The problem comes when you want to do something that cannot be described by the declarative language.
At this point the declarative model must have an escape hatch to allow programming to take place.
Clojure statements can be used to perform bits of transformation that have yet to be represented by the declarative language.
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Another interesting feature of Cascalog is that it allows imperative programming to be inserted into the declarative system if it is needed.
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You have left the declarative model at that point, and the site is yours to maintain, but you can do anything that coding allows.
The challenge in the declarative model is to think of everything.
By sticking with the declarative model, Drupal Gardens can upgrade layers of software in the background with minimal disruption to the users, who do not have to worry about upgrades.
My favorite flavor of configuration is the declarative model.
Puppet has followed the evolution of most declarative systems such as HTML or SQL. At first, basic needs could be expressed in the declarative language, but as the nature of the work being performed became better understood, the declarative language became more powerful and could describe more complex and sophisticated results.
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The Cascalog system has combined the Cascading system for abstraction of advanced data processing on Hadoop and other systems, the Datalog declarative programming language that is well suited for expressing database queries in an abstract form, and the Clojure language to create a declarative language for queries that can be run on Apache Hadoop.
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While it is very possible to read or see the first two declarative aspects, the assumptions are the foundational elements that lead to secrets of success.
Just listen to the opening, pounding, declarative timpani at the start of this symphony (audio).
Because the ruling was declarative rather than injunctive, there is no immediate impact and none is expected until the question lands at the Supreme Court where the matter will be finally decided.
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The key to creating a powerful declarative system is the ability to create abstractions of more complicated work.
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It is -- I mean, I think the DNI spokesman was very declarative about this that the report is false.
One of the early indications that the one-way street is heading for a dead end is the ratio of declarative statements to questions.
Puppet Labs is the developer of Puppet, software that applies declarative programming to the task of system administration of compute, network, and storage infrastructure in traditional data centers or in the cloud.
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He would no longer insist on a declarative end of the conflict.
Like Winston Churchill, Harvey knew the power of brief, declarative sentences.
Through declarative programming, Puppet allows the complexity inherent in the modern computing environments to be tamed and automated.
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Dries Buytaert, the Belgian wunderkind who created Drupal, started Drupal Gardens because he saw that Software as a Service could be combined with a declarative configuration model to make the process of creating web sites so much easier.
They speak their declarative sentences with rising inflection at the ends, forming questions rather than statements.
And you certainly do not make declarative statements regarding factual scenarios of which the listener was unaware.
This led Dr Milner to propose a distinction between procedural memory (memory for a skill) and declarative memory (conscious recall of having used that skill), and to suggest that the two are stored in different places.
Puppet does this work by providing system administrators a declarative language that allows a configuration file to be described and then filled in differently based on the role that the computer on which the configuration file exists is playing.
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The state of the art in this model of programming is Pegasystems, which is often called a BPM system but is really a declarative application development environment.
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