diff --git a/src/data/manifest.xml b/src/data/manifest.xml
index 9bf7ace..6b74ba1 100644
--- a/src/data/manifest.xml
+++ b/src/data/manifest.xml
@@ -104,6 +104,15 @@
http://www.rddl.org/xhtml-symbol.ent
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+ http://www.w3.org/2000/09/xmldsig#
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+ http://www.w3.org/2009/xmldsig11#
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+ http://www.w3.org/2010/xmldsig2#
+
https://www.w3.org/1999/xlink.xsd
https://www.w3.org/1999/xlink
diff --git a/src/data/www.w3.org/2000/09/xmldsig-core-schema.xsd b/src/data/www.w3.org/2000/09/xmldsig-core-schema.xsd
new file mode 100644
index 0000000..d61f7ce
--- /dev/null
+++ b/src/data/www.w3.org/2000/09/xmldsig-core-schema.xsd
@@ -0,0 +1,318 @@
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diff --git a/src/data/www.w3.org/2009/xmldsig11-schema.xsd b/src/data/www.w3.org/2009/xmldsig11-schema.xsd
new file mode 100644
index 0000000..a07510a
--- /dev/null
+++ b/src/data/www.w3.org/2009/xmldsig11-schema.xsd
@@ -0,0 +1,144 @@
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diff --git a/src/data/www.w3.org/2010/xmldsig2-schema.xsd b/src/data/www.w3.org/2010/xmldsig2-schema.xsd
new file mode 100644
index 0000000..f55830d
--- /dev/null
+++ b/src/data/www.w3.org/2010/xmldsig2-schema.xsd
@@ -0,0 +1,65 @@
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