Review coordinate limits

ADQL.tex

@@ -1437,16 +1437,6 @@ \subsubsection{Language feature}
 interoperability reasons the IVOID for the geometry features must not have this
 hyphen.
 
-\subsubsection{Coordinate limits}
-\label{sec:functions.geom.limits}
-
-The arguments for a geometric function represent spherical coordinates
-in units of degrees (square degrees for area).
-The values SHOULD be limited to [0, 360] and [-90, 90].
-
-Details of the mechanism for reporting the out of range arguments are
-implementation dependent.
-
 \subsubsection{Datatype functions}
 \label{sec:functions.geom.type}
 
@@ -1490,6 +1480,24 @@ \subsubsection{Datatype functions}
 and \verb:<value_expression_primary>: enables the use of geometric functions
 and column references.
 
+\subsubsection{Coordinate limits}
+\label{sec:functions.geom.limits}
+
+The arguments for a geometric function represent spherical coordinates
+in units of degrees (square degrees for area).
+
+ADQL implementors and users MUST follow coordinate ranges defined in DALI 1.1
+and later.
+
+Note that at the time of the ADQL 2.1 recommendation, no agreed-upon, reliable,
+IVOA-approved convention for what ranges apply to which reference system exists.
+Such convention is foreseen to be defined in DALI. Presently, DALI 1.1 only
+defines ranges for equatorial coordinates. However, this is expected to be
+updated in future DALI versions.
+
+Details of the mechanism for reporting the out of range arguments are
+implementation dependent.
+
 \subsubsection{Coordinate system}
 \label{sec:geom.coordsys.param}
 
@@ -1663,10 +1671,10 @@ \subsubsection{BOX}
 where:
 \begin{itemize}
     \item the center position is given by a pair of numeric coordinates
-    in degrees, or a single geometric POINT
+          in degrees, or a single geometric POINT
+    \item the values of coordinates of the center position are subject to the
+          constraints laid down in \SectionRef{sec:functions.geom.limits}
     \item the width and height are given by numeric values in degrees
-    \item the center position and the width and height MUST be within the ranges defined in
-    \SectionRef{sec:functions.geom.limits}.
 \end{itemize}
 
 For example, a BOX of ten degrees centered on a position
@@ -1740,10 +1748,10 @@ \subsubsection{CIRCLE}
 The function arguments specify the center position and the radius, where:
 \begin{itemize}
     \item the center position is given by a pair of numeric coordinates
-    in degrees, or a single geometric POINT
-    \item the radius is a numeric value in degrees
-    \item the center position and the radius MUST be within the ranges defined in
-    \SectionRef{sec:functions.geom.limits}.
+          in degrees, or a single geometric POINT
+    \item the values of coordinates of the center position are subject to the
+          constraints laid down in \SectionRef{sec:functions.geom.limits}
+    \item the radius is a numeric value in degrees.
 \end{itemize}
 
 For example, a CIRCLE of ten degrees radius centered on position
@@ -2047,8 +2055,8 @@ \subsubsection{POINT}
 The function arguments specify the position, where:
 \begin{itemize}
     \item the position is given by a pair of numeric coordinates in degrees
-    \item the numeric coordinates MUST be within the ranges defined in
-    \SectionRef{sec:functions.geom.limits}.
+    \item the values of coordinates are subject to the constraints laid down in
+          \SectionRef{sec:functions.geom.limits}
 \end{itemize}
 
 For example, a function expressing a point with right ascension of 25 degrees
@@ -2096,10 +2104,10 @@ \subsubsection{POLYGON}
 
 The function arguments specify three or more vertices, where:
 \begin{itemize}
-    \item the position of the vertices are given as a sequence of
-    numeric coordinates in degrees, or as a sequence of geometric POINTs
-    \item the numeric coordinates MUST be within the ranges defined in
-    \SectionRef{sec:functions.geom.limits}
+    \item the position of the vertices are given as a sequence of numeric
+          coordinates in degrees, or as a sequence of geometric POINTs
+    \item the values of coordinates are subject to the constraints laid down in
+          \SectionRef{sec:functions.geom.limits}
 \end{itemize}
 
 For example, a function expressing a triangle with vertices at (10.0,
@@ -2157,9 +2165,9 @@ \subsubsection{REGION}
 
 
 The REGION function provides a way of expressing a complex region
-represented by a single string literal.  The standard expressly only
+represented by a single string literal. The standard expressly only
 requires literals as arguments rather than string expressions or column
-references.  The latter would require parsing these representations
+references. The latter would require parsing these representations
 within the database, which is not intended.
 
 This document does not specify possible syntaxes for REGION literals. A de-facto
@@ -2959,7 +2967,7 @@ \subsection{Between 2.0 and 2.1}
                     \item Clarification about the serialization of geometries in
                           the \verb:SELECT: clause: basically, use the syntax
                           described in DALI \SectionSee{sec:types.geom}
-                    \item Clarification about coordinates limits
+                    \item Clarification about coordinate limits
                           \SectionSee{sec:functions.geom.limits}
                     \item Clarification about geometry types and functions being
                           spherical