doc: Add initial paragraph

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diff --git a/doc/src/02010-linking.md b/doc/src/02010-linking.md
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 ## Linking from an store entry {#sec:thestore:linking}
 
+In @sec:thestore:fileformat:header:imag it was already defined that there MUST
+BE a section "imag" in the header. This section can be used to link to
+"internal" and "external" content, whereas "internal content" refers to entries
+which are stored in the very same store as the entry which links.
+The term "external content" means content which is not stored in the
+store, but elsewhere on the filesystem or the network (thus, an URL is valid
+external content).
+
+Entries can be referenced from the content part. For example, if the content
+part is written in Markdown, the user is able to link content within the
+Markdown text.
+These links could be either links to internal content or external content.
+
 ### Linking to internal content {#sec:thestore:linking:internal}
 
 ### Linking to external content {#sec:thestore:linking:external}