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Re: On Quantity - Measurement relationship

  • From: Martin Desruisseaux < >
  • To:
  • Subject: Re: On Quantity - Measurement relationship
  • Date: Sun, 02 Nov 2014 00:54:04 +0900
  • Organization: Geomatys

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    Le 02/11/14 00:37, Werner Keil a écrit :<br>
    <blockquote
cite="mid:CAAGawe36-T1922O4_o9rJrhMyiA4tVA59ipcC-D6U_LVx=
      "
      type="cite">
      <div dir="ltr">That's part of the Spec, while some terms there
        (OK, "Measurable" was already purged<img
          src="cid:part1.07060400.00070608@geomatys.fr" goomoji="338"
          style="margin: 0px 0.2ex; vertical-align: middle;">) may be
        influenced by JSR 275 or the prior Unit-API<br>
      </div>
    </blockquote>
    <p>Okay, there is a copy and paste of our spec (emphasis are mine):<br>
    </p>
    <blockquote>
      <p><b>Quantity:</b> Any type of <u><b>quantitative</b></u>
        property or attribute of a thing. For example, 'temperature',
        'volume', 'pressure', 'molecular mass' and 'internal energy' are
        quantitative properties which can be used to describe the state
        of a confined gas. A unit is not needed to express a quantity.
        For example, Alice can quantify the mass of her shoe by handling
        it. A unit is not needed to do quantitative arithmetic, either. 
        Alice can add the mass of her left shoe and the mass of her
        right shoe by placing them both in the pan of a balance. Units
        are needed to represent measurable quantities in a computer, on
        paper, on a network, etc. <b>In this API, quantities are
          restricted to the measurable ones: only the quantities that
          can be expressed as the combination of a numerical value and a
          unit are supported.</b>  This is sometime considered as a
        partial definition of Measure rather than Quantity. 
        Nevertheless this API uses the “quantity” term for consistency
        with usage in other frameworks, because the concept of quantity
        is needed anyway for units parametrization, and for avoiding the
        introduction of both concepts in the library.<br>
      </p>
    </blockquote>
    <p>I agree with the current spec definition. To me, the Quantity
      type in JSR-363 is a <i>quantitative measurement</i>, not a
      quantity in the sense that Jean-Marie said (Jean-Marie point of
      view is totally valid, but the specification approach is more
      specialized).<br>
    </p>
    <p>So I think that the current hierarchy is conform to the spec.<br>
    </p>
    <p>    Martin<br>
      <br>
    </p>
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Re: On Quantity - Measurement relationship

(continued)

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Jean-Marie Dautelle 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Martin Desruisseaux 11/01/2014

Re: On Quantity - Measurement relationship

Werner Keil 11/01/2014
 
 
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