birdnotes.py: Objects to represent bird note files

This method adds loc-group content to an XML parent node.

# - - -   L o c G r o u p . w r i t e N o d e

    def writeNode(self, node):
        """Add loc-group content to node.
        """

The loc and gps attributes are optional; add them only if they are not None.

        #-- 1 --
        # [ if self.locCode ->
        #     node  :=  node with an rnc.LOC_A attribute added
        #               from self.locCode
        #   else -> I ]
        if  self.loc:
            node.attrib[rnc.LOC_A] = self.loc.code

        #-- 2 --
        # [ if self.gps ->
        #     node  :=  node with an rnc.GPS_A attribute added
        #               from self.gps
        #   else -> I ]
        if  self.gps:
            node.attrib[rnc.GPS_A] = self.gps

The loc-detail content is a child element, not an attribute. The .locDetail attribute is a Narrative instance. For the method that adds the narrative content, see Section 18.6, “Narrative.writeNode(): Write as XML”.

        #-- 3 --
        # [ if  self.locDetail ->
        #     node  :=  node with a new child rnc.LOC_DETAIL_N
        #               node added made from self.locDetail ]
        if  self.locDetail:
            detail = et.SubElement(node, rnc.LOC_DETAIL_N)
            self.locDetail.writeNode(detail)