RE: Flat XML: Problem getting children

We had someone else ask this a couple of days ago: the problem is called
"positional grouping" and you'll find a lot of material by googling on that.

There are broadly three approaches:

(a) in XSLT 2.0, use xsl:for-each-group group-starting-with=pattern

(b) handle it in the same way as value-based grouping (ie Muenchian grouping
using keys, but with a carefully-crafted grouping key: in this case
something like generate-id(self::NT|preceding-sibling::NT[1])

(c) recurse over the logical tree using xsl:apply-templates; on each
iteration instead of selecting the physical children, you select the logical
children, which are the following siblings that have the current record as
the most recent logical parent: something like apply-templates
select="following-sibling::*[generate-id(preceding-sibling::NT[1]) =
generate-id(current())]".

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: Jacqui Moore [mailto:jacquimoore1@xxxxxxxxxxx]
> Sent: 07 October 2004 17:27
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Flat XML: Problem getting children
>
> I have an xml file that has the following structure:
>
> <thesaurus>
> <concept>
> <descriptor>House</descriptor>
> <NT>Rooms</NT>
> <NT>Roofs</NT>
> <SN>All About houses</SN>
> </concept>
> <concept>
> <descriptor>Rooms</descriptor>
> <BT>House</BT>
> <NT>Lounge</NT>
> <NT>Kitchen</NT>
> <SN>We have rooms in houses</SN>
> </concept>
> <concept>
> <descriptor> Lounge </descriptor>
> <BT> Rooms </BT>
> <SN>Lounges are nice places</SN>
> </concept>
> <concept>
> <descriptor> Roofs </descriptor>
> <BT>House</BT>
> <NT>Kitchen</NT>
> <SN>Roofs go on houses</SN>
> </concept>
> <concept>
> <descriptor> Utensils </descriptor>
> <BT>Kitchen</BT>
> <SN>Utensils belong in the draw</SN>
> </concept>
>
> </thesaurus>
>
> NT - the children categories
> BT - the parent category
>
> The objective is to create a expandable client side tree
> structure, and the
> user will click on a category and the category information
> (SN) will be
> displayed in the right frame.
>
> - HOUSE
>    - Rooms
>        o Lounge
>        o Kitchen
>             ' Utensils
>    - Roofs
>        o Kitchen
>            ' Utensils
>
> I can get the top level categories:
> <xsl:for-each select="thesaurus/concept[boolean(BT)=false]">
>
> My problem is I do not know how to get the children and their
> children etc.
> (loop until the concept has no NT element) . There is no
> limit to the number
> of children levels and a child can appear in more than one
> parent. I think I
> need to use a key but am not having ANY success.
>
> Thanks in advance!!
>
> Jacqui