diff --git a/registry_tools/GEDCOM.io b/registry_tools/GEDCOM.io
index da76dfe9..45791f0a 160000
--- a/registry_tools/GEDCOM.io
+++ b/registry_tools/GEDCOM.io
@@ -1 +1 @@
-Subproject commit da76dfe933b22833035e005e7092ba1a91be0140
+Subproject commit 45791f0a61ae7375bca211019fdaeb12179c3925
diff --git a/structure/extension/_ATTR.yaml b/structure/extension/_ATTR.yaml
new file mode 100644
index 00000000..75150f0f
--- /dev/null
+++ b/structure/extension/_ATTR.yaml
@@ -0,0 +1,34 @@
+%YAML 1.2
+---
+lang: en-US
+
+type: structure
+
+uri: https://github.com/glamberson/gedcom-tags/_ATTR
+
+extension tags:
+  - _ATTR
+
+specification:
+  - Generic Attribute
+  - |
+    The _ATTR structure provides a generic mechanism for vendors to add
+    custom attributes to tags. The payload contains the attribute name,
+    and the required _VALUE substructure contains the attribute value.
+    
+    This allows software to extend tags with specific functionality
+    without requiring changes to the base specification.
+
+label: 'Attribute'
+
+payload: http://www.w3.org/2001/XMLSchema#string
+
+substructures:
+  "https://github.com/glamberson/gedcom-tags/_VALUE": "{1:1}"
+
+superstructures:
+  "https://github.com/glamberson/gedcom-tags/_TAG": "{0:M}"
+
+contact: "lamberson@yahoo.com"
+
+...
diff --git a/structure/extension/_COLOR.yaml b/structure/extension/_COLOR.yaml
new file mode 100644
index 00000000..94eff3dd
--- /dev/null
+++ b/structure/extension/_COLOR.yaml
@@ -0,0 +1,33 @@
+%YAML 1.2
+---
+lang: en-US
+
+type: structure
+
+uri: https://github.com/glamberson/gedcom-tags/_COLOR
+
+extension tags:
+  - _COLOR
+
+specification:
+  - Color
+  - |
+    The _COLOR structure specifies a color for visual representation of a tag.
+    The color must be specified as a 6-digit hexadecimal value in the format
+    #RRGGBB, where RR is red, GG is green, and BB is blue. Values are 
+    case-insensitive.
+    
+    Examples: #FF0000 (red), #00FF00 (green), #0000FF (blue)
+
+label: 'Color'
+
+payload: http://www.w3.org/2001/XMLSchema#string
+
+substructures: {}
+
+superstructures:
+  "https://github.com/glamberson/gedcom-tags/_TAG": "{0:1}"
+
+contact: "lamberson@yahoo.com"
+
+...
diff --git a/structure/extension/_TAG.yaml b/structure/extension/_TAG.yaml
new file mode 100644
index 00000000..df81d3da
--- /dev/null
+++ b/structure/extension/_TAG.yaml
@@ -0,0 +1,39 @@
+%YAML 1.2
+---
+lang: en-US
+
+type: record
+
+uri: https://github.com/glamberson/gedcom-tags/_TAG
+
+extension tags:
+  - _TAG
+
+specification:
+  - Tag Record
+  - |
+    A _TAG record represents an organizational tag that can be applied to
+    any record type for categorization purposes. Tags support optional
+    visual color coding and vendor-specific attributes through the 
+    generic _ATTR mechanism.
+    
+    Tags are first-class records that exist at the top level and are
+    referenced by other records using the _TAG substructure.
+
+label: 'Tag'
+
+payload: null
+
+substructures:
+  "https://gedcom.io/terms/v7/NAME": "{1:1}"
+  "https://github.com/glamberson/gedcom-tags/_COLOR": "{0:1}"
+  "https://github.com/glamberson/gedcom-tags/_ATTR": "{0:M}"
+  "https://gedcom.io/terms/v7/NOTE": "{0:M}"
+  "https://gedcom.io/terms/v7/SNOTE": "{0:M}"
+  "https://gedcom.io/terms/v7/CHAN": "{0:1}"
+
+superstructures: {}
+
+contact: "lamberson@yahoo.com"
+
+...
diff --git a/structure/extension/_TAG_ref.yaml b/structure/extension/_TAG_ref.yaml
new file mode 100644
index 00000000..e186f618
--- /dev/null
+++ b/structure/extension/_TAG_ref.yaml
@@ -0,0 +1,48 @@
+%YAML 1.2
+---
+lang: en-US
+
+type: structure
+
+uri: https://github.com/glamberson/gedcom-tags/_TAG_ref
+
+extension tags:
+  - _TAG
+
+specification:
+  - Tag Reference
+  - |
+    When used as a substructure, _TAG references a tag record to apply
+    that tag to the containing record. The payload is a pointer to a
+    _TAG record. Optional DATE and NOTE substructures can provide
+    context about when and why the tag was applied.
+
+label: 'Tag Reference'
+
+payload: "@<https://github.com/glamberson/gedcom-tags/_TAG>@"
+
+substructures:
+  "https://gedcom.io/terms/v7/DATE": "{0:1}"
+  "https://gedcom.io/terms/v7/NOTE": "{0:M}"
+
+superstructures:
+  "https://gedcom.io/terms/v7/record-INDI": "{0:M}"
+  "https://gedcom.io/terms/v7/record-FAM": "{0:M}"
+  "https://gedcom.io/terms/v7/record-SOUR": "{0:M}"
+  "https://gedcom.io/terms/v7/record-REPO": "{0:M}"
+  "https://gedcom.io/terms/v7/record-OBJE": "{0:M}"
+  "https://gedcom.io/terms/v7/record-NOTE": "{0:M}"
+  "https://gedcom.io/terms/v7/record-SNOTE": "{0:M}"
+  "https://gedcom.io/terms/v7/record-SUBM": "{0:M}"
+  "https://gedcom.io/terms/v7/EVEN": "{0:M}"
+  "https://gedcom.io/terms/v7/BIRT": "{0:M}"
+  "https://gedcom.io/terms/v7/DEAT": "{0:M}"
+  "https://gedcom.io/terms/v7/MARR": "{0:M}"
+  "https://gedcom.io/terms/v7/CENS": "{0:M}"
+  "https://gedcom.io/terms/v7/PLAC": "{0:M}"
+  "https://gedcom.io/terms/v7/NAME": "{0:M}"
+  "https://gedcom.io/terms/v7/ASSO": "{0:M}"
+
+contact: "lamberson@yahoo.com"
+
+...
diff --git a/structure/extension/_VALUE.yaml b/structure/extension/_VALUE.yaml
new file mode 100644
index 00000000..6a81d9b9
--- /dev/null
+++ b/structure/extension/_VALUE.yaml
@@ -0,0 +1,30 @@
+%YAML 1.2
+---
+lang: en-US
+
+type: structure
+
+uri: https://github.com/glamberson/gedcom-tags/_VALUE
+
+extension tags:
+  - _VALUE
+
+specification:
+  - Attribute Value
+  - |
+    The _VALUE structure contains the value for a generic attribute
+    defined by _ATTR. The value is a string that can contain any
+    vendor-specific data.
+
+label: 'Value'
+
+payload: http://www.w3.org/2001/XMLSchema#string
+
+substructures: {}
+
+superstructures:
+  "https://github.com/glamberson/gedcom-tags/_ATTR": "{1:1}"
+
+contact: "lamberson@yahoo.com"
+
+...