Note that in case you need to print the document, the summary has a numbered heading.

To prevent this issue, you may choose to not show the title and have the Description and the Summary section collapsed. Printing is then no issue since there is no heading.

Suppose you need to extract the sections Space Relation, Providing Spaces, and Collaboration Spaces to their own documents. This way you may have easier content reuse, you may collaborate easier if each content is created by another author, any you may reference the individual sections easier if they have their own unique URL.

Let's use the Section Doctype to create a document for each of the three sections we extract and the Transclude Documents Macro to integrate them with the original document.

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A section document looks like this:

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To create the same heading number in the section documents as shown in the transcluding document, you need to set the number start (heading-number-start) to 1

and

switch on the numbering of the document title (set use-document-heading-number to true).

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Now the section headings align with the numbers shown in the transcluding document.

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If you have a dedicated space for your specification or software architecture document, option 1 may be easier to use. Mind unwanted numbering on standard pages, but otherwise you would not need to configure the section pages with an additional HTML Macro.

for each transcluding document, which is not possible for the same document.

h1#title-text:before {  
   counter-increment: h1;  
   content: counter(h1) " ";  
}

h1#title-text:before {  
counter-reset: h1 !important;
counter-increment: none !important;
content: "" !important;
}