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[Semantic Web]了解 DIG ， 一个调用DL Reasoner的接口？ 读书笔记,  日后处理,  科学研究 Sean Bechhofer. The dig description logic interface: Dig/1.1. In Proceedings of the 2003 Description Logic Workshop (DL 2003), 2003.   1 Introduction Most description logic (DL) systems present the application programmer with a functional interface, often defined using a Lisp-like syntax. Such interfaces may be more or less complex, depending on the sophistication of the implemented system, and may be more or less compliant with a specification such as KRSS [11]. The Lisp style of the KRSS syntax reflects the fact that Lisp is still the most common implementation language for DLs. This can create considerable barriers to the use of DL systems by application developers, who often prefer other languages (in particular the currently ubiquitous Java), and who are becoming more accustomed to component based software development environments. This is of increasing importance given current interest in Web Services and service based architectures. In such an environment, a DL might naturally be viewed as a self contained component, with implementation details, and even the precise location in which its code is being executed, being hidden from the application [3]. This approach has several advantages: the issue of implementation language is finessed; the API can be defined in some standard formalism intended for the purpose; a mechanism is provided for applications to communicate with the DL 徐涵（Han Xu） 发表于 2004/12/20 23:53:20 | 阅读全文(4039) | 回复(0) | 编辑 | 精华 | 删除

[Semantic Web]Instance Store 读书笔记,  科学研究 2.2 Precompletion One of the techniques for tackling the ABox reasoning is the precompletion algo- rithm, this technique is to split the KB satisability algorithm in two parts. In the rst part all the information implicit in the role assertions is made explicit, generating what we call a \precompletion" of the knowledge base, then a termi- nological reasoner is used for verifying the consistency of the concept assertions for each individual name [5, 6]. The work presented in [12] extended the precompletion algorithm for Knowl- edge Base satiability to the DL language SHF. The main advantages of this approach are its ability of using existing highly optimised TBox reasoners, and the fact that it may be able to handle very large ABox by partitioning them into disconnected parts. However, the logic concerned in [12] is a subset of that required by Semantic Web knowledge representation languages such as OWL, and it is not easy to see how the technique can be extended to deal with more expressive languages. Besides, as we stated in the motivation, we will be facing a huge amount of service advertisements which might be more challenging for the traditional ABox reasoning. Therefore, we chose an alternative approach | the instance store. 2.3 Instance Store A instance store provides weaker functinality than a full ABox, but which is probably sucient to support a number of app 徐涵（Han Xu） 发表于 2004/12/20 23:52:00 | 阅读全文(3039) | 回复(0) | 编辑 | 精华 | 删除

[Semantic Web]RDF/RDFS Class-Property Graph 读书笔记,  科学研究 徐涵（Han Xu） 发表于 2004/12/19 13:51:58 | 阅读全文(3226) | 回复(0) | 编辑 | 精华 | 删除

[Semantic Web]rdfs:comment 和 rdfs:label的区别 读书笔记,  科学研究 {{ RDF Primer , 5.4 Other Schema Information For example the rdfs:comment property can be used to provide a human-readable description of a resource. The rdfs:label property can be used to provide a more human-readable version of a resource's name. }} 举例： <rdfs:Class rdf:ID="PowerSystemResource">   <rdfs:label xml:lang="en">PowerSystemResource</rdfs:label>   <rdfs:comment>"A power system component that can be either an     individual element such as a switch or a set of elements     such as a substation. PowerSystemResources that are sets     could be members of other sets. For example a Switch is a     member of a Substation and a Substation could be a member     of a division of a Company"</rdfs:comment> </rdfs:Class>   徐涵（Han Xu） 发表于 2004/12/18 19:31:19 | 阅读全文(3190) | 回复(0) | 编辑 | 精华 | 删除

[Semantic Web]关于RDF/XML中， rdfs:range的用法 读书笔记,  科学研究 　 {{ RDF Primer  5.2 Describing Properties The rdfs:range property is used to indicate that the values of a particular property are instances of a designated class. For example, if example.org wanted to indicate that the property ex:author had values that are instances of class ex:Person, it would write the RDF statements: ex:Person rdf:type rdfs:Class . ex:author rdf:type rdf:Property . ex:author rdfs:range ex:Person . These statements indicate that ex:Person is a class, ex:author is a property, and that RDF statements using the ex:author property have instances of ex:Person as objects. ...... [snip] ...... The rdfs:range property can also be used to indicate that the value of a property is given by a typed literal, as discussed in Section 2.4. For example, if example.org wanted to indicate that the property ex:age 徐涵（Han Xu） 发表于 2004/12/18 17:02:31 | 阅读全文(2598) | 回复(0) | 编辑 | 精华 | 删除

[SWS]Profile-based Class Hierarchies 文章收藏,  读书笔记,  科学研究 转载自: http://www.daml.org/services/owl-s/1.1/ProfileHierarchy.html Profile-based Class Hierarchies Explanatory remarks for ProfileHierarchy.owl OWL-S 1.1 As explained in the Technical Overview and elsewhere, a service profile is used to characterize a service for purposes such as advertisement, discovery, and selection. Service profiles may be published in various kinds of registries, discovered using various tools, and selected using various kinds of matchmaking techniques. OWL-S does not prescribe or limit the ways in which profiles may be used, but rather, seeks to provide a basis for their construction that is flexible enough to accommodate many different contexts and methods of use. In general, this kind of service characterization must effectively position a service within the broad array of services that exists within some domain, or perhaps in the world at large. One very natural technique for this kind of positioning is the construction of a class hierarchy, with inheritance of properties by subclasses. This fundamental technique, which is a familiar part of object-oriented design and programming, is also well supported by OWL and other description logic-based markup languages. This technique, when used to construct a hierarchy of subclasses of the Profile class, p 徐涵（Han Xu） 发表于 2004/12/17 23:26:02 | 阅读全文(3795) | 回复(0) | 编辑 | 精华 | 删除

[Web Services]A java based API for OWL-S 1.1 by SemWebCentral.org 网上资源,  科学研究 转载自: http://projects.semwebcentral.org/projects/owl-s-api/ A java based API for OWL-S Environment: Console (Text Based) Interface: API Programming Language: Java Semantic Web Tool Categories: API 徐涵（Han Xu） 发表于 2004/12/17 11:26:59 | 阅读全文(4708) | 回复(0) | 编辑 | 精华 | 删除

[Semantic Web]RDF中使用xml:lang的注意点 读书笔记,  科学研究 http://www.w3.org/TR/2004/REC-rdf-syntax-grammar-20040210/ RDF/XML permits the use of the xml:lang attribute as defined by 2.12 Language Identification of XML 1.0 [XML] to allow the identification of content language. The xml:lang attribute can be used on any node element or property element to indicate that the included content is in the given language. Typed literals which includes XML literals are not affected by this attribute. The most specific in-scope language present (if any) is applied to property element string literal content or property attribute values. The xml:lang="" form indicates the absence of a language identifier. http://www.w3.org/TR/2004/REC-rdf-concepts-2 徐涵（Han Xu） 发表于 2004/12/16 18:15:41 | 阅读全文(3391) | 回复(0) | 编辑 | 精华 | 删除

[Semantic Web]RDF中的数据类型 ： XML Schema Datatypes + rdf:XMLLiteral 读书笔记,  科学研究 RDF中的数据类型由两部分组成：XML Schema built-in Datatypes 及 RDF built-in Datatype -- rdf:XMLLiteral。 {{ RDF uses the datatype abstraction defined by XML Schema Part 2: Datatypes [XML-SCHEMA2], and may be used with any datatype definition that conforms to this abstraction, even if not actually defined in terms of XML Schema. RDF predefines just one datatype rdf:XMLLiteral, used for embedding XML in RDF (see section 5).  }}   {{ // http://www.w3.org/TR/2004/REC-owl-ref-20040210/#rdf-datatype Data values are instances of the RDF Schema class rdfs:Literal. Literals can be either plain (no datatype) or typed. Datatypes are instances of the class rdfs:Datatype. In RDF/XML, the type of a literal is specified by an rdf:datatype attribute of which the value is recommended to be one of the following: A canonical URI reference to an XML Schema datatype of the form: http://www.w3.org/2001/XMLSchema#NAME where "NAME" sh 徐涵（Han Xu） 发表于 2004/12/16 17:36:09 | 阅读全文(2553) | 回复(0) | 编辑 | 精华 | 删除

1.1 What is ruby? 文章收藏,  科学研究 转载自: http://www.w3.org/TR/2001/REC-ruby-20010531/#what 1.1 What is ruby? Ruby is the term used for a run of text that is associated with another run of text, referred to as the base text. Ruby text is used to provide a short annotation of the associated base text. It is most often used to provide a reading (pronunciation guide). Ruby annotations are used frequently in Japan in many kinds of publications, including books and magazines. Ruby is also used in China, especially in schoolbooks. Ruby text is usually presented alongside the base text, using a smaller typeface. The name "ruby" in fact originated from the name of the 5.5pt font size in British printing, which is about half the 10pt font size commonly used for normal text. Figure 1.1 shows an example, with three ideographs (kanji) as base text, and six hiragana giving the reading (shinkansen - Japanese bullet train). 徐涵（Han Xu） 发表于 2004/12/16 17:11:51 | 阅读全文(1792) | 回复(0) | 编辑 | 精华 | 删除

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