axiom

Why can't programs be proven?

由 我的梦境 提交于 2019-12-03 18:19:52
问题 Why can't a computer program be proven just as a mathematical statement can? A mathematical proof is built up on other proofs, which are built up from yet more proofs and on down to axioms - those truths truths we hold as self evident. Computer programs don't seem to have such a structure. If you write a computer program, how is it that you can take previous proven works and use them to show the truth of your program? You can't since none exist. Further, what are the axioms of programming?

Hypothetical, formerly-C++0x concepts questions

由 拥有回忆 提交于 2019-12-03 05:56:17
( 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 controversy that has followed) After having read some introductory material on concepts as C++0x (until

How do you Change a Package's Log Level using Log4j?

由 不打扰是莪最后的温柔 提交于 2019-11-29 22:47:32
I've encountered the following bug: http://issues.apache.org/jira/browse/AXIS2-4363 It states the following: This error only occurs when log level for org.apache.axiom is DEBUG so a workaround is to set log level > DEBUG. My question is HOW do I go about doing that? I've been scouring my directories for a properties file or something and I've been looking to see if there was something I could set in code, but I really have no idea what I'm doing. I'm running a console app on my desktop right now while trying to get this to work. Update 1: I noticed that my Axis2 directory has its own log4j

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

由 烂漫一生 提交于 2019-11-29 17:08:19
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 systemId. at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296) at org.apache

How do you Change a Package's Log Level using Log4j?

由 耗尽温柔 提交于 2019-11-28 19:30:24
问题 I've encountered the following bug: http://issues.apache.org/jira/browse/AXIS2-4363 It states the following: This error only occurs when log level for org.apache.axiom is DEBUG so a workaround is to set log level > DEBUG. My question is HOW do I go about doing that? I've been scouring my directories for a properties file or something and I've been looking to see if there was something I could set in code, but I really have no idea what I'm doing. I'm running a console app on my desktop right

How to pass variable parameter into XPath expression?

由 China☆狼群 提交于 2019-11-26 15:33:42
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. Given that you're using the Axiom XPath library, which in turn uses Jaxen, you'll need to follow the following three steps to do this in a thoroughly robust manner: Create a
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