axiom | 易学教程

Length function for generic lists

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问题 This post shows how to axiomatise a length function for Z3's built-in lists. However, the function is sort-specific (here Int) and not applicable to lists of bools or custom sorts. ; declare len as an uninterpreted function (declare-fun len ((List Int)) Int) ; assert defining equations for len as an axiom (assert (forall ((xs (List Int))) (ite (= nil xs) (= 0 (len xs)) (= (+ 1 (len (tail xs))) (len xs))))) What would be the smartest way of encoding sort-generic list functions? (If I remember

马斯克要送真人上天！载人龙飞船首秀要载谁？飞多久？

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　　（原标题：SpaceX's historic Demo-2 Crew Dragon astronaut launch: Full coverage）　　作者辰辰　　出品网易科技《知否》栏目组（公众号：tech_163）　　美国东部时间 2020 年 5 月 27 日，埃隆·马斯克（Elon Musk）旗下 SpaceX 公司计划实施第一个载人航天任务。这个名为 Demo-2 的测试任务将通过载人龙飞船把美国国家航空航天局（NASA）宇航员鲍勃·贝恩肯（Bob Behnken）和道格·赫尔利（Doug Hurley）送往国际空间站。　　如果一切顺利，载人龙飞船和 SpaceX 公司的猎鹰 9 号火箭将被证实可执行载人航天任务，而搭载 4 名宇航员的飞船预计将于今年晚些时候发射升空。　　最新情况　　最新卫星照片显示，SpaceX 公司的猎鹰 9 号火箭和载人龙飞船伫立在发射台上，将于当地时间 5 月 27 日周三实施 Demo-2 发射计划。照片拍摄于 5 月 23 日星期六，当时 NASA 和 SpaceX 公司正在进行发射前的彩排。　　目前来看，当天天气良好的概率为 40%。发射时间定于美国东部时间 5 月 27 日下午 4 点 33 分(格林威治标准时间 20 点 33 分)。　　何为载人龙飞船？　　SpaceX 公司研发的载人龙飞船旨在帮助 NASA

Get an InputStream/io.Reader from OMElement object

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问题 I have a OMElement object and from that I want to get an InputStream or reader object. What I want is to stream the xml from the OMElement which I have, without getting loaded into memory. I only could be able to get XMLStreamReader object from that. But I can't find a way to get InputStream/Reader out of that. OMElement element /*I have this object */ XMLStreamReader xmlreader = element.getXMLStreamReaderWithoutCaching(); Can anyone please help me ? I really appreciate! Thanks PS: I have

Hypothetical, formerly-C++0x concepts questions

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问题 ( Preamble: I am a late follower to the C++0x game and the recent controversy regarding the removal of concepts from the C++0x standard has motivated me to learn more about them. While I understand that all of my questions are completely hypothetical -- insofar as concepts won't be valid C++ code for some time to come, if at all -- I am still interested in learning more about concepts, especially given how it would help me understand more fully the merits behind the recent decision and the

How to pass variable parameter into XPath expression?

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问题 I want to pass a parameter into an XPath expression. (//a/b/c[x=?],myParamForXAttribute) Can I do this with XPath 1.0 ? (I tried string-join but it is not there in XPath 1.0) Then how can I do this ? My XML looks like <a> <b> <c> <x>val1</x> <y>abc</y> </c> <c> <x>val2</x> <y>abcd</y> </c> </b> </a> I want to get <y> element value where x element value is val1 I tried //a/b/c[x='val1']/y but it did not work. 回答1: Given that you're using the Axiom XPath library, which in turn uses Jaxen, you

Classcast exception during Rendering while using AXIOM in WAS 8.5.5.2

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问题 I am working on application deployed in WAS 8.5.5.2. I am getting the below error while rendering TIF image. I have kept Axiom 1.2.14 which is latest in classpath and restarted the server. Got a classcast exception. Then, i have searched the entire WAS for any internal builtin jars and found few instances under org.apache.axis2 jar (builtin jar in WAS runtimes folder). SO i have removed my jar from the classpath. Still i am getting the same error. Any clues will really helpful .. Unable to

axis2 “unexpected subelement value”

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问题 I'm trying to use Axis2 to connect to a SOAP webservice. This was previously working in Axis 1, but 2 is causing problems. I've regenerated the Java code using wsdl2java which has generated the stubs for Axis2, but it's falling over when processing an element of the server response with "unexpected subelement value". The fragment of the wsdl document in question is: <complexType name="A"> <sequence> <element name="a" type="xsd:base64Binary" minOccurs="1" maxOccurs="1" nillable="false" />

formal axiomatic def of an example Kripke model in terms of ∀, ∃

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问题 I am looking for a formal axiomatic definition of an example Kripke model in terms of ∀, ∃ assuming knowledge of simple predicate logic, boolean logic,... All descriptions of Kripke models I encounter simply introduce new notations through paraphrasing to english linguistic concepts (i.e. ☐ = "necessity"). While certainly both helpfull and motivating, it does not assure that I will have the same interpretation of what a Kripke model is as someone else. (this question is the result from good

ClassNotFoundException axiom-api-1.2.7.jar

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问题 I am getting this exception in my java project Caused by: java.lang.ClassNotFoundException: org.apache.axiom.om.OMDataSource at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) My classpath is C:\axiom-impl-1.2.7.jar;C:

WSO2 ESB 4.8.1 ERROR White spaces are required between publicId and systemId

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问题 We are working with WSO2 ESB 4.8.1 with JAVA 1.7.0_55. Always, when we start the ESB and make the first request we receive this error: TID: [0] [ESB] [2015-04-22 10:51:31,067] ERROR {org.apache.synapse.transport.passthru.util.RelayUtils} - Error while building Passthrough stream {org.apache.synapse.transport.passthru.util.RelayUtils} org.apache.axiom.om.OMException: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,62] Message: White spaces are required between publicId and