Enhanced Schema for MARCXML

Based on the official MARC 21 XML Schema, this schema adds some additional elements to support error handling and fixed-length field decoding.

Fixed-length Field Decoding

This scheme includes elements for use in controlfield elements that can be used for decoding the fixed-length field positions into human-readable values.

<controlfield tag="008">
  <encoded>071120s15310406gw a          000 0 lat d</encoded>
  <decoded>
    <field position="00-05" type="Date entered on file">2007-11-20</field>
    <field position="06-14" type="Dates">
      <desc code="s">Single known date/probable date</desc>
      <dated when="1531">1531</dated>
    </field>
    <field position="15-17" type="Place of publication, production, or execution">Germany</field>
    <field position="18-21" type="Illustrations">
      <item>Illustrations</item>
    </field>
    <field position="22" type="Target audience">No attempt to code</field>
    <field position="23" type="Form of item">No attempt to code</field>
    <field position="24-27" type="Nature of contents">No attempt to code</field>
    <field position="28" type="Government publication">No attempt to code</field>
    <field position="29" type="Conference publication">Not a conference publication</field>
    <field position="30" type="Festschrift">Not a festschrift</field>
    <field position="31" type="Index">No index</field>
    <field position="33" type="Literary form">Not fiction (not further specified)</field>
    <field position="34" type="Biography">No attempt to code</field>
    <field position="35-37" type="Language">Latin</field>
    <field position="38" type="Modified record">No attempt to code</field>
    <field position="39" type="Cataloging source">Other</field>
  </decoded>
</controlfield>

Element	<encoded>
Purpose	Contains the raw value of the control field.
Attributes	None
May contain	Empty element

Element	<decoded>
Purpose	Wrapper for the decoded value of the positions withing a fixed-length control field.
Attributes	None
May contain	<field>

Element	<field>
Purpose	Contains the human-readable translations of the position indicated.
Attributes	@position, @type
May contain	List: <item> Dates: <dated>, <desc>

Element	<item>
Purpose	When the position contains a list of values, each value is wrapped in this element.
Attributes	None
May contain	Empty element

Element	<dated>
Purpose	Exclusively for use with Date1/Date2 positions, contains a human-readable date label.
Attributes	@when, @from, @to
May contain	Empty element
Note	Attributes @from and @to are paired together when a range is denoted, otherwise @when is used for a single year or detailed date.

Element	<desc>
Purpose	Exclusively for use with Type of Date position, contains the human-readable value of position.
Attributes	@code
May contain	Empty element

Error Handling

This scheme includes an <error> element that can be used to record data quality issues or other errors that were encountered when generating the MARCXML record from a MARC BLOB.

<errors>
  <error tag="008">Review the encoded date (06-14)</error>
</errors>

Element	<errors>
Purpose	Wrapper for <error> elements.
Attributes	None
May contain	<error>

Element	<error>
Purpose	Record data quality issues with the MARC record that were encounter during validation.
Attributes	@tag, @subfield, @indicator
May contain	Empty element