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<H1> A.2 The Package Ada</H1>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> The following language-defined
library package exists: </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Examples"><TT><A NAME="I4810"></A><A NAME="I4811"></A><B>package</B> Ada <B>is</B><BR>
<B>pragma</B> Pure(Ada);<BR>
<B>end</B> Ada;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Normal"> Ada serves as the parent of most of the other
language-defined library units; its declaration is empty (except for
the <FONT FACE="Arial, Helvetica">pragma</FONT> Pure). </DIV>
<H4 ALIGN=CENTER>Legality Rules</H4>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Normal"> In the standard mode, it is illegal to compile
a child of package Ada. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Reason: </B>The intention is
that mentioning, say, Ada.Text_IO in a <FONT FACE="Arial, Helvetica">with_clause</FONT>
is guaranteed (at least in the standard mode) to refer to the standard
version of Ada.Text_IO. The user can compile a root library unit Text_IO
that has no relation to the standard version of Text_IO. </FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4.b</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Ramification: </B>Note that
Ada can have non-language-defined grandchildren, assuming the implementation
allows it. Also, packages System and Interfaces can have children, assuming
the implementation allows it. </FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4.c</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Implementation Note: </B>An
implementation will typically support a nonstandard mode in which compiling
the language defined library units is allowed. Whether or not this mode
is made available to users is up to the implementer.</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4.d</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1>An implementation could theoretically
have private children of Ada, since that would be semantically neutral.
However, a programmer cannot compile such a library unit. </FONT></DIV>
<H4 ALIGN=CENTER>Extensions to Ada 83</H4>
<DIV Class="Paranum"><FONT SIZE=-2>4.e</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><A NAME="I4812"></A>This clause
is new to Ada 95. </FONT></DIV>
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