This file is indexed.

/usr/share/xml/dia/sheet.dtd is in dia-common 0.97.3+git20160930-8.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!ELEMENT sheet (name, description*, contents) >
<!ATTLIST sheet
  xmlns CDATA #FIXED 'http://www.lysator.liu.se/~alla/dia/dia-sheet-ns' >

<!ELEMENT name (#PCDATA)* >

<!ELEMENT description (#PCDATA)* >
<!ATTLIST description
  xml:lang NMTOKEN #IMPLIED 'C' >

<!ELEMENT alias (#PCDATA)* >
<!ATTLIST alias
  name CDATA #REQUIRED >

<!ELEMENT contents (object | shape | br)* >

<!ELEMENT object (description | alias)* >
<!ATTLIST object
  name CDATA #REQUIRED
  intdata CDATA #IMPLIED >

<!ELEMENT shape (description)* >
<!ATTLIST shape
  name CDATA #REQUIRED >

<!ELEMENT br EMPTY>