Common subschema elements

The following elements are used to define the grammar of the subschema attribute values:

• alpha = 'a' - 'z', 'A' - 'Z'
• number = '0' - '9'
• anh = alpha / number / '-' / ';'
• anhstring = 1 * anh
• keystring = alpha [ anhstring ]
• numericstring = 1 * number
• oid = descr / numericoid
• descr = keystring
• numericoid = numericstring *( "." numericstring )
• woid = whsp oid whsp ; set of oids of either form (numeric OIDs or names)
• oids = woid / ( "(" oidlist ")" )
• oidlist = woid *( "$" woid ) ; object descriptors used as schema element names
• qdescrs = qdescr / ( whsp "(" qdescrlist ")" whsp )
• qdescrlist = [ qdescr *( qdescr ) ]
• whsp "'" descr "'" whsp