ttools: provide taplint with VOSITables schema

taplint was generating the following warning when validating the
/tables endpoint for some services:

   W-TMV-UNSC-1 Schema from unknown namespace during validation: http://www.ivoa.net/xml/VOSITables/v1.0

I'm not sure why I hadn't noticed this before, or why I hadn't included
the VOSITables schema in taplint's hardwired schema collection before.
Anyway, I have now, so this warning will go away.

NOTE, as pointed out to me by Gregory Mantelet, and earlier
(July 2014) noted by Markus Demleitner on the grid@ivoa.net list,
there appears to be an error in the copy of that schema currently
(29 Oct 2014) hosted at the canonical location
(http://www.ivoa.net/xml/VOSITables/v1.0) - it's got its namespaces
in a twist.  Maybe that's the reason I didn't include it before.

Therefore the VOSITables-v1.0.xsd schema included in this commit
has been copied'n'pasted from the VOSI 1.0 REC standard text
(Appendix A.3), with some whitespace formatting errors and
annoyances adjusted.

ttools/src/docs/sun256.xml

@@ -9870,6 +9870,8 @@ eds. C. Gabriel et al., ASP Conf. Ser. 351, p. 666 (2006)
     <li>Add (experimental) read-only support for Gaia/DPAC GBIN format.</li>
     <li>Fix <code>taplint</code> to permit application/xml
         not just text/xml content-type where appropriate (UWS stage).</li>
+    <li>Fix <code>taplint</code> so it doesn't warn (W-TMV-UNSC) about
+        unknown VOSITables schema.</li>
     </ul>
     </p></dd>
 

ttools/src/main/uk/ac/starlink/ttools/taplint/IvoaSchemaResolver.java

@@ -36,6 +36,7 @@ public class IvoaSchemaResolver implements LSResourceResolver {
     /** Namespace URI for VOSI availability schema. */
     public static final String AVAILABILITY_URI;
 
+    private static final String TABLES_URI;
     private static final String VORESOURCE_URI;
     private static final String TAPREGEXT_URI;
     private static final String STC_URI;
@@ -56,6 +57,9 @@ public class IvoaSchemaResolver implements LSResourceResolver {
         map.put( AVAILABILITY_URI =
                  "http://www.ivoa.net/xml/VOSIAvailability/v1.0",
                  base.getResource( "VOSIAvailability-v1.0.xsd" ) );
+        map.put( TABLES_URI =
+                 "http://www.ivoa.net/xml/VOSITables/v1.0",
+                 base.getResource( "VOSITables-v1.0.xsd" ) );
         map.put( VORESOURCE_URI =
                  "http://www.ivoa.net/xml/VOResource/v1.0",
                  base.getResource( "VOResource-v1.0.xsd" ) );

ttools/src/resources/uk/ac/starlink/ttools/taplint/VOSITables-v1.0.xsd

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsd:schema targetNamespace="http://www.ivoa.net/xml/VOSITables/v1.0"
+  xmlns:tns="http://www.ivoa.net/xml/VOSITables/v1.0"
+  xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0"
+  xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1"
+  xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  elementFormDefault="qualified"
+  attributeFormDefault="unqualified"
+  version="1.0">
+
+  <xsd:annotation>
+    <xsd:documentation>
+     A schema for formatting table metadata as returned by a 
+     tables resource, defined by the IVOA Support Interfaces 
+     specification (VOSI). 
+     See http://www.ivoa.net/Documents/latest/VOSI.html.  
+    </xsd:documentation>
+  </xsd:annotation>
+
+  <xsd:import namespace="http://www.ivoa.net/xml/VODataService/v1.1"
+    schemaLocation="http://www.ivoa.net/xml/VODataService/v1.1" />
+
+  <!--
+    -  the root element for a VOSI table metadata (section 3.4)
+    -->
+  <xsd:element name="tableset" type="vs:TableSet" >
+    <xsd:annotation>
+      <xsd:documentation>
+        A description of the table metadata supported by the 
+        service associated with a VOSI-enabled resource.
+      </xsd:documentation>
+    </xsd:annotation>
+  </xsd:element>
+
+</xsd:schema>