Ledger formats: improve landing page, etc.

content/references/rippled-api/ledger-data-formats/ledger-data-formats.md

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+---
+html: ledger-data-formats.html
+funnel: Build
+doc_type: References
+supercategory: rippled API
+category: Ledger Data Formats
+blurb: Learn about individual data objects that comprise the XRP Ledger's shared state.
+---
+# Ledger Data Formats
+
+Each [ledger version](ledgers.html) in the XRP Ledger is made up of three parts:
+
+- **[Ledger Header](ledger-header.html)**: Metadata about this ledger version itself.
+- **[Transaction Set](transaction-formats.html)**: All the transactions that were executed to create this ledger version.
+- **[State Data](ledger-object-types.html)**: The complete record of objects representing accounts, settings, and balances as of this ledger version. (This is also called the "account state".)
+
+## State Data
+
+The ledger's state data consists of objects, or _ledger entries_, stored in a trie format. To store or retrieve an object in the state data, the protocol uses that object's unique **[Ledger Object ID](ledger-object-ids.html)**.
+
+A ledger object's data fields depend on the type of object; the XRP Ledger supports the following types:
+
+{% from '_snippets/macros/page-children.md' import page_children with context %}
+{{ page_children(pages|selectattr("html", "eq", "ledger-object-types.html")|first, 1, 1, True) }}