:symbol-seq: icon:list[title=Sequence]
:symbol-ref: icon:arrow-up-right-from-square[title=Reference]
:symbol-obj: icon:cube[title=Object]
:symbol-deftype: icon:shapes[title=Defined type]
:symbol-backref: icon:share-from-square[title=Reference,flip=horizontal]
:symbol-key: icon:key[title=Key]
:symbol-computed: icon:cogs[title=Computed]

== Symbols legend

Some icons are used in the tables of this page for symbolic representations of
xref:db:concepts.adoc#advanced[advanced data types]:

[no-bullet]
- {symbol-ref} xref:db:concepts.adoc#reference[*reference*]
- {symbol-obj} xref:db:concepts.adoc#object[*object*]
- {symbol-deftype} xref:db:concepts.adoc#deftype[*defined types*]
- {symbol-backref} xref:db:concepts.adoc#backref[*back reference*]

Other symbols are used for xref:db:concepts.adoc#attributes[attributes] of
properties:

[no-bullet]
- {symbol-seq} xref:db:concepts.adoc#sequence[*sequence*]
- {symbol-key} xref:db:concepts.adoc#key[*key*]
- {symbol-computed} xref:db:concepts.adoc#computed[*computed*]

The optional/required attribute is indicated in the _Required_ column of
properties definition table. When defined, the default value attribute is
mentioned in the _Description_ column.
