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RE: XPath 1.5? (was RE: typing and markup)

• To: clbullar@i..., xml-dev@l...
• Subject: RE: XPath 1.5? (was RE: typing and markup)
• From: "Wayne Steele" <xmlmaster@h...>
• Date: Tue, 07 May 2002 14:09:36 -0700
• Bcc:

I think you could have picked less obvious vendors if you wanted to.

Don't forget "Boolean" (from memory):

System 1: Not supported as a column, 3-state support as a variable
System 2: Not supported as a column, 3-state support as a variable

XML Schema still doesn't tell you the best way to map XSD types into your 
database. You still have a lot of work ahead of you. But I think you know 
that.

-Wayne Steele


>From: "Bullard, Claude L (Len)" <clbullar@i...>
>To: 'Jonathan Robie' <jonathan.robie@d...>, "Simon 
>St.Laurent" <simonstl@s...>, xml-dev@l...
>Subject: RE:  XPath 1.5? (was RE:  typing and markup)
>Date: Tue, 7 May 2002 14:46:04 -0500
>
>Just for discussion, here are two *hypothetical*
>database systems with a listing of corresponding
>datatypes.  (no they are real but let's not get
>into the vendors).   Both of these can issue and
>accept XML.   Without a way to spec datatypes,
>just how good are my chances that the db will
>handle the data not as I see fit, but such that
>regardless of the db, I or anyone that uses the
>XML, will get the same results.
>
>Doesn't this become an issue for anyone who
>tries to spec a common XML document type
>for say, ebXML?  Are elements and attribute
>names sufficient?  Today, we have to write
>a lot of code to handle this.  I don't think
>that is a good solution for interop.
>
>len
>
>***************************************************************************
>
>Fixed Length String
>
>System 1:  CHAR(n)- limit 2KB
>System 2:  CHAR(n), CHARACTER(n)- limit 255 (6.5)- limit 8KB (7.0)
>
>Variable Length String
>
>System 1:  VARCHAR2(n), VARCHAR(n)- limit 4KB in a column- limit 32KB in a 
>variable- VARCHAR is obsolete
>System 2:  VARCHAR(n), CHAR VARYING(n), CHARACTER VARYING(n)- limit 255 
>(6.5)- limit 8KB (7.0)
>
>Integer
>
>System 1:  INTEGER, INTEGER(n), SMALLINT
>System 2:  INTEGER (4 bytes), INT (4 bytes), SMALLINT (2 bytes), TINYINT (1 
>byte), BIT (1 bit)
>
>Fixed Point
>
>System 1:  NUMBER, NUMBER(n), NUMBER(n,d),FLOAT, FLOAT(n), FLOAT(n,d)
>System 2:  NUMERIC, NUMERIC(n), NUMERIC(n,d),DECIMAL, DECIMAL(n), 
>DECIMAL(n,d),DEC, DEC(n), DEC(n,d),MONEY, SMALLMONEY
>
>Floating Point
>
>System 1:  DECIMAL
>System 2:  FLOAT, FLOAT(n), DOUBLE PRECISION, REAL,
>
>Date
>
>System 1:  DATE
>System 2:  DATETIME, SMALLDATETIME, TIMESTAMP- TIMESTAMP auto-updated
>
>Binary
>
>System 1:  RAW(n)- limit 255 bytes
>System 2:  BINARY(n), VARBINARY(n), BINARY VARYING(n)- limit 255 (6.5)- 
>limit 8KB (7.0)
>
>Large String
>
>System 1:  LONG, LONG VARCHAR- limit 2GB- limit one per table rowCLOB- 
>limit 4GB
>System 2:  TEXT- limit 2GB
>
>Large Binary
>
>System 1:  LONG RAW- limit 2GB- limit one per table rowBLOB- limit 4GB
>System 2:  IMAGE- limit 2GB
>
>Multi-byte chars
>
>System 1:  NCHAR(n)NVARCHAR(n)NCLOB- same limits as CHAR, VARCHAR, CLOB
>System 2:  NCHAR(n), NATIONAL CHAR(n), NATIONAL CHARACTER(n)NVARCHAR(n), 
>NATIONAL CHAR VARYING(n), NATIONAL CHARACTER VARYING(n)NTEXT, NATIONAL 
>TEXT- same limits as CHAR, VARCHAR, TEXT
>
>Row Identifier
>
>System 1:  implicit ROWID column
>System 2:  (use an IDENTITY column)
>
>Secure OS Label
>
>System 1:  MLSLABEL, RAW MLSLABEL
>System 2:  <not supported>
>
>128-bit Unique Number(UUID, GUID)
>
>System 1:  <not supported>
>System 2:  UNIQUEIDENTIFIER (version 7.0 only)
>
>
>From: Jonathan Robie [mailto:jonathan.robie@d...]
>
>I don't know how to design a language that will avoid any possible
>philosophical or aesthetic objections on XML-Dev. I'm an engineer, not a
>deity. But if you give me a concrete problem to solve, I think we have a
>Working Group that might be able to solve it.
>
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