3.5.3 Contents of Core Properties in an EPC File

For an EPC file, the Core Properties part should contain:

• creator (mandatory). Free text.
• created (mandatory). This field must correspond to the package creation time, given in the W3CDTF format.
• version (mandatory). The EPC specification version that the package is based on (currently 1.0).
• description (optional). Free text.
• identifier (optional). URN with UUID.

• See http://www.ietf.org/rfc/rfc2141.txt

• Example : urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6

• keywords (optional). Free keyword.

• If various keywords are given in one unique string (possibly caused by the mixed attribute being set to "true" in the complex type “CT_Keywords”), then it is assumed that the delimiter between keywords is a semicolon. In this situation, trailing and leading spaces are not allowed between the key words.

• title (optional). Free text.

• All other core properties specified in OPC are assumed NOT to be given.