update index.adoc w.r.t. version V3.1.1 and date July 25

+ add hint to use bugfixes for dependent parts

Author: BirgitBoss

documentation/IDTA-01001/modules/ROOT/pages/index.adoc

@@ -16,17 +16,18 @@ This specification is part of the https://industrialdigitaltwin.org/en/content-h
 
 == Version
 
-This is version 3.1 of the specification IDTA-01001.
+This is version 3.1.1 of the specification IDTA-01001.
 
-Previous version: 3.0.2
+Previous version: 3.1
 
 [#metamodel-versions]
 == Dependencies
 
-For the schemas derived from this document (version 3.1) there is a dependency to the following parts of the “Specification of the Asset Administration Shell” series:
+For the schemas derived from this document there is a dependency to the following parts of the “Specification of the Asset Administration Shell” series:
 
 * IDTA-01003-a Part 3a: Data Specification – IEC 61360 in version 3.1 xref:bibliography.adoc#bib46[[46\]]
 
+If there is a bugfix of this parts, this shall be used.
 
 == Notice
 
@@ -41,7 +42,7 @@ https://creativecommons.org/licenses/by/4.0/[Creative Commons Attribution 4.0 In
 
 SPDX-License-Identifier: CC-BY-4.0
 
-May 2025
+July 2025
 
 == How to Get in Contact