diff --git a/schema/lib/types/crossplatform.xsd b/schema/lib/types/crossplatform.xsd
new file mode 100644
index 0000000..2e76da0
--- /dev/null
+++ b/schema/lib/types/crossplatform.xsd
@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           elementFormDefault="qualified"
+           attributeFormDefault="unqualified">
+
+  <xs:include schemaLocation="./linux.xsd"/>
+  <xs:include schemaLocation="./windows.xsd"/>
+
+  <!-- ABSOLUTE directory path -->
+  <xs:simpleType name="t_xplat_dirpath">
+    <xs:union memberTypes="t_linux_dirpath t_windows_dirpath"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE directory path -->
+  <xs:simpleType name="t_xplat_reldirpath">
+    <xs:union memberTypes="t_linux_reldirpath t_windows_reldirpath"/>
+  </xs:simpleType>
+
+  <!-- ABSOLUTE file path -->
+  <xs:simpleType name="t_xplat_filepath">
+    <xs:union memberTypes="t_linux_filepath t_windows_filepath"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE file path -->
+  <xs:simpleType name="t_xplat_relfilepath">
+    <xs:union memberTypes="t_linux_relfilepath t_windows_relfilepath"/>
+  </xs:simpleType>
+
+  <!-- ABSOLUTE path (file or directory) -->
+  <xs:simpleType name="t_xplat_path">
+    <xs:union memberTypes="t_linux_path t_windows_path"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE path (file or directory) -->
+  <xs:simpleType name="t_xplat_relpath">
+    <xs:union memberTypes="t_linux_relpath t_windows_relpath"/>
+  </xs:simpleType>
+
+  <!-- ANY valid value for the above types. -->
+  <xs:simpleType name="t_xplat_anypath">
+    <xs:union memberTypes="t_linux_anypath t_windows_anypath"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE or ABSOLUTE file path -->
+  <xs:simpleType name="t_xplat_anyfile">
+    <xs:union memberTypes="t_linux_anyfile t_windows_anyfile"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE or ABSOLUTE dir path -->
+  <xs:simpleType name="t_xplat_anydir">
+    <xs:union memberTypes="t_linux_anydir t_windows_anydir"/>
+  </xs:simpleType>
+
+</xs:schema
diff --git a/schema/lib/types/windows.xsd b/schema/lib/types/windows.xsd
new file mode 100644
index 0000000..261dad1
--- /dev/null
+++ b/schema/lib/types/windows.xsd
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           elementFormDefault="qualified"
+           attributeFormDefault="unqualified">
+
+  <xs:include schemaLocation="./std.xsd"/>
+
+  <!-- ABSOLUTE directory path -->
+  <!-- Getting this regex right for Windows is a nightmare. This is just intended to check in a very basic manner. -->
+  <xs:simpleType name="t_windows_dirpath">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="\s*(~|[A-Za-z]+:)(\\[^\\]*)+\\?\s*"/>
+      <xs:whiteSpace value="collapse"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- RELATIVE directory path -->
+  <!-- Don't trust this. XML patterns don't support lookahead/lookbehind, so we can't negate a char sequence. -->
+  <xs:simpleType name="t_windows_reldirpath">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="\s*[^\\](([^\\]*)+\\?)+\s*"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- ABSOLUTE file path -->
+  <xs:simpleType name="t_windows_filepath">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="\s*(~|[A-Za-z]+:)?(\\[^\\]+)+\s*"/>
+      <xs:whiteSpace value="collapse"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- RELATIVE file path -->
+  <xs:simpleType name="t_windows_relfilepath">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="\s*([^\\]+)(\\[^\\]+)*([^\\])*\s*"/>
+      <xs:whiteSpace value="collapse"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- ABSOLUTE path (file or directory) -->
+  <xs:simpleType name="t_windows_path">
+    <xs:union memberTypes="t_windows_dirpath t_windows_filepath"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE path (file or directory) -->
+  <xs:simpleType name="t_windows_relpath">
+    <xs:union memberTypes="t_windows_reldirpath t_windows_relfilepath"/>
+  </xs:simpleType>
+
+  <!-- ANY valid value for the above types. -->
+  <xs:simpleType name="t_windows_anypath">
+    <xs:union memberTypes="t_windows_path t_windows_relpath"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE or ABSOLUTE file path -->
+  <xs:simpleType name="t_windows_anyfile">
+    <xs:union memberTypes="t_windows_filepath t_windows_relfilepath"/>
+  </xs:simpleType>
+
+  <!-- RELATIVE or ABSOLUTE dir path -->
+  <xs:simpleType name="t_windows_anydir">
+    <xs:union memberTypes="t_windows_dirpath t_windows_reldirpath"/>
+  </xs:simpleType>
+
+</xs:schema>