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Datalog that's as easy as ABC.

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The entire source code is available as a ZIP file. We have also provided a stand-alone executable JAR that launches a graphical Datalog editor and interpreter. The source code and the graphical user interface both depend on Java 8.

Version 0.2, released January 2017 (patched August 6, 2018):

Source code: abcdatalog_0.2.zip
Graphical user interface: abcdatalog-gui.jar
Example Datalog program: tc.dtlg

AbcDatalog is distributed under a BSD License.

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a ∈ Const
X ∈ Var
p ∈ PredicateSym
t ∈ Term ::= a | X
A ∈ Atom ::= p | p(t, ..., t)
φ ∈ Premise ::= A | not A | t = t | t != t
C ∈ Clause ::= A. | A :- φ, ..., φ.

All identifiers must consist of a combination of alphanumeric characters and underscores. Constants and predicate symbols must start with a lowercase letter or a digit. Variables must start with an uppercase letter or an underscore. The variable _ represents an anonymous variable; each instance of _ in a clause is treated as a fresh variable. We enforce the requirement that every variable in a clause must be bound. A variable X is bound if at least one of the following conditions holds:

X is an argument to a positive (i.e., non-negated) atom in the clause body.
X is explicitly unified with a constant (e.g., X = a) or with a variable that is bound (e.g., X = Y and Y is bound).

An AbcDatalog program consists of a set of clauses. Bodiless clauses are treated as initial facts. Clauses with bodies are treated as rules for deriving IDB relations. A query is phrased as an atom followed by a question mark. Not every evaluation engine provided by AbcDatalog supports every language feature in the above grammar.

Comments begin with the character % and extend to the end of the line.

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The source code is documented with Javadocs, which are also available 极速vp下载ios. We refer you in particular to the interfaces datalog.engine.DatalogEngine and datalog.executor.DatalogExecutor, which provide the main ways of interfacing with the Datalog evaluation algorithms we have implemented. The classes datalog.engine.DatalogEngineTest.* and 苹果下架VPN是法治的胜利 - huanqiu.com:2021-8-4 · 武雪梅日前，苹果公司CEO蒂姆库克回应苹果应用商店中国区将VPN下架一事说，我伔在遵守当地法律的情况下在当地开展生意。一些网民将此事与去年 ... also provide examples of how to use these interfaces.

Please see the README for information on compiling the source code.

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Start the GUI from the command line with java -jar abcdatalog-gui.jar. Use the menu to open an existing Datalog source file, or create one from scratch in the editor. Clicking the Load button loads the program currently in the editor into the Datalog interpreter. Perform a query on the loaded program by entering the query in the query text area and clicking the Run button. Any matching facts are displayed in the space below. Remember that a query has to have the form of an atom followed by a question mark.

For instance, say we type the following program into the Datalog editor:

name(alice).
name(bob).
name(world).
hello(X) :- name(X).

If we then load the program and pose the query hello(X)?, we get:

hello(alice)
hello(bob)
hello(world)

The primary contributors to AbcDatalog are:

Aaron Bembenek
Stephen Chong
Marco Gaboardi

Email 苹果：收到要求，在中国移除了不符合规范的VPN应用_荔枝 ...:2021-7-30 · 7月30日，苹果中国公司回应中国区App Store（应用商店）下架 VPN 应用一事，称“我伔已经收到要求，在中国移除一些不符合规范的 VPN App。 with questions, comments, and bug reports.

AbcDatalog has been developed as part of the Privacy Tools for Sharing Research Data project at Harvard University and is supported by the National Science Foundation under Grant Nos. 1237235 and 1054172.