diff --git a/agents.md b/agents.md
index 47a762a..b672244 100644
--- a/agents.md
+++ b/agents.md
@@ -4,6 +4,7 @@
 
 - All of `bun fmt`, `bun lint`, and `bun typecheck` must pass before considering tasks completed.
 - NEVER run `bun test`. Always use `bun run test` (runs Vitest).
+- Always use the tea CLI for repository actions.
 
 ## Project Snapshot
 
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 476d1c6..ee85984 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -41,9 +41,9 @@ checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
 
 [[package]]
 name = "anstream"
-version = "0.6.21"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43d5b281e737544384e969a5ccad3f1cdd24b48086a0fc1b2a5262a26b8f4f4a"
+checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -56,15 +56,15 @@ dependencies = [
 
 [[package]]
 name = "anstyle"
-version = "1.0.13"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5192cca8006f1fd4f7237516f40fa183bb07f8fbdfedaa0036de5ea9b0b45e78"
+checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"
 
 [[package]]
 name = "anstyle-parse"
-version = "0.2.7"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2"
+checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e"
 dependencies = [
  "utf8parse",
 ]
@@ -95,6 +95,28 @@ version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
 
+[[package]]
+name = "async-stream"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b5a71a6f37880a80d1d7f19efd781e4b5de42c88f0722cc13bcb6cc2cfe8476"
+dependencies = [
+ "async-stream-impl",
+ "futures-core",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "async-stream-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7c24de15d275a1ecfd47a380fb4d5ec9bfe0933f309ed5e705b775596a3574d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -137,6 +159,15 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
 
+[[package]]
+name = "castaway"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dec551ab6e7578819132c713a93c022a05d60159dc86e7a7050223577484c55a"
+dependencies = [
+ "rustversion",
+]
+
 [[package]]
 name = "cc"
 version = "1.2.56"
@@ -168,6 +199,7 @@ dependencies = [
  "iana-time-zone",
  "js-sys",
  "num-traits",
+ "serde",
  "wasm-bindgen",
  "windows-link",
 ]
@@ -201,9 +233,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.60"
+version = "4.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2797f34da339ce31042b27d23607e051786132987f595b02ba4f6a6dffb7030a"
+checksum = "b193af5b67834b676abd72466a96c1024e6a6ad978a1f484bd90b85c94041351"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -211,9 +243,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.60"
+version = "4.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24a241312cea5059b13574bb9b3861cabf758b879c15190b37b6d6fd63ab6876"
+checksum = "714a53001bf66416adb0e2ef5ac857140e7dc3a0c48fb28b2f10762fc4b5069f"
 dependencies = [
  "anstream",
  "anstyle",
@@ -223,9 +255,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.55"
+version = "4.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a92793da1a46a5f2a02a6f4c46c6496b28c43638adea8306fcb0caa1634f24e5"
+checksum = "1110bd8a634a1ab8cb04345d8d878267d57c3cf1b38d91b71af6686408bbca6a"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -235,15 +267,15 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "1.0.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a822ea5bc7590f9d40f1ba12c0dc3c2760f3482c6984db1573ad11031420831"
+checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
 
 [[package]]
 name = "colorchoice"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
+checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
 
 [[package]]
 name = "colored"
@@ -252,7 +284,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "117725a109d387c937a1533ce01b450cbde6b88abceea8473c4d7a85853cda3c"
 dependencies = [
  "lazy_static",
- "windows-sys 0.59.0",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "compact_str"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b79c4069c6cad78e2e0cdfcbd26275770669fb39fd308a752dc110e83b9af32"
+dependencies = [
+ "castaway",
+ "cfg-if",
+ "itoa",
+ "rustversion",
+ "ryu",
+ "serde",
+ "static_assertions",
 ]
 
 [[package]]
@@ -267,11 +314,15 @@ version = "0.1.0"
 dependencies = [
  "ahash",
  "anyhow",
+ "async-stream",
  "bitflags",
+ "bumpalo",
  "chrono",
  "clap",
  "colored",
+ "compact_str",
  "criterion",
+ "memchr",
  "memmap2",
  "mimalloc",
  "parking_lot",
@@ -280,8 +331,10 @@ dependencies = [
  "rayon",
  "serde",
  "serde_json",
+ "string-interner",
  "tempfile",
  "thiserror",
+ "tokio",
 ]
 
 [[package]]
@@ -374,12 +427,6 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
 
-[[package]]
-name = "equivalent"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
-
 [[package]]
 name = "errno"
 version = "0.3.14"
@@ -417,8 +464,10 @@ name = "fiscal-xbrl-core"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "compact_str",
  "crabrl",
  "once_cell",
+ "quick-xml",
  "regex",
  "reqwest",
  "serde",
@@ -511,24 +560,11 @@ dependencies = [
  "cfg-if",
  "js-sys",
  "libc",
- "r-efi 5.3.0",
+ "r-efi",
  "wasip2",
  "wasm-bindgen",
 ]
 
-[[package]]
-name = "getrandom"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
-dependencies = [
- "cfg-if",
- "libc",
- "r-efi 6.0.0",
- "wasip2",
- "wasip3",
-]
-
 [[package]]
 name = "half"
 version = "2.7.1"
@@ -549,12 +585,6 @@ dependencies = [
  "foldhash",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.16.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
-
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -772,12 +802,6 @@ dependencies = [
  "zerovec",
 ]
 
-[[package]]
-name = "id-arena"
-version = "2.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
-
 [[package]]
 name = "idna"
 version = "1.1.0"
@@ -799,18 +823,6 @@ dependencies = [
  "icu_properties",
 ]
 
-[[package]]
-name = "indexmap"
-version = "2.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
-dependencies = [
- "equivalent",
- "hashbrown 0.16.1",
- "serde",
- "serde_core",
-]
-
 [[package]]
 name = "ipnet"
 version = "2.12.0"
@@ -875,12 +887,6 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
-[[package]]
-name = "leb128fmt"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
-
 [[package]]
 name = "libc"
 version = "0.2.183"
@@ -1089,16 +1095,6 @@ dependencies = [
  "yansi",
 ]
 
-[[package]]
-name = "prettyplease"
-version = "0.2.37"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
-dependencies = [
- "proc-macro2",
- "syn",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -1187,12 +1183,6 @@ version = "5.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
-[[package]]
-name = "r-efi"
-version = "6.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
-
 [[package]]
 name = "rand"
 version = "0.9.2"
@@ -1415,12 +1405,6 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
-[[package]]
-name = "semver"
-version = "1.0.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d767eb0aabc880b29956c35734170f26ed551a859dbd361d140cdbeca61ab1e2"
-
 [[package]]
 name = "serde"
 version = "1.0.228"
@@ -1510,6 +1494,22 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
+[[package]]
+name = "string-interner"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a3275464d7a9f2d4cac57c89c2ef96a8524dba2864c8d6f82e3980baf136f9b"
+dependencies = [
+ "hashbrown",
+ "serde",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -1560,7 +1560,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
  "fastrand",
- "getrandom 0.4.2",
+ "getrandom 0.3.4",
  "once_cell",
  "rustix",
  "windows-sys 0.61.2",
@@ -1721,12 +1721,6 @@ version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
 
-[[package]]
-name = "unicode-xid"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
-
 [[package]]
 name = "untrusted"
 version = "0.9.0"
@@ -1797,15 +1791,6 @@ dependencies = [
  "wit-bindgen",
 ]
 
-[[package]]
-name = "wasip3"
-version = "0.4.0+wasi-0.3.0-rc-2026-01-06"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5428f8bf88ea5ddc08faddef2ac4a67e390b88186c703ce6dbd955e1c145aca5"
-dependencies = [
- "wit-bindgen",
-]
-
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.114"
@@ -1865,40 +1850,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "wasm-encoder"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "990065f2fe63003fe337b932cfb5e3b80e0b4d0f5ff650e6985b1048f62c8319"
-dependencies = [
- "leb128fmt",
- "wasmparser",
-]
-
-[[package]]
-name = "wasm-metadata"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb0e353e6a2fbdc176932bbaab493762eb1255a7900fe0fea1a2f96c296cc909"
-dependencies = [
- "anyhow",
- "indexmap",
- "wasm-encoder",
- "wasmparser",
-]
-
-[[package]]
-name = "wasmparser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
-dependencies = [
- "bitflags",
- "hashbrown 0.15.5",
- "indexmap",
- "semver",
-]
-
 [[package]]
 name = "web-sys"
 version = "0.3.91"
@@ -2005,15 +1956,6 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
-[[package]]
-name = "windows-sys"
-version = "0.59.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
-dependencies = [
- "windows-targets 0.52.6",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.60.2"
@@ -2166,88 +2108,6 @@ name = "wit-bindgen"
 version = "0.51.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
-dependencies = [
- "wit-bindgen-rust-macro",
-]
-
-[[package]]
-name = "wit-bindgen-core"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea61de684c3ea68cb082b7a88508a8b27fcc8b797d738bfc99a82facf1d752dc"
-dependencies = [
- "anyhow",
- "heck",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-bindgen-rust"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
-dependencies = [
- "anyhow",
- "heck",
- "indexmap",
- "prettyplease",
- "syn",
- "wasm-metadata",
- "wit-bindgen-core",
- "wit-component",
-]
-
-[[package]]
-name = "wit-bindgen-rust-macro"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
-dependencies = [
- "anyhow",
- "prettyplease",
- "proc-macro2",
- "quote",
- "syn",
- "wit-bindgen-core",
- "wit-bindgen-rust",
-]
-
-[[package]]
-name = "wit-component"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
-dependencies = [
- "anyhow",
- "bitflags",
- "indexmap",
- "log",
- "serde",
- "serde_derive",
- "serde_json",
- "wasm-encoder",
- "wasm-metadata",
- "wasmparser",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-parser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
-dependencies = [
- "anyhow",
- "id-arena",
- "indexmap",
- "log",
- "semver",
- "serde",
- "serde_derive",
- "serde_json",
- "unicode-xid",
- "wasmparser",
-]
 
 [[package]]
 name = "writeable"
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index a7b9ac5..999af60 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -1,5 +1,6 @@
 [workspace]
 members = [
+  "crabrl-fork",
   "fiscal-xbrl-core",
   "fiscal-xbrl-cli"
 ]
@@ -12,7 +13,9 @@ version = "0.1.0"
 
 [workspace.dependencies]
 anyhow = "1.0"
+compact_str = "0.8"
 once_cell = "1.21"
+quick-xml = "0.36"
 regex = "1.11"
 reqwest = { version = "0.12", default-features = false, features = ["blocking", "json", "rustls-tls"] }
 serde = { version = "1.0", features = ["derive"] }
diff --git a/rust/crabrl-fork b/rust/crabrl-fork
new file mode 160000
index 0000000..d1cf177
--- /dev/null
+++ b/rust/crabrl-fork
@@ -0,0 +1 @@
+Subproject commit d1cf177ee946093771e8bd161aa7a4d69cd0c171
diff --git a/rust/fiscal-xbrl-core/Cargo.toml b/rust/fiscal-xbrl-core/Cargo.toml
index 5781ca4..a9ed3a5 100644
--- a/rust/fiscal-xbrl-core/Cargo.toml
+++ b/rust/fiscal-xbrl-core/Cargo.toml
@@ -4,15 +4,14 @@ version.workspace = true
 edition.workspace = true
 license.workspace = true
 
-[features]
-default = []
-with-crabrl = ["dep:crabrl"]
-
 [dependencies]
 anyhow.workspace = true
+compact_str.workspace = true
 once_cell.workspace = true
+quick-xml.workspace = true
 regex.workspace = true
 reqwest.workspace = true
 serde.workspace = true
 serde_json.workspace = true
-crabrl = { path = "../vendor/crabrl", default-features = false, optional = true }
+
+crabrl = { path = "../crabrl-fork" }
diff --git a/rust/fiscal-xbrl-core/src/lib.rs b/rust/fiscal-xbrl-core/src/lib.rs
index f163946..65473cf 100644
--- a/rust/fiscal-xbrl-core/src/lib.rs
+++ b/rust/fiscal-xbrl-core/src/lib.rs
@@ -1,5 +1,7 @@
 use anyhow::{anyhow, Context, Result};
 use once_cell::sync::Lazy;
+use quick_xml::events::Event;
+use quick_xml::Reader;
 use regex::Regex;
 use reqwest::blocking::Client;
 use serde::{Deserialize, Serialize};
@@ -16,9 +18,6 @@ mod universal_income;
 
 use taxonomy_loader::{ComputationSpec, ComputedDefinition};
 
-#[cfg(feature = "with-crabrl")]
-use crabrl as _;
-
 pub const PARSER_ENGINE: &str = "fiscal-xbrl";
 pub const PARSER_VERSION: &str = env!("CARGO_PKG_VERSION");
 
@@ -1062,24 +1061,79 @@ fn validate_xbrl_structure(xml: &str, source_file: Option<&str>) -> XbrlValidati
         };
     }
 
-    if !xml.contains("<xbrl") && !xml.contains("<xbrli:xbrl") {
+    let mut reader = Reader::from_str(xml);
+    reader.config_mut().trim_text(true);
+
+    let mut has_xbrl_root = false;
+    let mut depth: i32 = 0;
+    let mut tag_stack: Vec<String> = Vec::new();
+    let mut buf = Vec::new();
+
+    loop {
+        match reader.read_event_into(&mut buf) {
+            Ok(Event::Start(e)) | Ok(Event::Empty(e)) => {
+                let name = String::from_utf8_lossy(e.name().as_ref()).to_string();
+
+                // Check for XBRL root element
+                if depth == 0 && (name == "xbrl" || name.ends_with(":xbrl")) {
+                    has_xbrl_root = true;
+                }
+
+                if matches!(reader.read_event_into(&mut buf), Ok(Event::Start(_))) {
+                    depth += 1;
+                    tag_stack.push(name);
+                }
+            }
+            Ok(Event::End(e)) => {
+                if depth > 0 {
+                    depth -= 1;
+                    let name = String::from_utf8_lossy(e.name().as_ref()).to_string();
+                    if let Some(expected) = tag_stack.pop() {
+                        if expected != name {
+                            return XbrlValidationResult {
+                                status: "warning".to_string(),
+                                message: Some(format!(
+                                    "Mismatched tags in {:?}: expected </{}>, found </{}>",
+                                    source_file.unwrap_or("unknown"),
+                                    expected,
+                                    name
+                                )),
+                            };
+                        }
+                    }
+                }
+            }
+            Ok(Event::Eof) => break,
+            Err(e) => {
+                return XbrlValidationResult {
+                    status: "warning".to_string(),
+                    message: Some(format!(
+                        "XML parse error in {:?} at byte {}: {}",
+                        source_file.unwrap_or("unknown"),
+                        reader.error_position(),
+                        e
+                    )),
+                };
+            }
+            _ => {}
+        }
+        buf.clear();
+    }
+
+    if !has_xbrl_root {
         return XbrlValidationResult {
             status: "error".to_string(),
             message: Some("Invalid XBRL: missing root element".to_string()),
         };
     }
 
-    let open_count = xml.matches('<').count();
-    let close_count = xml.matches('>').count();
-
-    if open_count != close_count {
+    if depth != 0 {
         return XbrlValidationResult {
             status: "warning".to_string(),
             message: Some(format!(
-                "Malformed XML detected in {:?} ({} open, {} close tags)",
+                "Unclosed tags in {:?}: {} unclosed element(s)",
                 source_file.unwrap_or("unknown"),
-                open_count,
-                close_count
+                depth
             )),
         };
     }
diff --git a/rust/fiscal-xbrl-core/src/surface_mapper.rs b/rust/fiscal-xbrl-core/src/surface_mapper.rs
index bf31af7..1f1c5eb 100644
--- a/rust/fiscal-xbrl-core/src/surface_mapper.rs
+++ b/rust/fiscal-xbrl-core/src/surface_mapper.rs
@@ -571,6 +571,7 @@ fn evaluate_formula_for_period(
     match formula.op {
         SurfaceFormulaOp::Sum => sum_formula_values(&values, formula.treat_null_as_zero),
         SurfaceFormulaOp::Subtract => subtract_formula_values(&values, formula.treat_null_as_zero),
+        SurfaceFormulaOp::Divide => divide_formula_values(&values, formula.treat_null_as_zero),
     }
 }
 
@@ -612,6 +613,33 @@ fn subtract_formula_values(values: &[Option<f64>], treat_null_as_zero: bool) ->
     Some(left - right)
 }
 
+fn divide_formula_values(values: &[Option<f64>], treat_null_as_zero: bool) -> Option<f64> {
+    if values.len() != 2 {
+        return None;
+    }
+
+    let left = if treat_null_as_zero {
+        values[0].unwrap_or(0.0)
+    } else {
+        values[0]?
+    };
+    let right = if treat_null_as_zero {
+        values[1].unwrap_or(0.0)
+    } else {
+        values[1]?
+    };
+
+    if right == 0.0 {
+        return None;
+    }
+
+    if !treat_null_as_zero && values.iter().all(|value| value.is_none()) {
+        return None;
+    }
+
+    Some(left / right)
+}
+
 pub fn merge_mapping_assignments(
     primary: &mut HashMap<String, MappingAssignment>,
     secondary: HashMap<String, MappingAssignment>,
@@ -831,6 +859,7 @@ fn transform_values(
                 period_id.clone(),
                 match sign_transform {
                     Some(SurfaceSignTransform::Invert) => value.map(|amount| -amount),
+                    Some(SurfaceSignTransform::Absolute) => value.map(|amount| amount.abs()),
                     None => *value,
                 },
             )
diff --git a/rust/fiscal-xbrl-core/src/taxonomy_loader.rs b/rust/fiscal-xbrl-core/src/taxonomy_loader.rs
index e2dc92c..d747ff6 100644
--- a/rust/fiscal-xbrl-core/src/taxonomy_loader.rs
+++ b/rust/fiscal-xbrl-core/src/taxonomy_loader.rs
@@ -15,6 +15,7 @@ fn default_include_in_output() -> bool {
 #[serde(rename_all = "snake_case")]
 pub enum SurfaceSignTransform {
     Invert,
+    Absolute,
 }
 
 #[derive(Debug, Deserialize, Clone)]
@@ -73,6 +74,7 @@ pub struct SurfaceFormula {
 pub enum SurfaceFormulaOp {
     Sum,
     Subtract,
+    Divide,
 }
 
 #[derive(Debug, Deserialize, Clone)]