cmake set_package_properties(XML) examples

KDAB/KDStateMachineEditor CMakeLists.txt :162 

set_package_properties(
    Qt5XmlPatterns PROPERTIES
    TYPE OPTIONAL
    DESCRIPTION "Qt5 XmlPatterns library"
    PURPOSE "Required with Qt5 for unit tests dealing with XML input/output"
)

libical/libical CMakeLists.txt :656 

set_package_properties(
  LibXML
  PROPERTIES
    TYPE
      OPTIONAL
    DESCRIPTION
      "a library providing XML and HTML support"
    URL
      "http://xmlsoft.org"
    PURPOSE
      "For the optional libical-glib interface"
)