Attach a new XBRLDocument to the instance document using
a linkbaseRef or schemaRed only if the document
is not in already in the set of documents that can be discovered from
this instance document existing DTS entries.
ALWAYS_ADD_ref_2006_02_27_xsd_SCHEMA_TO_DTS is defined as "http://www.reportingstandard.com/properties/always_add_ref_2006_02_27_schema_to_DTS"
Possible value is a string that can be converted into a boolean "true" or "false"
Default value is "false"
Some taxonomies does not incorporate the URL of the reference schema http://www.xbrl.org/2006/ref-2006-02-27.xsd to the DTS but use its namespace in the
reference linkbase instead.
This class is abstract and serves for XBRL defined objects to remove from
the declared attributes in the node all that belongs to a different layer
as for example the XML Schema layer or the XLink layer.