Clarify text.

Alternatively, a batch upsert with ["replace"]{.HTML-Code} update mode can be

used, as described in Clause+++clause-10+++10.3.3.

The following names should be avoided when defining Entity Types, as definitions

already exist within the Core _`@context`_, and are used for the operations of

NGSI-LD API itself:

The following names shall be avoided when defining Entity Types, as definitions

already exist within the core _`@context`_, and are reserved for use as data

types within the NGSI-LD Core API itself:

- ["Attribute"]{.HTML-Code}, ["AttributeList"]{.HTML-Code} ,

  ["ContextSourceIdentity"]{.HTML-Code} ,

  ["Subscription"]{.HTML-Code}, ["TemporalProperty"]{.HTML-Code},

  ["VocabProperty"]{.HTML-Code}

The following names are defined in in the Core _`@context`_ using their standard

The following names are defined in the core _`@context`_ using their standard

GeoJSON-LD definitions [i.13], and reserved for use in geographic operations:

- ["Feature"]{.HTML-Code}, ["FeatureCollection"]{.HTML-Code},

  ["MultiLineString"]{.HTML-Code}, ["MultiPoint"]{.HTML-Code} ,

  ["MultiPolygon"]{.HTML-Code}, ["Point"]{.HTML-Code}, ["Polygon"]{.HTML-Code}

The following names are defined in in the Core _`@context`_ and are reserved for

The following names are defined in the Core _`@context`_ and are reserved for

temporal definitions:

- ["Date"]{.HTML-Code}, ["DateTime"]{.HTML-Code}, ["Time"]{.HTML-Code}