": 158, | |
| "text": "Figure 7 )", | |
| "ref_id": "FIGREF6" | |
| } | |
| ], | |
| "eq_spans": [], | |
| "section": "Supporting Coherence", | |
| "sec_num": "6.3" | |
| }, | |
| { | |
| "text": "When a new situations is to be included, the following steps have to be performed:", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Adapting to new situations", | |
| "sec_num": null | |
| }, | |
| { | |
| "text": "A new proposition-instance has to be defined as the successor of an existing proposition-class. If the new proposition is not a part of any of the existing proposition-classes, a new proposition-class should be defined first.", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Adapting to new situations", | |
| "sec_num": null | |
| }, | |
| { | |
| "text": "For any of the possible utterances a parameterizable partial sentence plan has to be written, which is stored in a planobject, together with a reference to the plan-object's select-condition-object. Of course, it is possible to use existing plan-objects, if they are suitable for the intended purpose.", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Adapting to new situations", | |
| "sec_num": null | |
| }, | |
| { | |
| "text": "Finally the plan-objects have to be linked to select-conditions. As these are domain independent, preexisting selectconditions can be reused.", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Adapting to new situations", | |
| "sec_num": null | |
| }, | |
| { | |
| "text": "These are all the steps necessary for defining new propositions. The new objects inherit from their ancestors all the functionality which is necessary for selection and expression.", | |
| "cite_spans": [], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Adapting to new situations", | |
| "sec_num": null | |
| }, | |
| { | |
| "text": "We are going to extend the use of natural language output to other situations which seem to be suited for textual information rather than graphics. We are working on a closer examination of what information has to be included in the user-stereotype and how this knowledge can be obtained. We intend to integrate the conversational roles model approach by Sitter and Stein (1991) , so that we are able to track meta-dialogs, and to incorporate the current work on text planning to further improve the dynamic generation of plan-objects. ", | |
| "cite_spans": [ | |
| { | |
| "start": 355, | |
| "end": 378, | |
| "text": "Sitter and Stein (1991)", | |
| "ref_id": "BIBREF33" | |
| } | |
| ], | |
| "ref_spans": [], | |
| "eq_spans": [], | |
| "section": "Future Work", | |
| "sec_num": "9" | |
| }, | |
| { | |
| "text": "The original Penman system was developed at the Information Science Institute of the University of Southern California; the KOMET system of GMD/IPSI builds on this, working towards multilinguality and enhanced text planning capabilities.z But not always: the existence of, for example, nominalizations motivates the maintenance of two distinct levels of representation,", | |
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| "ref_spans": [], | |
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| "section": "", | |
| "sec_num": null | |
| } | |
| ], | |
| "back_matter": [], | |
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