Clarify uses of value used in KHR specs

If a value's use is adopted by a KHR extension or
spec, then it's as if the value were originally
reserved in a Khronos ragne.  Khronos permanently
fixes that use.

diff --git a/include/spirv/spir-v.xml b/include/spirv/spir-v.xml
index 7a301a6..f87bf28 100644 (file)
--- a/include/spirv/spir-v.xml
+++ b/include/spirv/spir-v.xml
@@ -70,7 +70,10 @@
          accordingly.
 
          Each vendor determines the use of values in their own ranges.
-         Vendors are not required to disclose those uses.
+         Vendors are not required to disclose those uses.  If the use of a
+         value is included in an extension which is adopted by a Khronos
+         extension or specification, then that value's use may be permanently
+         fixed as if originally reserved in a Khronos range.
 
          The SPIR Working Group strongly recommends:
          - Each value is used for only one purpose.