SECTION A $($Answer any $6$ Questions, $1$ mark each$)$

$[6$ mark$]$

Q$1.$ Define "equivalent class". Write OWL code to define that "flat" and 'apartment' are equivalent classes.

Q$2.$ Using OWL code, define an enumerated class "car$-$color" which is a subclass of 'color' and have fixed individuals "black', 'white', 'red', and 'blue'.

Q$3.$ Class 'child' is a disjoint union of the class boy and class girl. Where boy and girl classes are pairwise disjoint. Represent the above information using OWL$2$ construct.

Q$4.$ Define property chain inclusion with example using OWL$2$ construct.

Q$5.$ Write an SRS query to get the "documents from swissprot that contain 'adrenergic' and 'receptor' in the 'description'$-$field, but not 'alpha$1$ A$".$

Q$6.$ Write the OWL code to represent that 'Roll$-$No$\text{'}$ and 'Student$-$Id$\text{'}$ are equivalent properties.

Q$7.$ Unfold the given T$-$Box.

Male $=>$not Female

Man $=>$ Person $$ Male

Woman $=>$ Person $$ Female

Mother $=>$ Woman $EE$ has$-$child.Human

Father $=>$ Man $EE$ has$-$child.Human

Parent $=>$ Mother $$ Father