improve XLS validator (#457)

* improve parser

* more cleanup, validation

* mandatory rationale

* simplify more

* Update scripts/validate_xls_template.py

* better error handling

* respond to copilot

* Apply suggestions from code review

Author: mvadari

XLS-0008-tickets/README.md

@@ -6,6 +6,7 @@
   created: 2020-03-01
   proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/23
   status: Withdrawn
+  withdrawal-reason: Superseded by XLS-13
   category: Amendment
 </pre>
 

XLS-0010-non-transferable-tokens/README.md

@@ -1,6 +1,7 @@
 <pre>
     xls: 10
     title: Non-Transferable Token (NTT) standard
+    description: A standard for non-transferable tokens on the XRP Ledger
     author: RichardAH (@RichardAH)
     proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/20
     created: 2020-04-05

XLS-0015-concise-tx-id/README.md

@@ -6,6 +6,7 @@
   created: 2021-03-09
   proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/34
   status: Withdrawn
+  withdrawal-reason: Superseded by XLS-37
   category: System
 </pre>
 

XLS-0016-nft-metadata/README.md

@@ -1,11 +1,12 @@
 <pre>
-    xls: 16
-    title: NFT Metadata
-    author: Hubert Getrouw (@HubertG97)
-    created: 2021-03-17
-    proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/37
-    status: Stagnant
-    category: Ecosystem
+  xls: 16
+  title: NFT Metadata
+  description: Standard for NFT metadata
+  author: Hubert Getrouw (@HubertG97)
+  created: 2021-03-17
+  proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/37
+  status: Stagnant
+  category: Ecosystem
 </pre>
 
 In addition to @WietseWind 's [XLS-14](https://github.com/XRPLF/XRPL-Standards/discussions/30) and @RichardAH 's proposal [XLS-15](../XLS-0015-concise-tx-id/README.md) here is a proposal to create a standard for the creation of metadata for the tokens created with a CTI in the currency code.

XLS-0017-xfl/README.md

@@ -1,7 +1,7 @@
 <pre>
     xls: 17
     title: XFL Developer-friendly representation of XRPL balances
-    descrption: Introduces developer-friendly representation of XRPL balances.
+    description: Introduces developer-friendly representation of XRPL balances.
     author: RichardAH (@RichardAH)
     proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/39
     created: 2021-03-19

XLS-0051-nftoken-escrow/README.md

@@ -1,11 +1,12 @@
 <pre>
   xls: 51
   title: NFToken Escrows
+  description: Extension to Escrow functionality to support escrowing NFTokens
   author: Mayukha Vadari (@mvadari)
-  created: 2023-11-17
   proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/146
   status: Stagnant
   category: Amendment
+  created: 2023-11-17
 </pre>
 
 # NFToken Escrows

XLS-0101-smart-contracts/README.md

@@ -4,7 +4,7 @@
   created: 2025-07-28
   author: Mayukha Vadari (@mvadari), Denis Angell (@dangell7)
   proposal-from: https://github.com/XRPLF/XRPL-Standards/discussions/271
-  status: Proposal
+  status: Draft
   category: Amendment
 </pre>