inst.xml:5: namespace warning : xmlns: URI some_ns is not absolute
<SomeObject xmlns="some_ns">
                           ^
<?xml version="1.0"?>
<!DOCTYPE dtd [
<!ENTITY file SYSTEM "some_file">
]>
<SomeObject xmlns="some_ns">
  <d>2013-07-15T20:21:43.476838</d>
  <i>5</i>
  <s>&file;</s>
</SomeObject>
inst.xml:8: element s: Schemas validity error : Internal error: xmlSchemaVDocWalk, there is at least one entity reference in the node-tree currently being validated. Processing of entities with this XML Schema processor is not supported (yet). Please substitute entities before validation..
inst.xml validation generated an internal error
