what is this

i dont think so

<!ENTITY % plistObject "(array | data | date | dict | real | integer | string | true | false )" >

<!ELEMENT plist %plistObject;>

<!ATTLIST plist version CDATA "1.0" >

<!-- Collections -->

<!ELEMENT array (%plistObject;)*>

<!ELEMENT dict (key, %plistObject;)*>

<!ELEMENT key (#PCDATA)>

<!--- Primitive types -->

<!ELEMENT string (#PCDATA)>

<!ELEMENT data (#PCDATA)> <!-- Contents interpreted as Base-64 encoded -->

<!ELEMENT date (#PCDATA)> <!-- Contents should conform to a subset of ISO 8601 (in particular, YYYY '-' MM '-' DD 'T' HH ':' MM ':' SS 'Z'. Smaller units may be omitted with a loss of precision) -->

<!-- Numerical primitives -->

<!ELEMENT true EMPTY> <!-- Boolean constant true -->

<!ELEMENT false EMPTY> <!-- Boolean constant false -->

<!ELEMENT real (#PCDATA)> <!-- Contents should represent a floating point number matching ("+" | "-")? d+ ("."d*)? ("E" ("+" | "-") d+)? where d is a digit 0-9. -->

<!ELEMENT integer (#PCDATA)> <!-- Contents should represent a (possibly signed) integer number in base 10 -->

Code for what ? I'm sorry I'm not understanding

It was in a crash report