Purpose of generate-id index [1]

>Date: Tue, 24 Jun 2003 12:48:38 -0500
>From: John Sharp <jsharp@xxxxxx>
>Organization: Texas Instruments
>To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>Subject: Purpose of generate-id index [1]
>
>Hello, I have been successfully using the generate-id() function
>with a key, without fully understanding the purpose of the [1]
>index construct.
>
>One explanation is given - "Given a node-set, generate-id
>returns an ID for the node in the node-set that occurs first
>in document order" (O'Reilly XSLT)
>
>e.g.
>/TDLfile[generate-id(.)=generate-id(
>          key('TimingByGroup',concat(@type,'::',@period))[1])]
>
>In general terms why is the [1] index present.
>
>BTW, as I'm on the digest list, a CC courtesy copy would be
>appreciated.
>
>Kind regards,
>John.
>--
> Texas Instruments Inc  Product Development    tel:214 480 4253
> PO BOX 660199          MS: 8645 FORE/A-3101   fax:214 480 4401
> 12500 TI Boulevard     Dallas, TX 75266-0199      
>     nawk nawk,  Who's there ?   Aho, Weinberger and Kerninghan.



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